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Automobile guide rail is part of automobile door assembly, which belongs to the part of automobile door sealing system. Door guide is installed in the inner cavity of the car door, mainly playing a role in guiding the glass to ensure that the door glass runs up and down according to the designed trajectory. The guide groove in the door guide is usually made of elastomer material such as EPDM or PVC, which reduces the running resistance and noise and absorbs the vibration of the glass during the up and down movement. The shape of the guide rail is usually T-shaped, U-shaped, etc. According to the different shapes, it can be divided into two forms: metal guide rail and injection guide rail. Metal guides are heavier but stronger, while injection guides are lighter but weaker. The longitudinal grooves or ridges on the surface of the guideway are used to guide and fix machine parts, special equipment, instruments, etc. They have a higher load rating than linear bearings, and at the same time can bear a certain amount of torque, which allows for high-precision linear motion under high load conditions.