Automobile gearbox oil seals are usually made of the following materials:

1. Rubber: Rubber is one of the most common oil seal materials for gearbox, which has good elasticity and sealing performance. Rubber oil seals are usually made of Ding Qing rubber (NBR), fluororubber (FKM) or propylene rubber (ACM), which can withstand high temperature and chemical corrosion, and are suitable for automobile gearbox under different working conditions.

2. Polyurethane: Polyurethane oil seal has high wear resistance and durability, and is suitable for high-load and high-speed working environment. Polyurethane gearbox oil seal is usually used in the transmission of commercial vehicles or heavy vehicles.

3. Metal: Metal bellows oil seal is usually composed of metal shell and rubber sealing ring, which has high wear resistance and corrosion resistance. Metal bellows oil seal is suitable for high temperature and high pressure working environment, which can effectively prevent lubricating oil leakage.

4. Polytetrafluoroethylene (PTFE): PTFE is a material with excellent high temperature resistance, corrosion resistance and low friction coefficient, which is often used in the oil seal of high-performance automobile gearbox. PTFE gearbox oil seal has a long service life and stable sealing performance, which is suitable for the transmission of high-performance vehicles.

To sum up, the materials of automobile gearbox oil seal mainly include rubber, polyurethane, metal and PTFE, etc. Different materials of gearbox oil seal are suitable for different working environments and vehicle types. The gearbox oil seal with suitable material can ensure the normal operation of the transmission, prolong the service life of the gearbox and improve the reliability and safety of the vehicle.