The bevel gears in automobile transmissions usually refer to bevel
gears, which are mainly used in differentials in transmissions.
Bevel gears are gears capable of transmitting power between
intersecting axes. Their teeth have a conical shape, which allows
them to transmit power between two axes, one of which is
perpendicular to the other.
In a car's differential, bevel gears are used to transmit the
engine's power to the driving wheels, while allowing the driving
wheels to rotate at different speeds when turning, thereby
achieving steering of the vehicle. The bevel gears in the
differential usually include two bevel gears, connecting the drive
shaft and the drive wheel shaft respectively. The precision with
which these gears are designed and manufactured is critical to
ensuring a smooth ride and good handling.
In addition to differentials, other types of gears may also be used
in transmissions, such as spur gears, helical gears, and planetary
gears. These gears are used to achieve different transmission
ratios to adapt to different driving conditions. Transmission
design will select the appropriate gear type based on the specific
needs and operating principles of the vehicle.