Automatic transmission friction packs are a component of an automatic transmission that plays a key role in transmitting torque between the various components of the transmission.
Structure and operating principle:
Friction packs consist of a series of alternating metal discs (steel plates) and discs of friction material. Discs with friction material have a special coating that allows them to transmit torque between metal discs when friction occurs between them.
When the automatic transmission solenoid valve is turned on, it directs hydraulic fluid under pressure to the clutch pack. The fluid causes the friction material discs to be pressed between the metal discs, creating friction. This friction transfers torque between two transmission elements (for example, between a planetary gear and a shaft) and allows the automatic transmission to change gears.
Types of friction packs:
There are several types of friction packs that are used in automatic transmissions:
*Single-Way Packs: These packs only have one set of friction discs and they only transmit torque in one direction.
* Reversible Packs: These packs have two sets of friction discs, allowing them to transmit torque in both directions.
* Planetary packages: These packages are located around the planetary gear and are used to change the gear ratio in the automatic transmission.
Functions:
Friction packs perform the following functions in an automatic transmission:
*Transmission of torque between various transmission elements
* Gear shift
* Ensuring smooth gear changes
* Absorption of vibrations and shocks in the transmission
Maintenance:
Friction packs are wear components and over time they can wear out and require replacement. Signs of worn friction packs can include transmission slipping, delayed shifting, and transmission fluid leaks. Regular maintenance and replacement of worn friction packs are important to ensure proper operation of the automatic transmission and extend its service life.