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Automatic Transmission Bands
The lining absorbs transmission fluid to aid in heat dissipation. As the band tightens around the drum, the fluid is squeezed out into grooves cut into the band's surface. The band brings the drum to a stop and holds it there. The drums are made of soft or hard metal.
Also, what is the function of the bands in an automatic transmission?
Bands are friction material-lined flexible metal rings that surround and are used to stop rotating clutch drums. One end of the band is attached to the transmission case, while the other is engaged by a hydraulic piston in a servo. The servo contains a spring to disengage the band when hydraulic pressure is removed.
Keeping this in view, what does a servo do in a automatic transmission?
It tightens to engage the gears, and loosens to release them. This type of transmission also uses a servo piston to activate and deactivate the bands. The transmission is connected to the wheels via an output shaft, which meshes to the axles in a variety of ways, depending on your car's design.
An automatic transmission usually has more than one planetary gear set. They work together to create multiple gear ratios. Because the gears are in constant mesh in a planetary gear system, gear changes are made without engaging or disengaging gears, like you do on a manual transmission.