During gear shifting, release bearing push diaphragm spring finger due to release fork movement.That is , release bearing push diaphragm spring finger as moving toward esgine side,pressure plate is mowed engine opposite by the reason of a lever principie.As a result clutch is disengaged and power is cut off.

Except during gear shifting,power is transmission due to contact of pressure plate and clutch disk.

Clutch release bearing always rotates same RPM as crank shaft and during gear shifting,axial load is applied to release bearing