In a conventional automated transmission, the gears are basically gears -- interlocking, toothed wheels that enable transmit and modify rotary motion and torque. A combination of planetary gears results in all of different gear ratios that the transmission can create, usually four forward gears and 1 reverse gear. A CVT, https://dallasdqttq.ambien-blog.com/40628932/gearbox-cvt-an-overview