CVT Transmissions or continously-variable transmission or transaxle, have endless gear ratios. The engine runs at a constant speed without having to change gears. The goal is to maximize engine efficiency. A CVT transmission has a longer maintenance interval. The early versions of CVT transmissions had higher failure rates compared to the automatic transmission.
- This type of transmission makes use of a steel belt running in a pair of variable-width pulleys to provide varying gear ratios. The pulley ratios change the vehicle speed and the load on the engine. This will allow the engine to run at a more constant speed and close to its maximum operating efficiency. A hydraulic control system varies the pulley ratio.
- To get the forward motion, the forward clutch locks the sun gear and the planer carrier together. For the reverse motion,, the reverse clutch locks the ring gear to the case. This causes the planet pinions to turn the sun gear and output shaft backward. The gear ration spread is about the same as provided by a five or six-speed manual transmission or transaxle.