Variomatic
![Belt and pulleys of a Van Doorne transmission](/Images/godic/202502/19/Pivgetriebe5155.png")
![Variomatic transmission and rear axle. The larger green drums on the left contain the vacuum mechanism that controls the variable pulleys. The rear wheels are driven by separate belts, eliminating the need for a transaxle.](/Images/godic/202502/19/DAF_Hinterachsantrieb5155.jpg")
Variomatic is the continuously variable transmission (CVT) of the Dutch car manufacturer DAF, originally developed by Hub van Doorne: It is a stepless, fully automatic transmission consisting of a "V" shaped drive belt and two pulleys, each of two cones, whose effective diameter can be changed so that the "V" belt runs nearer the spindle or nearer the rim, depending on the separation of the cones. These are synchronized so that the belt always remains at the same optimal tension.