"Hydrostatic" CVTs

Principle: Hydrostatic CVTs convert rotational motion into fluid flow (hydrostatic pump), and then back to rotational motion (hydrostatic motor).

In some cases the fluid flow is continuously varied by variable displacement pump. There are other cases where the variable displacement unit is the hydrostatic motor, or both.

The most common types of hydrostatic units:

Bent Axis Pump (variable angle)	Radial Piston Pump (variable axis offset)	Vane Pump (variable axis offset)
The hydrostatic pumps and motors efficiency is usualy around 60%..80% but recent units have better efficiency.