Abstract: A variable speed transmission device of the type in which a first rotatable element is in rolling friction engagement with a second nutatable element having an axis movable in a biconical path about the axis of the first elements. The first element supports a pair of axially movable cone-like members fixed for rotation with the first element and each having exterior surfaces of revolution defined by a curved generatrix to be convex in axial section and converging away from the point of first and second element axes intersection. The rolling friction surfaces of the second element are defined by an interior cyclindrical surfaces and means are provided for adjusting the angle of the second element axis with respect to the first to vary the radii at the point of frictional contact on the cone-like members.

Abstract: A variable speed transmission device of the type in which a first rotatable element is in rolling friction engagement with a second nutatable element having an axis movable in a biconical path about the axis of the first elements. The first element supports a pair of axially movable cone-like members fixed for rotation with the first element and each having exterior surfaces of revolution defined by a curved generatrix to be convex in axial section and converging away from the point of first and second element axes intersection. The rolling friction surfaces of the second element are defined by an interior cylindrical surfaces and means are provided for adjusting the angle of the second element axis with respect to the first to vary the radii at the point of frictional contact on the cone-like members.

Abstract: A variable speed transmission device including a torque variator of the type in which a first rotatable element is in rolling friction engagement with a second nutatable element having an axis movable in a biconical path about the axis of the first element. The first element supports a pair of axially movable cone-like members fixed for rotation with the first element and each having exterior surfaces of revolution defined by a curved generatrix to be convex in axial section and converging away from a point of first and second element axes intersection. The rolling friction surfaces of the second element are defined by interior cylindrical surfaces on a tube-like member and means are provided for adjusting the angle of the second element axis with respect to the first to vary the radii at the point of frictional contact on the cone-like members.