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US 9,970,520 B2Granted
Continuous variable transmission with uniform input-to-output ratio that is non-dependent on friction
OwnerRaja Ramanujam Rajendran, Prashanth Ram Rajendraninventors
Life of this patent
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Abstract
A continuously variable transmission (CVT) that does not depend on friction to transmit power. A constant and uniform output angular velocity can be achieved when the input angular velocity is constant and uniform by modifying the rate of change of angular displacement of the input disk using a set of non-circular gears. Co-axial input and output can also be achieved.
Claims14
A continuously variable transmission, comprising:
- at least one module, comprising:
- (a) an input disk having a radial slot with a length extending in a substantially radial direction, disposed between
- (b) a ratio cam disk comprising a non-radial slot extending at least partially in a non-radial direction and
- (c) a rack assembly comprising one or more racks having longitudinal axes that are normal to a longitudinal axis of a first slot, the first slot receiving
- (d) a crank pin, wherein the crank pin is disposed in the radial slot of the input disk, in the non-radial slot of the ratio cam disk, and in the first slot of the rack assembly, and extends parallel to a longitudinal axis of the input disk;
- (e) one or more pinions mounted on one or more pinion shafts and coupled with the corresponding one or more racks;
- and
- (f) at least one driven non-circular gear that has a functional and a non-functional region being operably connected to the input disk;
- wherein the at least one module is arranged such that at least one driving non-circular gear, provided on a drive shaft, rotates about a longitudinal axis with a uniform angular velocity and meshes with and drives the at least one driven non-circular gear causing a non-uniform angular velocity of the input disk about its longitudinal axis, wherein the crank pin reciprocates the rack assembly with the rack assembly being only allowed to move along the longitudinal axes of the one or more racks, and the reciprocation of the rack assembly rotates the one or more pinions, and the rotation of the one or more pinions periodically alternates directions and is converted to unidirectional rotation of an output gear or sprocket, wherein the output gear or sprocket is rotated by the one or more pinion shafts and at least one of a one-way bearing, a ratchet mechanism, or a computer controlled clutch, which engages the output gear or sprocket to the pinion when the pinion rotates in a specific direction.
6 more elements
Dependencies are inferred from the claim text.