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CONTINUOUSLY VARIABLE RATIO GEAR SET

IP.com Disclosure Number: IPCOM000241976D
Publication Date: 2015-Jun-11
Document File: 3 page(s) / 338K

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The IP.com Prior Art Database

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CONTINUOUSLY VARIABLE RATIO GEAR SET

     Ratio adjustments for speed and torque of a rotating mechanical force are traditionally done by using multiple gear sizes or multiple pulley sizes. Continuously variable transmissions use pulleys and belts where the pulleys open, and close, causing a belt to transfer a rotating force at varying diameters. They all require using a change in diameters that a rotating force will transfer through, in order to change ratio. Causing a device to change to varying diameters can require complex mechanisms, and use a large amount of energy.

     We have developed a method that changes the ratio of a rotating mechanical force, from its input to output shaft, without varying or shifting to different diameter gears or pulleys along the path of ratio adjustment. This is done by using a set of planetary gears that independently rotate around a sun gear. The planetary gears are attached to the sun gear axis by way of connecting arms that spin freely around the sun gear's shaft. The planetary gear's connecting arms are connected to a wheel using pins that can travel along a slot in the connecting arms that allow the wheel's shaft axis to be moved with respect to the sun gear's shaft. Moving the wheel's axis causes the planetary gears to rotate around the sun gear at different speeds with respect to each other. Normally the planetary gears would spin freely around the sun gear. These planetary gears ride on one way clutch bearings that allow rotation in only one direction. The combination of these events cause a ratio change between the input and output shaft, that is dependent on the amount offset from input to output axis, when rotating in the direction that restricts rotation of the planetary gears. A second design has the planetary gears revolve within a sun gear. In other words, the sun gear has internal teeth, and forms a ring around the planetary gears. Other than this change, the mechanism of ratio change operates in the same way.

     Furthermore, the change of the output wheel's shaft axis position is be controlled by a mechanism that changes the output wheel's shaft position while maintaining the mechanism's shaft in a fixed position. Two methods are proposed as examples of how this is accomplished. One method uses an arm with a fixed shaft axis, connected to the output wheel's shaft at the other end. When the arm is moved, the output wheel's shaft position is changed on an arc. The output wheel's shaft is extended and has a gear installed on the extended portion. This engages a gear with internal teeth that is designed with an inner diameter that follows the arc of its mating gear. This gear with internal teeth maintains its axis position, and is used as the output.

     In the second method, the output wheel's shaft is again, extended, and has a gear installed. This gear's position is controlled by three or more gears that engage its outer diameter. These three or more gears have at least one gear that's a differ...