Patent ID: 7204771

Claim:
A bidirectional continuous power transmission system, comprising: a primary wheel, consisting of a primary fixed half-wheel and a primary movable half-wheel, mounted on a primary axle about a primary axis connected with a power source, and rotating either in a positive direction or in a reverse direction; a secondary wheel, consisting of a secondary fixed half-wheel and a secondary movable half-wheel, and mounted on a secondary fixed axle about a second axis; a transmission belt, running over said primary wheel and said secondary wheel, so that said primary wheel, running at a primary speed, drives said secondary wheel to run at a secondary speed; and a torque cam assembly, mounted on said secondary wheel and further comprising a projecting bolt, having an inner end that is attached to said secondary fixed half-wheel, and an outer end, and a guiding opening at said secondary movable half-wheel, passed through by said outer end of said projecting bolt, and having a rear wall and a front wall each having different curvatures that operate to effect different speed ratios of transmission in positive and reverse directions; wherein, when said primary wheel rotates in said positive direction, said projecting bolt leans against said rear wall of said guiding opening, causing said secondary fixed axle to rotate in said positive direction, and, when said primary wheel rotates in said reverse direction, said projecting bolt leans against said front wall of said guiding opening, causing said secondary axis to rotate in said reverse direction, so that bidirectional continuous power transmission is achieved.