| 摘要 |
A reversible variable speed drive mechanism is disclosed formed of an engine crankshaft and a balancing shaft parallel to the crankshaft. A second pulley is non-rotatably secured to a first end of the balancing shaft. The second pulley is coupled to a first pulley at a first end of the crank shaft by a belt. The second pulley has a belt supporting circumference which is adjustable such that the speed of the balancing shaft is adjustable by altering the circumference around which the belt travels. A planetary gear assembly is coupled to a second end of the crankshaft. The balancing shaft sprocket is coupled by a chain to a sprocket on the planetary yoke such that the rotation of the planetary yoke is coupled to the rotation of the balancing shaft. By altering the rotational speed of planetary yoke relative to an input gear, the output gear can be made to rotate in a first direction, in a second direction or assume a neutral stationary position. A locking sprocket is rotatably mounted on the balancing shaft. The locking sprocket is coupled by a chain to a sprocket on the input gear such that the locking sprocket rotates in response to rotation of the input gear. By locking the locking sprocket to the balancing shaft when the output gear is in a neutral position, the speed of the planetary yoke relative to the input gear is maintained. |
