| 摘要 |
<p>Speed gearboxes use a synchronising gear and a clutch. As a consequence, manual shifting involves a double operation while automated operation requires sophisticated electronic systems. The invention in question eliminates the synchronising gears and the clutch for changing the speeds, and therefore notably simplifies both manual use of the gearbox and its automation. Male D... and female E... elements are connected to the gears which are free to rotate around a shaft, and to the shaft itself with grooving and, when engaged, connect a gear to the shaft. The female elements, if arranged with a certain orientation E..d with respect to the shaft, present a helical surface suitable for repelling the male elements D..d provided with a greater angular speed, V2>V3; the same female elements, if arranged with the opposite orientation, E..s, rotated 180 degree, that is, around an axis perpendicular to the shaft, repel the male elements D..s provided with a lower speed, V2<V1. To change gear, the element connected to the shaft is disengaged from the element connected to a gear and shifted towards that element (2 for every intermediate gear) connected to the gear of the desired speed, capable of repelling it. When decelerating or accelerating, the difference between the two speeds decreases until its sign changes: that is, the male slows its stroke on the helical surface which repels it until it stops for a moment on the same and then begins to travel along it in the opposite direction and is immediately blocked and compelled to insert itself into the space which the female elements present between the beginning and end of the helical surface. A mechanism P/M..., better illustrated below, co- ordinates and groups the various movements in such a way as to be able to change any speed with a single unidirectional movement. <IMAGE></p> |
