| 摘要 |
<p>In the transmission unit providing for stepped change of ratio and generally continuous transmission of power first shaft 9, 19 is rotating together with coaxial set of gear-wheels 10, 20, permanently meshed with corresponding free gear-wheels 11, 21 coaxial with second shaft 8, 18, and selected free gear-wheel is actuated and/or deactuated by integrated clutch 14, 24 movable along the axis of second shaft 8, 18. Both shafts may serve for the input and the output of the gear-box: while the input is on first shaft 9, the output is on second shaft 8, or while the input is on second shaft 18, the output is on first shaft 19. The clutch 14, 24 may slide along the axis of the shaft internally or externally, i.e. inside or outside of free gear-wheels 11, 21. The clutch 14, 24 acts upon corresponding surface 12, 22, 13, 23 with a force perpendicular to the axis of the shaft 8, 18. The clutch 14, 24 actuates and/or deactuates selected free gear-wheel 11, 21 with corresponding surface 12, 22, 13, 23 by frictional or other engagement.
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