Power transmission by manpower
The utility model relates to a kind of actuating unit, refers to a kind of transmission device with chain or belt transmission power that is specially adapted to human powered vehicle and manual machine especially.
At present, the transmission device of general human powered vehicle is by drive sprocket axle, driving wheel, follower shaft, the follower of band ratchet, the chain or the belt of transmission power are formed, and when the user did work clockwise, driving wheel was by chain or belt, driving follower and follower shaft clockwise rotates, and when the user counterclockwise did work, driving wheel rotated counterclockwise, and had only follower to rotate counterclockwise thereupon, and owing to the subsidiary ratchet of follower is had an effect, follower shaft can not rotate counterclockwise, and is unpowered output state, and this just requires the user to keep same direction constantly to do work always, just can make follower shaft by same direction outputting power, therefore, for the muscle group that reaches this acting purpose will move repeatedly, fatigue will soon appear.
Goal of the invention of the present utility model provides a kind of driving wheel clockwise or rotate counterclockwise all transmission devices of exportable power.
The technological scheme that realizes goal of the invention of the present utility model is: comprise drive sprocket axle 1, driving wheel 2, follower shaft 3, first follower 4 of band ratchet, annular power belt 8, crucial part is: second follower 5 of establishing a band ratchet on follower shaft 3 in addition, the ratchet direction unanimity of two followers, at other commutation wheel shaft 7 and the reverse wheel 6 that is provided with a usefulness bracket supports of follower, annular power belt 8 is linked in sequence and is loaded on driving wheel 2 on the drive sprocket axle 1, is loaded on follower 5, is loaded on reverse wheel 6, be loaded on first follower 4 then, get back to driving wheel 2 at last.
By above-mentioned the utility model, two upper ends that are contained in the follower on the same follower shaft are connected respectively to the top and bottom of driving wheel, no matter so driving wheel clockwise or rotate counterclockwise, always there is a follower clockwise rotating, another follower rotates counterclockwise.Because of the effect of ratchet is arranged, the follower that rotates counterclockwise is in the slip idling conditions, so actual what have an effect is that a follower that moves in the direction of the clock passes to follower shaft in the direction of the clock to power, reach the purpose that eternal maintenance follower shaft does work in the direction of the clock, this particularly is suitable for the pedicab of child's bicycle or old man's use, increase recreationally, also be difficult for to produce muscular fatigue.
Fig. 1 is a structural representation of the present utility model.
When Fig. 2 is the acting of the utility model driving wheel clockwise direction, the schematic representation of power output.
Fig. 3 is the utility model driving wheel when counterclockwise doing work, the schematic representation of power output.
Above-mentioned annular power belt 8 is ring chain or endless-belt.
The follower of two above-mentioned band ratchets is contained in an end of same follower shaft 3, and it is spaced apart and does not hinder the minimum range of independent rotation respectively mutually.