Перевести в переводчиках не правильно переводит
when a bicyclist wants to race on a level track, he gears up his drive wheel
with a larger sprocket, so that one revolution of the crank takes him further. yet
if he takes his wheel, with this large sprocket on the pedal shaft, out on the road
where there are hills, he must get off and walk, or exert an extra lot of power.
the same principle applies to the automobile. for this reason the
automobile is provided with four or five changes of gears. these gears are
contained in a gearbox usually placed at the back of the clutch.
the principle, upon which all change-speed gears work, is the fact that
when two gear-wheels or spur-gears are meshed together, the larger wheel
turns more slowly than the smaller.
in the gear-box there are two shafts — the upper one coming from the
engine through the clutch, and the lower one continuing to the back axle.
each shaft is fitted with four or five gear wheels of different size.
those on the upper shaft are fixed to the shaft itself, but those on the lower
shaft are able to slide on a keyway, to right and left along the shaft. the lower
shaft is square so the sleeve of the gear wheels can slide backward and
forward, but they cannot revolve independently of the lower shaft.
in order to vary the speed of the car, it is only necessary to slide the gear
wheels along the lower shaft until the correct two gears come into mesh to
form the gearing required.

saidislom01    3   25.10.2019 15:43    4