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4. Engine Torque Transmission - Diagram (Fig. 4) (C) so that they run at the same speed. The run-
and Description ning of the layshaft gears (4) and (5) at different
speeds is enabled by the freewheel (D). The gear
Gearbox change is effected by the automatic centrifugal
The diagram of the two-speed automatic trans- clutch (C) provided with two shoes of the leading
mission is shown in Fig. 4. type. The operation of this clutch is controlled by
force closing between the parts (2'), (6) and (7)
The torque is transmitted from the crankshaft
(1) to the gears (2—2') over the starting clutch
(B) by an indented belt. From the output shaft (7), the torque is trans-
mitted to the rear wheel by means of secondary
1st-speed gearing: transmission.
It is formed by two pairs of involute spur gears
(3, 4, 5 and 6) meshing with the freewheel (D) The force-closed clutch engages the respective
between the gears (4) an(5) on the layshaft. From gear depending on the road speed, the drive taken
the gear (6), the torque is transmitted over a force off the automatic transmission, the acceleration
closed mechanism to the output shaft (7) and and deceleration, and the rolling resistance of
the rear wheel by means of the secondary trans- the vehicle in terrain
mission chain.
2nd-speed gearing: The output shaft (7) with the gear-change me-
chanism runs in two ball bearings. The layshaft
Parts (3), (6), and (7) are coupled with the clutch is supported by two bronze bushes.
ZVL model 210 Workshop Manual Page 8
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