Clutch
The construction of the clutch is shown in pict. 4
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Schematic the clutch is shown in pict. 5.
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Pict. 5
Operation:
Spring 1 is filled with steel balls, the spring ends are
screwd together.
The diameter of the spring is less than the diameter of
the clutch hub on which the spring is fitted, so that
mounting causes a certain prestress in the spring.
When the crankshaft is revolving, all the shaded parts
and the clutch spring revolve since all those parts are
attached to the crankshaft.
At about 2500
rpm.
the centrifugal force on the balls in
the spring has become sufficient to exceed the
pre-stress
force in the spring, resulting in an outward mouvement
of the balls.
As the spring will now move along the sloping side of the
clutch hub 2, it will at the same time be forced to move
to the left side, pressing together pressure plate 3, clutch
plate 4 and endplate 5.
In this way the clutch plate (with cams) will cause the
clutch housing 6 to rotate.
When starting the engine the proces is reversed. Now
the starter leaf spring 7 presses all plates together.
The distance between the starter leaf spring and the
thrust piece (x in pict. 5) has to be .5 - 1 mm
<.020"-.039").
This distance can be adjusted by bending the leafspring
fitted on the housing, in case the distance is to small.
If the distance is to large the starter leaf spring has to be
removed from the engine. After putting it in a vice it can
be bended into correct position and refitted again.
Always grease the thrust piece!
A needle bearing, supplied with an oilseal at the crank-
case side is fitted in the clutch housing.
A seperate seal is fitted in the opposite side of the bore.
This is a feltring at first assembly.
Storing may cause the feltring to become dry. Therefore
it is much better to fit an oil seal instead of a feltring, in
case of repair.
If a new needle bearing has to be fitted it should be done
in such a way that the measure ij in pict. 5 is 25.5 -
26.5 mm (1.0039"
-1.0079").
4
Only press on the marked side of the cage, other-
wise the needle bearing will be damaged irreparable.
The clutch housing of the 20
mph.
and 25-30
mph.
engines are different broadwise, because the
V-belt
and
the primary reduction are different for the 20 mph. and
25-30 mph. engine.
10.76
6
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