MOTO GUZZI V1000 G5 Workshop Manual page 133

position just enough to allow such free run, thus
assuring separation of the contact bridge. This is
necessary when the pinion does not come out of the
crown gear. (In previous models the engaging lever
was rigid ly connected with the relay armature with a
spring for opening in the engaging device).
The armature shaft, at the pinion side, has a helical
groove (fig.
188/ 3-188 /4-188 /
5) in which is housed
an entraining ring which is mated to the pinion by
a roller type free wheel. The helical direction is such
that the pinion is kept still and engages the crown
wheel when the armature is rotating. The entraining
ring fits two sliding guiding discs into which enter
the forked lever ends.
In between the guiding disc and Ihe entraining ring
there is the so called return spring so that the en-
gaging lever is always moving till
it
bottoms up and
the current can also come through (this occurs when
the bridge and conlact close) , if one of the pinion
teeth is pressing against one of the crown wheel
teeth.
Thus, the engaging lever pushes the entrainer and
pinion forward. In addition, due to the screwing in
effect in the helical groove, the pinion in pushed
right in fully.
Only when the pinion is fully engaged , the helical
groove allows a couple to be Iransmitted to the en-
gine to be started .
The free wheel coupling provides forced intercon-
nection between the motor armature and the engine
flywheel after the engagement has occured and dis-
connects as soon as the engine revs. get higher
than the starter motor speed.
Engagement
The pinion-wheel coupling process occurs in two
stages : translation and screwing in. This is why this
Iype of starting device is called .. translation and
screwing in starter motor ... However, the engage-
ment of the starter motor really occurs in a Single
stage. Initially, after pressing the start button, the
engaging lever moves towards a spring but does not
fully activate the excitation windings and the arma-
ture. In this stage the motor does not yet revolve.
Through the pinion side guiding ring and the enga-
ging spring, Ire enlrainer-pinion assembly is pushed
against the crown wheel and in so doing these parts
start rotating due to the helical effect.
In this way. if the pinion meets a space between 2
of the crown wheel teeth (lig. 188/ 6), it immediately
engages as deep as allowed by the engaging lever
pressure or in other words until the bridge starts
pushing on the relay contacts. Accordingly, the pi-
nion has done its translation run.
If in its initial movement the pinion strikes against
a tooth (fig. 188/ 7) , then the engaging lever, through
the guide ring on the pinion side, compresses the
spring to such an extent as to close the contact
on the bridge and the motor starts rotating. The pi-
nion slides on the tooth head and under pressure of
the preloaded helical spring and mainly because of
, -.- - - -
,
Series w inding
L--+--
L----··~H ~J
'---_ _ _ _ _ __ __ _ _ _ _ _ ---1188/ 2
Engaging
leller
Seal winding
, I
Schematic view 01 the translation type starter motor
with pinion screw down.
' -_ _ _ _ _ _ _ __ _ __ _ _ _ "88/3
I
E"9'9'09 leller
Roller
free whee l
D1sconne~ted pinion
co ntac t
131