Sachs SA 340 - Page 25

ENGINE WITH BOSCH SOLENOID-CONTROLLED
STARTER
(Type DD)
Fig. 35
To remove starter, unscrew 2 nuts
(1) M 8 with spring washers.
Fi g. 35
The pinion of the solenoid - control led starter (Fig. 35) slides on a coarse thread on the
armature shaft and is first pressed up against the gear rim by mea ns of a shi ft lever
unt il it engages with it . The lever is electro-magne ticall y operated . Sh or tly after en-
gagement of the pinion, the swit ch mounted on th e starter automatically closes - on
mecha nically operat ed sta rter s by means of the engaging lev er - the armature revol-
ves and the pinion screws it self further for wa rd on the coa rse thread un til it is ful ly
e
ngag ed. Even if tooth on tooth e ngag eme nt occurs, the switch w ill close, as the
spring is spring-connected to the guide ring and th e l ever is ther efore not hindered in
its
movem e nt; w hen starting , the armature turns th e pinion until it can engage. As
soon as the pinion runs up aga · in st i ts coun te rpart, fi rm contact is established between
it and the ar mature, and the engine is being start ed.
If , after star ti ng , the eng ine begin s to ove rtak e the star te r, the pin ion is uncoupled
from the armature s haft by an ov err unning ro ll er clutch, but remains en gaged w ith th e
gear ri m until the enga · ging l ever is r et urned to its ini ti al position by a re turn spring.
To e nable the starter to come to rest as soon as possib le after bei ng sw itched off, and
to enable a new sta· rt to be made shortly after wa rds, an armature brake is installed on
th e commutato r bearing of the starter .
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