Bentley R Type - Dynamo

86
THn
'R'
TvpB
BBNTTBY.
Dynamo.
The
dynamo,
shown
in Fig.
41
,
is driven
by
the
same
belt
which
also drives
the
water
pump and
fan.
It
is
of the
shunt-wound
type,
the excitation
of the
field
being
automatically
regulated,
in
order
to
adjust
the
charge
rate to
suit the dynamo
speed,
the
state of
charge
of the
battery
and the
lighting
load.
There
are three
external
terminal
connections,
two
large and
one
small,
one
large
terminal being
the
"armature" connection,
the other
one being
eatthed
to the
chassis frame.
The
smaller
terminal
is the
"field"
connection.
The
armature
lead
from the large
terminal
is taken
to the
output
regulator
and
connected to
the terminal
marked
"D",
and
similarly
the
field
connection
is to the
terminal
marked
"F"
in
the
fuse box.
1.
Dynamo.
Fie.41.-THE
DYNAMO.
3.
Slotted
Link.
2. Cover-Brush
Gear,
4, 5, 6 and
7, Securing
Nuts.
Every
2o,ooo
miles,
as directed
on
page
33,
take
out
the securing
screws
and remove
the
cover. This will
expose
the
commutator
and
brushes,
which
should
be
inspected. Deposits
of
brush
dust,
moisture
and
oil
should
be
removed,
and
note taken
of any appreciable
wear
of the
brushes.
Cleanliness
of the
commutator and
freedom of the dynamo
brushes
in
their
holders
are
the most important
points
in
the
maintenance
of
the
dynamo.
Premature
failure or excessive
wear,
however,
indicates Some
definite
fault
in the
machine,
which
should
be
returned for
correction.
fn
normal
circumstances
the brushes
should
need replacing
only after
considerable
running;
in
the event,
however,
of
a new set
of
brushes
being
required,
it is
recommended
that
this
work should
be done by