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3.
powm
TRANSMISSION
Power transmission is defined
such mechanism
as
rotation
of
crankshaft.
is
transmitted
to rear wheel.
The
first step
of
transmission
from
crankshaft to
clutch is done by
chain.
This
clutch is
wet
multiple plate type, so there
is no
heat generated by
friction and
also
no noice
perfectly.
As
this
transmission
is
such type
of
advance 4-step and constant meshing,
there
is no
gear
sound while in gear changing,
and
consequently
made it possibl
e
to wid en rear
wheel
driving
power of powerful
engine.
Further power is transmitted to the
rear wheel
sprocket
by
chain
drive
from the
mission,
and through
rear
wheel dumper
of
rubber
made to the
rear
wheel
sprocke
t
and
the
rear wheel torque is transmitted
betwee
n
the final driven flange.
So that torque is transmitted very sm
oothly
without chain knock getting smooth
running.
Especially
as
clutch
is located
on
th
e
mission shaft. made
it
possible
to
minimize
de-
deflection of
crankshaft and also to
stabilize clutch
function reducin
g
clutch
inertia.
A. Clutch and primary
chain
Clutch
f
I
I
Function and
kinds
Function of
clut ch
is to cut
Or engage power
transmission
in
ca
Se
of
changing
gear
or starting
locating
between
th
e engine
and
the
transmission
mechanism.
Th erefore
fineness of cutting and
smoothness of
engaging and
disengaging
are
im-
portant feature.
Th
ere
are several kinds
of
clutch
system
as cone clutch,
centrifugal
clutch,
multi-
plate clutch
and
single clutch, ond w
e
call wet
type
when merged in
oil
and
dry
system
when oil is not used
inside.
f21 Construction
and functi
on
For
Honda 250
,
300 we
adopted type
of
wet multiplate clutch.
As shown in
Fi
g
.
3-1
IDisassembled
fIgurel
and
Fig.
3-2
leross sectional
fIgurel
,
there
is
clutch
outer
compl
ete
when crank case
cover
is
taken
out.
In
the
clutch
outer
complete, clutch spring 1101
in set by
4
of
6
X
24 hexal bolts
pressing
clutch
pressure
plate
191
and
sandwitching
clutch
friction disk 16.).
by
clutch
plate
171.
Inside of the clutch plate
teeth
are
cut
which
mesh with
that
of
outer part
of
clutch
center
181, and the clutch
center
is connected with the transmission mainshaft
by
spline
a
nd
rotates
with
1
81
171
and
191 as a whole with
th
e
transmission
mainshaft.
100
ill
L-cronk
case
cover
®
Clutch
pressure plate
@
6X
19
washer
®
L-crank ca se cover
packing
®
Clutch
spring
@
14257
oi
l seal
®
Oi
l
filter cover
@
Clutch
lifter
joint
piece
@
6X24 Hex
bolt
0
57X3
O-ring
@
Oi
t
guide metal
pin
®
6X74
head
®
cross
screw
Ctutch
outer compo
@
Oil
guide
meta
l
@
6X
I
O
/I
®
Clutch
fr
ic
tion disk
®
/I
Oil guide metal spring
@
6
X
45
G:l
Clutch
plate
@J
25'%1
cir
clip
@
6X35
/I
®
Ctutch
center
@
l
· leg
sealed under bolt
@
6XI6
/I
Fig.
3-
1.
Disasse~bled
picture
of
clutch
On the
other
hand
,
wi th
th
e groove
cut
a
long
the
outer perimeter of clutch outer,
the
clutch
friction disc is connected
through
fl
ange
mating with said groove,
and
the
tra
nsmission main shaft can rotate freely.
Therefore in case
of
disengaging
clutch, 191 161 171 161 171
161 171
161 171
181 and
151
are
pressed by clutch
springs,
ro
tatin
g
power
of
crank is transmitted
to
th
e
mission
as a
whole by friction.
10
1
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