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92
Fig. 4. 67
Removing the rear cushion assembly
©
10mm cap nut
®
6mm bolt
4.
FR AME
A Do Carbon type rear damper is employed on
the 450 which is of a single cylinder double acting
type in contrast to the double cylinder single acting
type commonly used.
Nitrogen gas and oil are sealed within the cyl-
inder under pressure to
constantly
maintain an
internal pressure.
During extension and compression of the cushion,
the oil flows
through a small passage
in the
piston in either direction
to operate
the valve
which controls the dampening for both the compres-
sion and extension.
{Fig. 4. 65)
Dampening force :
Extension
70 kg/0.5 m/sec
( J
54 lbs/20 in/sec)
Compression
J
6 kg/0. 5 m/ sec
(35 lbs/20 in/sec)
Feature and Performance
a.
Simple type of a construction
Due to the lack of outside tubular shell, the
heat radiation
is good and. the oil changes
are small.
Therefore, the performance does
not
degrade.
The number of parts hove been reduced,
simplifying the costruction ; minimizing valve
noise and increasing its service life.
The dampening force is dependent upon the
piston speed ; performance being especially
good at low speed.
Further, vibration stabi-
lizes very quickly
.
b.
Internal pressure constantly maintained
Air and oil mixture !erasion) will not occur ;
function will not deteriorate even when operat-
ed for extended period over adverse rood
condition.
Since the oil seal is constantly under pres-
sure, there is no problem with
leak ; service
life is greatly extended.
The differerence in pressure between the
front and rear of the valve is small ; since
foam does not form, noise is minimized ; de-
terioraton of the dampening force is prevented.
NOTE:
Do not disassemble the damper.
The use of pressurized nitrogen gas elimi-
nates any
havard.
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