Honda CB450 1968 Service Manual page 199

188 7. SUPPLEMENT OF CB/ CL 450 Kl-K7
Double tube, double acting type rear shock
absorber
The rear shock absorber assemblies feature the
telescopic type oil dampers with bottom valve to
give an optimum damping performance under all
bumping and rebounding conditions. The damping
performance on the extension side is well matched
with that on the compression side, pro viding maxi-
mum damping.
Stroke of rear shock absorber: 77.3 mm (3.04 in.)
Piston valve
valve
Fig. 7. 114
CD
Rear shock absorber spring
®
Damper rod
@
Damper piston
©
Damper cyl inder
---------------------,
Extens ion
1
(Piston valve side)
(Bottom valve side)
- Oil flow on compression
- --- Oil flow on extension
Fig. 7. 115
®
@
®
CD
Orifice
(I)
©
Piston
®
Chamber "c··
®
Valve "A"
®
Chamber "a"
@
Bottom valve
@
Valve "B"
@
Chamber "b"
®
Orifice !I ll
Operation
Each oil damper is equipped with the piston
valves A and B and bottom valve. On the ex-
tension side, the damping action is provided by
means of the piston valves . While, on the com-
pression side, the damping action is provided by
means of the bottom valve .
On extension side :
The oil in the chamber [a] flows into the chamber
[b] through the orifice ( I l in the valve A (sheet
metal). By the resisting force of this oil, the damp-
ing action is provided. The valve A is overlapped
with the valve B lleaf springl which covers the half
of the orifice. The damping action is regulated
by the deflection of the valve B. Under such a
condition , the bottom valve is opened and the oil
in the chamber [c] flows into the chamber [b]
smoothly to prevent air bubbles from being produced.
On compression side :
The oil in the chamber [b] flows by amount of
oil equivalent to the volume of damper rod into
the chamber [c] through the orific e in the bottom
valve. By the resisting force of this oil, the damp-
ing action is provided . At this tirre the piston
valves are opened and the oil flows from the
chamber [b] into the charrber [a] smoothly .