When rebounding
As the piston rod rises, oil flows as shown in the
figure on the left and the damping force is determined
by the flow resistance of the piston valve.
MEDIUM (medium damping force)
When bounding
Compared to SOFT damping force, the orifice
diameter is smaller, piston rod flow resistance
increases and the damping force is the force
combined with the flow resistance on the base valve
side.
When rebounding
The orifice diameter is smaller just as when bounding
and a higher damping force than at SOFT is obtained.
HARD (high damping force)
When bounding
Since the orifice is closed, oil in the lower part of the
piston pushes wide the valve in the upper part of the
piston and flows out so flow resistance increases and
a higher damping force than at MEDIUM is obtained.
When rebounding
This is the same as when bounding. Since the orifice
is closed, damping force is at its maximum.
DRIVE-CONTROL COMPONENTS - Electronic Control Suspension (ECS) 3-15
Internal Operation of Shock Absorber
SOFT (low damping force)
When bounding
The damping force is determined mainly by the flow
resistance on the base valve side and a low damping
force is obtained by passing oil in the lower part of the
piston through the check valve built into the check nut
and the orifice (large dia.) with no resistance.
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