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Hydropneumatic Chassis Suspension for Damping Proportional to Loading
Technical Paper
785088
Sector:
Language:
German
Abstract
Composite shock absorbers consisting of hydraulic dampers and
coiled springs or air springs form compact damping units. However,
the telescoping, hydraulic dampers react independently of loading.
Consequently, if shock absorption is designed for full-load
operation, the vehicle is over-damped at partial loads. The paper
presents a new shock absorber design to overcome this problem: a
unidirectional, hydraulic shock absorber is centrally installed in
and attached parallel to conventional air spring bellows. An
auxiliary membrane is mounted between the air spring fitting and
the hydraulic cylinder; air spring pressure acting upon it assures
that damping force does not exceed the vehicle loading. The
operation of this hybrid shock absorber is explained in detail.
An experimental model of this proposed design was produced and
tested. Results for various operating conditions and frequency
ranges are compared to test results of conventional shock
absorbers. As hoped, the hybrid design provided relatively flat
damping characteristics throughout the loading range whereas the
conventional design characteristics proved strongly
load-dependent.
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