Spring devices – Vehicle – Comprising compressible fluid
Patent
1992-01-30
1994-11-15
Oberleitner, Robert J.
Spring devices
Vehicle
Comprising compressible fluid
267 34, 267113, 280710, B60G 1510
Patent
active
053640810
ABSTRACT:
A moved mass of hydraulic medium is used as a compensating mass at critical frequencies of the suspension system to achieve a frequency-selective dynamic damping, and a suitable hydraulic transmission ratio can ensure that a relatively small quantity of hydraulic medium is moved at high speed in order to achieve a good compensating effect, despite the low mass of moved hydraulic medium. A displacement unit can be connected to the sprung mass via an elastic bearing part and to the associated spring accumulator via a hydraulic line. The spring constant of the bearing part, the mass of that part of the displacement unit or of the spring unit mounted on the bearing part, the cross-section of the hydraulic line and its length, the effective cross-section of the displacement unit and the density of the hydraulic medium are so sized that the resonant frequency of the spring unit is near a critical frequency of the suspension system, for example near the frequency of the axle resonance of a vehicle. Alternatively, the displacement unit can be connected to a first spring accumulator which is connected to a second spring accumulator via a hydraulic channel. The length and cross-section of the channel are so coordinated with the density of the hydraulic medium and with the characteristics of the spring accumulators that the natural frequency of vibrations of the fluid mass in the channel coincides at least approximately with one of the critical frequencies of the suspension system.
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Mercedes-Benz AG
Oberleitner Robert J.
Schwartz Chris
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