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Design solutions and active safety increasing for "VZN" shock absorbers

Niculescu A. I.

Journal of KONES

2007

Vol. 14, No. 4

295-306

The paper presents the principle, some design solutions and last theoretical and by simulation results, for the suspension realized with the self-adjustable shock absorber, called shortly VZN, relative to the standard one. The self-adjustable shock absorber VZN, an intelligent shock absorber, realized without electronics or mechanisms, grant with European Patent EP1190184B and Romanian Patent 118546, is much better than standard ones because confers possibilities of stepwise adjustment of damping force as function as the instantaneous piston position. That means lower damping coefficients at the stroke beginning, for easier medium position arriving for a well adherence, damping coefficients for well correspondence between comfort and adherence, in the medium area, high damping coefficients both adjacent parts at the medium area for better adherence and well axle movement brake, and very high damping coefficients at the ends, for better body and axles protection. This concept is realized with planar or circular valves, a new patent request presenting specific solution. The cheaper and compact solution uses metering holes like damping valves, some of these being presented in the paper. The theory shows its great damping coefficient evolution with the stroke, give progressive anti-gyration effect and regressive redressing gyration effect along vehicle body transversal and longitudinal axes, increasing pitch and roll stability. Simulation tests denote high performances for VZN shock absorbers, relative to standard one, its great adaptation capacity relative to load, road condition, and efficiency, better body stability-skyhook behaviour, better protection at the stroke ends, lower RMS body acceleration, improving pitch and roll stability at and so active safety increasing. So the automotive self-adjustable shock absorber VZN, confers high performances, nearly semi-active suspensions at low costs, nearly standard shock absorbers being an important option for the future.