Spring devices – Resilient shock or vibration absorber – Including energy absorbing means or feature
Patent
1992-10-16
1993-06-15
Halvosa, George E. A.
Spring devices
Resilient shock or vibration absorber
Including energy absorbing means or feature
188282, 188298, 188312, 188317, 18832215, 267219, 267220, 416106, 416134A, 416140, 416500, F16F 920, F16F 934
Patent
active
052194302
ABSTRACT:
The hydraulic damper according to the invention has at least one restricted communication passage (47) between its two working chambers (8, 9) whose cross section is controlled by a viscous restriction valve (51) positioned via a control pressure of a fluid of a control damper with at least one secondary chamber (41, 42) delimited in a secondary cylinder (39) by a control piston (40), which cylinder and control piston are integrally attached, one to the main body (1), the other to the damping piston (4) of the damper, such that the damping law of the control fluid positioning said valve (51) is linked to the relative displacements of the main body (1) and damping piston (4).
Application to the equipping of elastic-return struts with integral damping, in particular for helicopter rotors and blades. FIG. 2.
REFERENCES:
patent: 2802664 (1957-08-01), Jackson
patent: 2886142 (1959-05-01), Orshansky, Jr.
patent: 3638885 (1972-02-01), Reed
patent: 4898264 (1990-02-01), Miller
Aerospatiale - Societe Nationale Industrielle
Halvosa George E. A.
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