Resilient return strut of the elastic-hydraulic type with incorp

Details Resilient return strut of the elastic-hydraulic type with incorp Resilient return strut of the elastic-hydraulic type with incorp

1990-05-17

1991-04-02

Halvosa, George E. A.

Spring devices

Resilient shock or vibration absorber

Including energy absorbing means or feature

180312, 248562, 416134A, 416500, F16F 500

Patent

active

050042157

ABSTRACT:
The resilient return strut is of the elastic-hydraulic type with incorporated linear damping by throttling a high-viscosity fluid, and comprises a damper (1) mounted between two return springs (2, 3) in elastomer-based sleeves (17, 18), undergoing a shearing action and sealing the chambers (34, 35) set off within the body of the damper (12) by a transverse wall (10) which marks off a permanent throttling passage around a central brace (23). Limiting valves equipped with spring-leaves (45) sealing the holes (40) bored in the wall (10) increase the throttling section. A compressed-air system (52), mounted in a spring (2), compensates for thermal expansion of the fluid. The device is used with helicopter rotors.

REFERENCES:
patent: 2919883 (1960-01-01), Murphy
patent: 3314600 (1967-04-01), Hadley
patent: 3361216 (1968-01-01), Walker
patent: 3595349 (1971-02-01), Ortheil
patent: 3698284 (1972-10-01), Toering et al.
patent: 4401298 (1983-08-01), Eaton et al.
patent: 4566677 (1986-01-01), Pierres
patent: 4643139 (1987-02-01), Hargreaves
patent: 4733854 (1988-03-01), Miyamoto
patent: 4741521 (1988-05-01), Schiffner et al.

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