Device for reducing the flexibility of an oleo-pneumatic shock a

Details Device for reducing the flexibility of an oleo-pneumatic shock a Device for reducing the flexibility of an oleo-pneumatic shock a

1990-05-16

1992-03-10

Barefoot, Galen

Aeronautics and astronautics

Landing gear

Wheel

267 6426, B64C 2560

Patent

active

050944070

ABSTRACT:
The invention relates to a device for reducing the damping flexibility of a suspension shock absorber for an undercarriage, in particular the main undercarriage of a helicopter, and a shock absorber and an undercarriage including it.
The shock absorber is of the oleo-pneumatic type, and at least one of the incompressible and compressible fluids of the shock absorber is at least partially transferred from an expansion chamber (31) of the latter into a transfer chamber (42) of an accumulator (40) external to the shock absorber (1, 8), and in which the transfer chamber (42) is isolated from a return chamber (43) by a separating piston (41). The connection between the transfer chamber (42) and the corresponding expansion chamber (31) can be cut off by an electro-valve (44), in order to isolate the shock absorber (1, 8) from at least part of the low pressure gas chamber (34) of its expansion chamber (31).
Application to the undercarriage equipment, in particular the main undercarriages of ship-borne helicopters.

REFERENCES:
patent: 2698751 (1955-01-01), Nye et al.
patent: 3290037 (1966-12-01), Robinson et al.
patent: 4524929 (1985-06-01), Gebhard
patent: 4630788 (1986-12-01), Veaux et al.
patent: 4720085 (1988-01-01), Shinbari et al.
patent: 4886248 (1989-12-01), Delhaye et al.

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