US 12,377,969 B2
Aircraft landing gear shock absorber strut with movable damping pin and flow restricting plate
Ian Robert Bennett, Gloucester (GB)
Assigned to SAFRAN LANDING SYSTEMS UK LTD., Gloucester (GB)
Appl. No. 18/571,061
Filed by SAFRAN LANDING SYSTEMS UK LTD., Gloucester (GB)
PCT Filed Jun. 14, 2022, PCT No. PCT/EP2022/066148
§ 371(c)(1), (2) Date Dec. 15, 2023,
PCT Pub. No. WO2022/263434, PCT Pub. Date Dec. 22, 2022.
Claims priority of application No. 21180138 (EP), filed on Jun. 17, 2021.
Prior Publication US 2024/0300640 A1, Sep. 12, 2024
Int. Cl. B64C 25/60 (2006.01); B64C 25/12 (2006.01)
CPC B64C 25/60 (2013.01) [B64C 25/12 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An aircraft landing gear shock absorber strut comprising:
an outer cylinder having an inner surface defining a cylinder bore extending into the outer cylinder from a first axial face of the outer cylinder, the cylinder bore defining an oil chamber;
a sliding tube being movably mounted within the cylinder bore so as to be movable along the cylinder bore between:
a compressed position in which a first free end portion of the sliding tube disposed outside of the cylinder bore is situated a first distance from the first axial face of the outer cylinder; and
an extended position in which the first free end portion of the sliding tube is situated a second distance from the first axial face of the outer cylinder, the second distance being greater than the first distance;
a separator piston movably mounted within a blind bore to separate a gas chamber within the blind bore from the oil chamber such that, as the sliding tube moves from the extended position to the compressed position, oil within the oil chamber forces the separator piston to move to compress the gas within the gas chamber;
one or more dynamic seals arranged within the cylinder bore between the inner surface of the outer cylinder and an outer surface of the sliding tube to inhibit oil within the oil chamber passing the dynamic seals as the sliding tube moves between the extended and compressed positions;
a damping pin; and
a flow restricting plate extending across the blind bore and having an orifice through which the damping pin axially moves as the sliding tube moves between the extended and compressed positions,
wherein the damping pin is coupled to the separator piston so as to move with the separator piston.