Shock-absorber for aircraft landing gear
View Patent ↗The invention relates to a shock-absorber for aircraft landing gear, the shock-absorber having two elements mounted to slide telescopically one in the other and defining an internal volume that is filled with hydraulic fluid and with gas, the internal volume being separated into at least two chambers by a separation including at least one throttling orifice through which the hydraulic fluid passes from one chamber to the other while the shock-absorber is being compressed. According to the invention, the separation includes at least one degassing orifice to enable gas to be transferred from one chamber to the other when the landing gear is in the deployed position, the degassing orifice being offset vertically relative to the throttling orifice so as to be located above it when the landing gear is in the deployed position.
1. A shock-absorber for aircraft landing gear, the shock-absorber having two elements ( 1 , 2 ) mounted to slide telescopically one in the other and defining an internal volume that is filled with hydraulic fluid and with gas, the internal volume being separated into at least two chambers ( 7 , 8 ) by a separation ( 5 ) including at least one throttling orifice ( 10 ) through which the hydraulic fluid passes from one chamber to the other, while the shock-absorber is being compressed, wherein the separation includes at least one degassing orifice to enable gas to be transferred from one chamber to the other when the landing gear is in a deployed position, the degassing orifice being offset vertically relative to the throttling orifice so as to be located above said throttling orifice when the landing gear is in the deployed position,
wherein the degassing orifice is provided at the top end of a hollow column ( 20 ) that is carried by the separation and that opens out into the chamber ( 7 ) lying beneath the separation ( 5 ).
2. The shock-absorber according to claim 1 , wherein the column is fitted on the separation ( 5 ) and includes a collar ( 24 ) for retaining a slidably-mounted valve member ( 12 ) that co-operates with the throttling orifice ( 10 ) in the separation ( 5 ).
3. The shock-absorber according to claim 2 , wherein the column is screwed into the separation.
4. A shock-absorber for aircraft landing gear, the shock-absorber having two elements ( 1 , 2 ) mounted to slide telescopically one in the other and defining an internal volume that is filled with hydraulic fluid and with gas, the internal volume being separated into at least two chambers ( 7 , 8 ) by a separation ( 5 ) including at least one throttling orifice ( 10 ) through which the hydraulic fluid passes from one chamber to the other, while the shock-absorber is being compressed, wherein the separation includes at least one degassing orifice to enable gas to be transferred from one chamber to the other when the landing gear is in a deployed position, the degassing orifice being offset vertically relative to the throttling orifice so as to be located above said throttling orifice when the landing gear is in the deployed position,
wherein the degassing orifice is of a height such that said degassing orifice remains immersed in the hydraulic fluid, even when the chamber extending under the separation is completely filled with hydraulic fluid.