The shock absorber chassis of the aircraft

IPC classes for russian patent The shock absorber chassis of the aircraft (RU 2051073):

B64C25/58 - Arrangements or adaptations of shock-absorbers or springs (shimmy-dampers B64C0025500000; vehicle suspension arrangements in general B60G; shock-absorbers per seF16F)

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(57) Abstract:

The invention relates to aeronautical engineering, namely for a landing device for aircraft. The purpose of the invention improve the stability and reliability of the shock absorber during the reverse stroke. The shock absorber chassis of the aircraft includes a housing 1, which has a shaft 2 with a fixed sleeve 4, in which the calibrated hole and the groove 6. The sleeve 4 is made detachable, consisting of two parts, fixed against displacement relative to each other and relative to the rod 2. In the groove 6 set the anchor and the sealing ring. The support ring placed in the groove above the sealing ring with the possibility of interfacing with the inner surface of the housing 1 on the mobile landing and with a gap between the inner ring surface and the surface of the groove 6 and the sleeve 4. 3 Il.

The invention relates to aircraft, and in particular to devices for aircraft.

Known shock absorber chassis of the aircraft, comprising a housing in which is installed the stock, with a fixed sleeve with a calibrated hole and the groove, which has split o to the of esneh forces the rod is deformed (bent), resulting in kolisevova the clearance between the sleeve mounted on the rod and the wall of the casing of the shock absorber is constantly changing. This causes instability of the parameters during operation of the shock absorber on the braking mode of the rod in the reverse course and decrease the reliability of the shock absorber in the process of growing experience.

The aim of the invention is to improve the stability and reliability of the shock absorber during the reverse stroke.

This objective is achieved in that the shock absorber chassis of the aircraft, comprising a housing which has a stem with a fixed sleeve with a calibrated hole and groove, in which there is a split o-ring, sleeve is made detachable two parts and provided with a support ring mounted in the groove of the sleeve above the split ring with the possibility of interfacing with the inner surface of the housing of the shock absorber on the mobile landing and with a gap between the inner ring surface and the surface of the groove in the sleeve.

In Fig. 1 is a schematic diagram of the shock absorber device for braking the shaft in a reverse course; Fig. 2 and 3 shows the location of parts of the device for braking the shaft in a reverse course consists of a casing of the shock absorber 1 with the installed rod 2, with located in stock floating piston 3, and fixed on the shaft sleeve 4, in which the calibrated orifice 5 and the groove 6. The sleeve 4 is made detachable, consisting of 2 parts fixed against displacement relative to each other and relative to the rod 2. In the groove 6, formed by connecting the two parts of the sleeve 4, installed the support ring 7 and the sealing ring 8. The support ring 7 in its continuous outer cylindrical surface mates with the inner diameter of the housing 1 on the mobile landing and is located in the groove 6 of the sleeve 4 on the sealing ring 8. Between the ends of the grooves 6 and the ends of the rings 7 and 8 has a guaranteed clearance between the inner cylindrical surface of these rings and the cylindrical surface of the groove 6 has annular gap. At the bottom end in the wall of the groove 6 provided with grooves 9 for flow of the working fluid.

A calibrated orifice 5 in the top part of the sleeve 4, connects the area of the annular gap under the rings 7 and 8 with the hydraulic cavity And located in the housing 1 above the sleeve 4.

When the compression rod 2 between the bottom panel Jack 10 and the sleeve 4 is formed a cavity camera reverse brake "B". Sleeve 4 fixed on W is th brake rod 2.

In stock 2 is a gas chamber, isolated from the hydraulic cavity And the floating piston 3 with the seal. In the chamber the gas is under pressure. The operation of the shock absorber fitted with a valve reverse braking, as follows.

When the compression rod 2, the working fluid pressure in the cavity And increases and acts on the floating piston 3 and the rings 7 and 8 valve reverse braking, while the floating piston 3, falling down compresses the gas in the chamber, and the base 7 and 8 o ring under the action of pressure fluid and wall friction body 1 are pressed against the bottom face of the groove 6 of the sleeve 4. Between the sleeve 4 and the bottom panel Jack 10, formed in the cavity of the reverse brake B-flowing working fluid that is leaking by the end gap between the support ring 7 and the butt of the groove 6 of the sleeve 4 through the annular gap under the rings 7 and 8 and through the slots 9 of the sleeve 4, while section provide a flow of hydraulic fluid without braking.

During the reverse stroke, the working fluid pressure in the cavity And decreases, the floating piston 3 under the action of compressed gas in the chamber rises, displacing the working fluid from the cavity above the floating piston 3 in palatalize will be pressed against the upper end of the groove 6 of the sleeve 4 and to flow fluid from the cavity B in the cavity And will remain open only calibrated orifice 5. When the flow of fluid through a calibrated orifice 5 will occur hydraulic braking the flow, and therefore the flow of fluid from cavity B will occur with a time delay, determined by the law of the leakage of the fluid through a calibrated orifice. The slow flow of liquid from the cavity of the reverse brake B will cause a reduction in speed of the output shaft 2, providing the parameters defined for the operation of the shock absorber during the reverse stroke.

The shock ABSORBER CHASSIS of the AIRCRAFT, comprising a housing which has a stem with a fixed sleeve with a calibrated hole and the groove, which has a split sealing ring, characterized in that, to improve stability and reliability in the operation of the shock absorber in the reverse stroke, the sleeve is made detachable two parts and provided with a support ring mounted in the groove of the sleeve above the split ring with the possibility of interfacing with the inner surface of the housing of the shock absorber on the mobile landing and with a gap between the inner ring surface and the surface of the groove in the sleeve.