The shock absorber chassis of the aircraft and the method of filling the hydraulic chamber of the shock absorber chassis of the aircraft

IPC classes for russian patent The shock absorber chassis of the aircraft and the method of filling the hydraulic chamber of the shock absorber chassis of the aircraft (RU 2057687):

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 aircraft and is intended for use as a shock absorber sessile aircraft /L. a./. The aim of the invention is the reduction of weight and dimensions, as well as limiting peak loads, improve reliability, to prevent the formation of air pockets in the hydraulic chamber and the safety when pouring liquid in operation. The shock absorber chassis /L. a./ contains cylinder 1 with the top 2 and bottom 3 values, the rod 4 with the panel Jack 5 in the upper part of the Cup 9 with the charger, camera extension tube placed in stock with the formation of the annular chamber and fixed in the cylinder 1. In a glass 9 installed floating piston 10, in the bottom of the Cup 9 is installed aperture 11 that communicates its upper part with a floating piston 10, and in the upper part of the diaphragm 11 is made grooves and annular chamber installed fixed on the glass sleeve 12 with throttling holes 13 forward and reverse moves, and also with holes and annular grooves, telling her the cavity through the holes drilled in the glass with the inside of the glass, and designed to contain knowlen jellied tube 7, and in the corresponding cylinder bore, in which is installed a breather 8, in the lower part of the stem is installed charging tube compression chamber. Buchs 5 of the stem 4 is made with a support belt and secured in the rod against axial movement by a nut, and from rotation relative to the shaft is keyed or radial bolted connection. The method of filling the hydraulic chamber of the shock absorber chassis of the aircraft provides the drain pressure of the gas chambers, the fill fluid and the subsequent restoration of the pressure in this first release the pressure from the compression chamber, then from the expansion chamber remove the breather 8, then Unscrew the ring fill plug 7 and serves the gas pressure in the chamber extension, then pour the liquid into the chamber through the filling tube 7 with the installation of the tube. 2 S. and 2 C. p. F.-ly, 1 Il.

The invention relates to aircraft and is intended for use as a shock absorber chassis of the aircraft.

Known shock absorber, which is the closest technical solution containing cylinder with upper and lower values, stem with panel Jack at the top, a glass of charging the camera extension tube placed in stock with the formation of the x hydraulic chambers, creating hydraulic resistance to movement of the rod on the forward or reverse moves. Luggage hydraulic braking forward stroke creates a hydraulic resistance to the movement of the rod when a direct stroke and does not create in the reverse, and the annular chamber creates hydraulic resistance only during the reverse stroke.

The presence of two hydraulic chambers increases the size and weight of the absorber. In addition, when filling chambers of the shock absorber is drain the pressure from the gas chambers, and then perform the fill fluid and the subsequent pressure recovery.

The aim of the invention is the reduction of weight and dimensions, as well as limiting peak loads, improve reliability, to prevent the formation of air pockets in the hydraulic chamber and the safety when pouring the liquid into the operation.

The specified goal in the shock absorber chassis of the aircraft, containing a cylinder with upper and lower values, stem with panel Jack at the top, a glass of charging the camera extension tube placed in stock with the formation of the annular chamber and fixed in the cylinder is achieved by the fact that the glass has a floating piston in nizhneyenisei portion of the diaphragm is made grooves, and in the ring the camera is mounted fixed on a glass sleeve with throttling holes forward and reverse moves, and also with holes and annular grooves, telling her the cavity through the holes drilled in the glass, with an inner cavity of the Cup, and intended for placement of valve reverse braking, while Buchs rod fixed against rotation relative to the stem and it has jellied tube, and the cylinder is made corresponding bore in which is installed a breather, and in the lower part of the stem is installed charging tube compression chamber.

In addition, the purpose of the invention is achieved by the fact that Bush rod is made with a support belt and secured in the rod against axial movement by a nut, but from rotation relative to shaft keyed.

The purpose of the invention is also achieved by the fact that Bush shaft fixed against rotation relative to shaft radial bolted connection.

The purpose of the invention when filling the hydraulic chamber of the shock absorber, which is performed by the grazing pressure of the gas chambers, the fill fluid and the subsequent restoration of the pressure is achieved by the fact that the first release the pressure from camera in the camera extension, then pour the liquid into the chamber through the fill plug with the installation of the tube.

The drawing shows the construction of the shock absorber.

It consists of a cylinder 1 with the top 2 and bottom 3 values. Inside the cylinder 1 has a piston rod 4, in the upper part of which is installed Buchs 5, secured by a nut 6. In buochs installed jellied tube 7, which when compressed the shock through the hole in the cylinder wall 1, in which the breather 8. Inside the stem 4 has a Cup 9, which contains a floating piston 10. At the bottom of the Cup 9 is installed aperture 11 with the slots in the upper part. At the top of the Cup 9 has a gas chamber a And in the lower part of the hydraulic chamber C. In the annular cavity between the rod and Cup set, is fixed to the glass sleeve 12 with throttling holes 13. On the inner surface of the sleeve 12 has two annular undercut. In the wall of the lower part of the sleeve 12 has openings for the passage of fluid.

The sleeve 12 is pressed against the diaphragm 11 through the stop 14, which is required for proper placement of the valve reverse brake 15. In the wall of the Cup 9 holes 16 that report vnutrennyaya installed charging tube 17, 18 in the Cup and the stem. The joints of the axle box 5 glass 9 and the rod 4, the floating piston 10 and the glass 9, the diaphragm 11 with the rod 4, the charging tubes 16, 17 with a glass 9 and the rod 4 is equipped with hermetic seals. The Cup 9 is fixed against axial movement by a nut 19.

The presence of grooves on the diaphragm 11, the holes 16 in the walls of the Cup 9 and the sleeve 12, the stepped shape of the cylindrical portion of the diaphragm 11, the placement of the upper end of the stop aperture 11 in the area of the holes 16 of the Cup 9, allows you to communicate between all the internal cavity of the hydraulic and the annular chamber and to ensure their fill without the formation of air cavities.

For fixing the position of the tube 7 relative to the openings 8 in the cylinder 1, thereby providing access to the tube when fully compressed shock absorber, Bush 5 is fixed from rotation relative to the shaft 4 (e.g keyed or screwed or friction forces).

The shock absorber works as follows. When a direct stroke fluid from the hydraulic chamber In under the action of gas pressure in the chamber expansion And throttled through the holes 13 in the annular chamber which is formed by the glass 9, the rod 4, panel Jack 5 and the diaphragm 11, creating the necessary hydraulic resistance pressure drop at the throttling holes is limited by the pressure in the chamber extension A. Therefore, one of the conditions determining the pressure of the charge chamber expansion And is providing the required hydraulic drop during forward shock absorber, providing energy absorption landing a blow for permissible loads.

The above feature of the shock absorber allows you to limit the maximum load on the L. A. characteristic of the compression chamber, which increases the security of L. A. characteristic of the compression chamber, which increases the security of L. A. in the case of rough landings and moving irregularities in the process of takeoff and landing.

During the reverse stroke of the shock absorber valve reverse brake 15 fluid flow moves up and overlaps the vertical throttling hole 13. Fluid from the annular chamber will grossulariata into the cavity of the Cup only through the side throttling hole 13, providing the necessary braking rod.

The presence of floating piston separating the gas and liquid in the chamber extension provides a submerged position of the sealing of the packages on PTC site 5 and the diaphragm 11 both in flight and at rest, which significantly increases the reliability of the sealing of movable joints, does not require the installation of pressure relief device due to the lack of dissolution of gas in the hydraulic fluid chamber C. The presence of a breather, performing the functions of a safety relief valve prevents pressure increase in the cavity of the cylinder during operation of the shock absorber.

To ensure reliable filling of hydraulic and annular chambers with fluid, fill it as follows.

The shock absorber is crimped to the end, removed the breather 8 and through the opening in the wall of the cylinder 1 come unscrewed jellied tube 7, applying pressure to the cavity expansion chamber And a floating piston emphasis is placed on the diaphragm 11 and the through hole of the stopper 7 in buochs 5 hydraulic chamber is filled with fluid.

After pouring tube is installed in the hole of the axle box, and a breather in the bore of the cylinder.

1. The shock absorber chassis of the aircraft, containing a cylinder with upper and lower values, stem with panel Jack at the top, a glass of charging the camera extension tube placed in stock with the formation of the annular chamber and fixed in the cylinder, characterized in that, in order to reduce weight and size, as well as the limitations of peak loads and improve reliability, the glass has a floating piston at the bottom of the glass of the aperture that communicates its upper part is slowly on the glass sleeve with throttling holes forward and return strokes, and also with holes and annular grooves, telling her the cavity through the holes drilled in the glass, with the inside of the glass, and designed to contain the valves reverse braking, while Buchs rod fixed against rotation relative to the stem and it has jellied tube, and the cylinder is made corresponding bore in which is installed a breather, and in the lower part of the stem is installed charging tube compression chamber.

2. The shock absorber under item 1, characterized in that the Bush stem is made with a support belt and secured in the rod against axial movement by a nut, but from rotation relative to shaft keyed.

3. The shock absorber under item 2, characterized in that Buchs rod fixed against rotation relative to shaft radial bolted connection.

4. The method of filling the hydraulic chamber of the shock absorber chassis of the aircraft, providing the drain pressure of the gas chambers, the fill fluid and the subsequent pressure recovery, characterized in that, in order to prevent the formation of air pockets in the hydraulic chamber and safety when pouring liquid in operation, first, the country is ku and serves the gas pressure in the chamber extension then pour the liquid into the chamber through the fill plug with the installation of the tube.