SU897597A1 - Pneumo-hydraulic resilient member - Google Patents

Description

(54) HYDROPNEUMATIC ELASTIC ELEMENT

one

This invention relates to the construction of resilient elements for vehicle suspension.

A hydropneumatic elastic element comprising a cylinder, a hollow rod, a working and expansion cavity, a pump built into the cylinder for automatically compensating for fluid leaks from the working cavity, valves and channels connecting the pump cavities to each other, one of the pump cavities with the working cavity, and the other - with an expansion cavity I.

A disadvantage of the known elastic element is the presence of an additional cavity with high pressure, which reduces its reliability and durability.

The purpose of the invention is to increase the reliability and durability of the hydropneumatic elastic element.

This goal is achieved by the fact that the pump is two-stage and includes a housing with a channel for the passage of fluid and two consecutive pistons forming a high and low pressure cavity with the housing, and a jumper is rigidly fixed to the hollow stem to interact with one of the pistons.

The pump pistons are made of different diameters, and the valve installed in the channel connecting the low pressure cavity to the expansion chamber is aligned with the throttle.

FIG. 1 shows a hydropneumatic 5 elastic element, axial section; in fig. 2 - valve design combined with a throttle; in fig. 3 is the same, view A in FIG. 2

Claims (3)

The elastic element contains a cylinder 1 underneath which is closed by a cap 2, in which a valve 3 is placed for filling a hydropneumatic elastic element with liquid, and a telescopically hollow rod 4 interacting with the main cylinder, and a valve 6 for refueling with gas by a hydropneumatic j tical elastic element , the piston 7 is attached to the hollow brush with a valve 8 of a hydraulic shock absorber built into the elastic element. The housing 9 of the two-stage piston pump is rigidly connected to the main cylinder, 20 has a channel 10 that connects the low pressure cavity B of the piston pump through a normally open valve 11, combined with a throttle, pipe 12 with an expansion cavity B in the guide 13, and also several diametrically openings 14 connecting the working cavity D with the subpump cavity D of the pump. The pistons of the pump 15 of larger and 16 smaller diameters have radial 17 and axial 18 channels, closed by valves 19, pressed by springs 20, providing the necessary pressure differential between cavity B and high pressure cavity E of the pump. A seal 21 of the hollow rod 4 is placed in the guide 13. A choke 22 is rigidly connected to the hollow stem 4. A radial 23 and axial calibrated bore 24 are made in the valve 11, which is combined with the throttle. The cavity between the piston 7 and the guide 13 is connected with working cavity 7 through the channel 25. Hydropneumatic element works as follows. During the dynamic passages of the hollow stem 4, fluid from the working cavity G under pressure leaks through the gap between the hollow stem 4 and the guide 13 and enters the expansion cavity B. As a result of fluid leaks from the working cavity, the height of the elastic element decreases, therefore, the distance between the throttle body decreases by a jumper 22 and a piston rod 16. With a certain course of compression, the throttle bridge 22 moves the piston 16 down and the pressure in cavity E increases. When the pressure in the cavity E and G reaches the value for which the spring 20 is designed, valve 19 opens and fluid from the cavity E through the radial holes 17 is injected into the working cavity G, thereby recovering OGGr. HH: Grush: I Tb T The piston 15 moves downwards , as a result, the liquid from the expansion annular cavity B through the pipeline 12, the open valve 11 and the channel 10 enters the cavity B of the pump. The resultant discharge in the cavity is eliminated by the entry of air into the cavity from the atmosphere through the seal 21, which is intended to prevent fluid leakage. When the hollow rod 4 moves upwards, the throttle bridge 22 comes out of contact with the piston rod 16, and the pistons 16 and 15 begin to move upward due to the force generated by the pressure in the working cavity G on the pistons of different diameters. At the same time, due to the pressure difference in front of and behind the valve 11, it closes and closes the orifices 23 in the valve. The volume of cavity B is somewhat larger than the volume of cavity E, and an excess of fluid flows through the throttle orifice 24 of valve 11, while an overpressure is created in cavity B, opening valve 19 in the reservoir 15, and the fluid flows through the radial 17 and axial 18 channels into cavity E, in which discharge occurs when the pump pistons move. The overpressure in cavity B contributes to reducing the speed of moving the pistons 15 and 16 of the pump upwards and eliminating the cavitation effect in the cavity E as a result. The seal 21 of the hollow rod 4 is unloaded from the high pressure of the fluid in cavity G due to the presence in the guide 13 of the expansion ring cavity B increases the reliability and durability of the elastic element. During takeoff, the valve 8 moves downwards. The channel 25 is located in the zone of the valve 8. Fluid from the cavity between the piston 7 and the guide 13 flows into the working cavity G. The proposed elastic element improves reliability and durability of the suspension, Invention I. Hydropneumatic elastic element containing a cylinder, a hollow rod , working and expansion cavities, a pump built into the cylinder to automatically compensate for fluid leaks from the working cavity, valves and channels connecting the pump cavities to each other, one of the ways of using the nnvvoste pump - with a working cavity, and the other - with an expansion cavity, characterized in that, in order to increase the reliability of the hydropneumatic elastic element, the pump is dvuhtopencha-- "housing with a channel l pro ™ fluid and two consecutive pistons forming the corpus" about high and low pressure, ° C; a choke jumper is rigidly fixed to interact with one of the pistons, 2. An element according to claim 1, characterized in that, in order to return the pump pistons to their original position, the latter are made of different diameters. 3.Item on PP. 1 and 2, characterized in that, in order to increase durability by eliminating cavitation during the filling of cavities with liquid, the valve installed in the channel connecting the low pressure cavity to the expansion cavity is combined with the throttle. Sources of information taken into account during the examination 1. US Patent No. 3033556, cl. 267-64, published. 1962. / J eleven 12 FIG.