SU175401A1 - Pneumatic hydraulics - Google Patents

Description

Pneumohydraulic springs for vehicles are known, comprising: a main cylinder filled with liquid and compressed gas; a cover fixed to its lower end and serving as a lower spring support; a housing enclosing the main cylinder and forming an annular reservoir for collecting the working fluid; a plunger pump with a spring oscillation drive O1, located inside the main cylinder; an overflow channel connecting the high pressure cavity of the main cylinder to the plunger pump and the reservoir for collecting the working fluid; a backpressure cylinder, terminally positioned in the main cylinder, filled with compressed gas and working fluid and connected to an annular cavity between the main cylinder and the backpressure cylinder through calibrated orifices and a check valve designed to dampen vibrations, and a lid mounted on the upper end of the counterpressure cylinder and serving simultaneously upper support springs.

In the described spring, in order to prevent the working fluid and compressed gas from leaking from the main cylinder to the reservoir to collect the working fluid when the spring is extended and thereby improving the reliability of the spring, a valve is adjusted to the minimum allowable pressure in the high pressure cavity of the main cylinder. It is located in the cavity of this cylinder and connects it with the working cavity of the plunger pump.

FIG. 1 and 2 schematically shows the device of the pneumatic head spring.

Attached to the bottom cover / spring are the main cylinder 2, body 3, covering

the main cylinder and forming the annular reservoir to collect the working fluid, and the housing 4 of the plunger pump. It has the same dimensions (, Yen valves - charging 5, suction 6 n discharge 7, and also bypass channel 8. In the upper spring cover 9 there is a counterpressure cylinder W and a charging valve 11. The cavities A of the main cylinder and B of the counterpressure cylinder are separated by a piston 12 to which

attached to the plunger 13 of the pump.

The lower part of these cavities is filled with a working fluid, and the top - with gas. The piston has a calibrated orifice 1-4 and a damper check valve 15. Upper

Part of the spring is connected to the frame of the car, and the lower part - with the beam of its bridge.

When compressed, the gas that is located in cavity 13 A of the main cylinder is compressed, the working fluid is discharged through cavity B through calibrated pressure, and the gas pressure in cavity B decreases.

As the gas is withdrawn, the pressure in cavity A decreases, as a result of which the working fluid flows from cavity B through calibrated orifice 14 into cavity B, and the pressure of gas in cavity B increases. In this case, the damper valve is closed.

The constancy of the height of the car body is adjusted by means of a plunger pump consisting of a pump casing 4 and a plunger 13 driven by spring oscillations. When the load on the pump spring is reduced, along with the piston 12, there is no upward movement. When the plunger moves higher than the hole 16, the working core of the bottom L is through the safety valve 17, the vertical pump channel and the hole 16 enters the cavity G under the pump plunger and then through the hole 18 the vertical pump channel, the hole 19 and the non-repetitive channel 8 do not flow into the width atmospheric pressure D. In this case, the gas pressure in cavity A drops, the plunger of the pump with the piston moves downward, preventing the opening 16. The initial height of the car body is restored when the spring oscillates during driving vehicle.

During withdrawal, the plunger of the pump moves upwards and through the suction valve 6 the working fluid flows from the cavity of atmospheric pressure D into the bed | G under n; ty} izherom pump.

When compressing, the plunger of the pump moves downwards through the pressure clanan 7 and the vertical channel 20 supplies the working fluid from the pump section G to the cavity A of the main cylinder. This pressure of the gas in the cavity L increases, resulting in the pump plunger, together with the well, is 1 m higher than its former level. Thus, n;) after a certain number of oscillations of the suspension, the neural height of the car body is fully restored.

When the oscillation amplitude of the spring does not increase the distance between the openings 16 and 18, the working fluid circulates freely between the cavities D and G. This valve 6, 7 VI 17 does not work.

As the load on the spring increases, the plunger 13 of the pump together with the piston 12 moves downwards. When lowering the pump plunger below the hole 18, the working fluid from the floor G under the pump plug through the pressure clan 7 and the vertical channel 20 enters the cavity L of the main cylinder. When the bridge of the car is broken down, the pump pump moves up and opens the opening 16. In this way, the working fluid flows from the floor of L through the safety valve 17, the opening 16, the cavity G, the openings

18, 19 and channel 8 into the cavity of atmospheric pressure D. Clanan 17 is adjusted in such a way that when pressure decreases in the amount of L to a certain limit, it closes, preventing leakage of the working fluid and gas

from the cavity L.

Subject invention

A pneumatichydraulic spring predominantly for vehicles, comprising a main cylinder filled with liquid and compressed gas serving as the main resilient element, a lid fixed to the lower end of the main cylinder and serving as the lower spring support, housing enclosing the main cylinder and forming an annular reservoir for collecting the working fluid , nlun; "black pump with a spring oscillation drive, located inside the main cylinder; A non-conduit channel connecting the cavity of a high pressure main cylinder with a plunger pump and a reservoir for collecting the working fluid, a back pressure cylinder, concentrically located in the backflow cylinder, filled with compressed gas and working fluid and connected to the annular base between the main cylinder and the back pressure cylinder through calibrated orifices and non-return valve, pre-designed for damping oscillations, a lid fixed on the upper end of the backpressure cylinder and at the same time serving as the upper one a spring swarm, characterized in that, in order to prevent leakage of the working

fluid and compressed gas from the basics of the south cylinder to the reservoir for collecting the working fluid with extended spring, it is equipped with a valve adjusted to the minimum allowable pressure in the high pressure cavity;

the main cylinder installed in the cavity of this cylinder and connecting it to the working floor of the plunger pump.