SU1370342A1 - Pneumatic damper - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to damping devices used in land vehicles. The aim of the invention is to increase the damping properties of the damper by equalizing the pressure in the cavity of the damper at the beginning of the compression stroke and the extraction stroke. When changing the damper strokes, the leveling valve 9, installed in the ball bearing 7 and frictionally connected with the rod, briefly communicates between the rubber-cord shells 1 and 2. f-ly, 2 silt, y

Description

with

9 C

one

The invention relates to mechanical engineering, and is referred to as damping devices used in land vehicles.

The aim of the invention is to increase the damping properties of the damper by equalizing the pressure in its cavities at the beginning of the compression stroke and the extraction stroke,

FIG. 1 shows a pneumatic damper; in FIG. 2, node I in FIG.

The pneumatic damper contains coaxially arranged conical rubber-cord shells 1 and 2, between adjacent ends of which a partition wall 3 separating them is installed, and bases made in the form of conical pistons 4 and 5 connected to each other by a rod 6 shim through the axial hole in the ball bearing 7, installed in the central hole of the partition 3. In the annular groove 8 of the ball bearing 7 coaxially to the rod 6 is installed balanced balance valve 9, which through ca 10 friktsion- but coupled with the shaft 6. The baffle 3 provided with openings 1 12 and closed by spring-loaded bypass valves 13 and 14 which are provided with adjusting devices 15 and 16 providing a resistance change valves.

In the ball bearing 7 there are radial holes, connected by channels 1 8 with rubber-cord shell 2, and in leveling valve 8, axial channels 19 and annular undercut 20. Rubber cord-shell 1 is closed with a rigid casing 21 attached to the partition 3 and equipped with a non-return valve 22.

An eyelet 23 is rigidly fixed to the piston 5.

The pneumatic damper is installed in the vehicle suspension parallel to the elastic element, the partition 3 is rigidly attached to the sprung mass, and connected to the sprung mass by means of the props of the ears 22.

one-

In the static position of the damper, regardless of the position of the leveling valve 8, the air pressure in the cavity of the rubber-cord shells 1 and 2 is approximately the same.

ten

15

20

25

thirty

35

40

50

55

rinei M, niiMecKnfi dsmsnfer works as follows.

R beginning of the compression stroke, the rod 6 together with the pistons 4 and 5 moves relative to 1 ay support 7 upwards, lift the leveling valve 8 up to the stop into the upper protrusion of the ball support 7. The radial holes 17 close, and the further compression stroke occurs when cavities are disconnected rubber cord 1x shells I, and 2. In the cavity of the shell 2, the air pressure and the effective area increase, in the cavity of the shell 1 decrease, as a result, the force of resistance to the compression stroke increases intensively. From the moment the air pressure in the damper cavity reaches the predetermined pressure drop resistance after opening the valve 13 and until the end of the compression stroke, the resistance force increases only slightly by changing the difference in the effective areas of the rubber-cord shells 1 and 2.

With the start of the take-off stroke, the rod 6 moves the leveling valve 8 down. During the passage through the middle position valve 8, the annular recess 20 coincides with the radial holes 17, while the cavities of the shells 1 and 2 are briefly communicating with each other, the air pressure in them is practically equalized. As the stroke increases, the valve 8 blocks the radial holes 17, the air pressure and the effective area in the cavity of the shell I increase, in the cavity of the shell 2 decreases, and the force of resistance to the release increases intensively. From the moment the specified air pressure drop is reached in the cavity of the damper — after opening valve 14 and until the end of the lift cycle, the increase in the resistance force is caused only by the change. the difference between the effective areas of shells 1 and 2.

The presence of the sealed casing 21 allows an increase in the damping force of the damper during the extraction period without increasing the air pressure drop in

hollow shells 1 and 2.

I

At the beginning of the next compression stroke, the valve 8, being stirred up, briefly opens the opening 17, the air pressure in the cavity of the damper is equalized, the working cycle repeats.

.3,

Claims (2)

1. Pneumatic damper containing two rubber-cord shells, a partition connected to oppositely directed ends of the rubber-cord shells, bases connected to other ends of the rubber-cord shells, relief valves placed in the partition and communicating the cavities of the rubber-cord shells, spherical support mounted on the partition mounted on the partition and a rod connected to the bases and passing through an axial bore, characterized in that, in order to see the damping properties, the ball joint is made in internal ring groove, communicated with one of the rubber-cord shells, and pa 703D2 diagonal holes communicating the groove cavity with a different rubber-cord casing, and the damper is provided with a leveling valve made in the form of an sleeve located in the annular groove, which fits and frictionally connects the rod with channels and an annular recess on the outer surface, communicated with one of the rubber-cord shells and periodically reported with radial holes. ten 2. A pneumatic damper according to claim 1, characterized in that it is provided with a rigid hermetic casing covering one of the rubber-cord shells with a base and connected to the partition, and a check valve that communicates the cavity of the casing with the atmosphere, Phi22