SU1572885A1 - Pneumatic suspension - Google Patents

Abstract

The invention relates to a running gear of railway vehicles, in particular to their suspensions. The purpose of the invention is to increase the reliability of the suspension. The suspension includes upper 1 and lower 2 bases, a rubber-cord shell 3 fixed between them, a pre-compressed set of rubber-metal elastic elements 4 with a central hole, mounted inside the air suspension on the lower base 2, a cup 5 located on the upper base 1 coaxially with a set of rubber-metal elements 4 , the lower free end of which is lowered below the level of the upper bearing surface of the set of rubber-metal elements. The pre-compression of the set of rubber-metal elements 4 is carried out with the help of a pressure washer 6 supported by shoulders on the upper part of the rubber-metal elements 4 and a flexible rod 7 which is attached to the lower bottom of the air suspension. Between the set of rubber-metal elements 4 and the cup 5 there is a radial clearance E ₁ , the size of which is less than the radial clearance between the vertical guides of the lower 2 and upper 1 bases. 1 hp f-ly. 2 Il.

Description

The invention relates to a running gear of railway vehicles, in particular to their suspensions.

The purpose of the invention is to increase the reliability of the suspension.

FIG. Figure 1 schematically shows the air suspension of a vehicle; in fig. 2 - suspension characteristic.

Suspension contains upper 1 lower 2 bases, rubber-shell shell 3, fixed between them, before

A compressed rubber-metal elastic element 4 with a central hole installed inside the pneumatic spring on the lower base 2, a cup 5 located on the upper base 1 coaxially with a set of rubber-metal elements h, the lower free end of which is omitted Below the level of the upper support

rubber metal surfaces30

ical elements. The precompression of a set of rubber-metal elements k is carried out using a pressure washer 6 supported by shoulders on the upper part of rubber-metal elements 4 and a flexible rod Jt which is attached to the lower bottom of the air suspension. The magnitude of the preliminary compression P0; To the set of rubber-metal products k is chosen from the conditions:.

40

4Р-7-- К-Р

ST

where PCT is the static load attributable to the suspension; K - maximum coefficient

vertical dynamics of a sport vehicle.

The vertical dynamics coefficient is defined as the ratio of the dynamic load Rdc acting on an elastic element in the course of the vehicle movement, to the static load Rstpo formula

... R AMN to - c.

G ST

With such a dependence of the preliminary compression of rubber-metal elements from the static load

0

five

0

five

thirty

40

50

55

the required progressive characteristic of the restoring force within the horizontal course of the air suspension movement is provided. This is also facilitated by the appropriate selection of the geometric shape, size and number of rubber-metal elements in the set. Between the set of rubber-metal elements 4 and the glass 5 there is a radial clearance E1, the size of which is less than the radial clearance L between the vertical guides of the lower 2 and upper 1 bases, i.e. . F. & The inside of the glass within the working amplitudes of the oscillations is cylindrical, and beyond these amplitudes, during compression, it is conical, which ensures the centering of the upper base of the air suspension relative to the lower one with the loss of the working air pressure.

Air suspension operates as follows.

In the presence of air pressure inside the air suspension, under the action of an external horizontal force Q, the upper base 1 is displaced relative to the lower base 2. At the same time, the displacement is initially made within the free gap Ј h between the sets of elements 4 and the cup 5. Characteristic of the body connection with the carriage at this offset value it is soft and determined by the elastic properties of the pneumatic suspension itself: a rubber-cord shell 3) internal air pressure P0 and a different area of the rubber-cord shell 3 against the vertical apravl yuschim bases 1 and 2 (FIG. 2).

After selection of the gap Ј, the set of elements k, operating on the shift, is included. The movement of the upper part of the compound, through which contact is made with the 5S cup, occurs by the & l - Ј.,, i.e. until the vertical guides of the upper and lower bases touch each other. A rigid characteristic of the pneumatic spring is realized in this section of displacement (Fig. 2). At the moment of loss of air working pressure P0 inside the air suspension, the set of elements, interacting with the conical part of the bowl 5, centers the upper base 1 relative to the lower base 2 and fully provides the elastic connection of the body to the trolley, both in the horizontal and vertical planes.

Claims (2)

Claims 1. Pneumatic suspension, predominantly of a rail vehicle, comprising a transport associated with a truck body and frame This means a rubber-cord element inside which there is a shock absorber, characterized in that, in order to increase reliability, the shock absorber includes a cup mounted on the body, with the possibility of extending a package of rubber-metal elements vertically mounted on the frame of the trolley; . 2. Suspension according to claim 1, characterized in that the upper part of the package of rubber-metal elements and the inner surface of the glass are made with conical surfaces of the same taper. P, KSC j Aw