RU2591112C2 - Pneumatic vibration-isolating support - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to machine building. Pneumatic vibration-isolating support comprises a cover with a baffle plate, hollow piston and flexible tube. Baffle by its end enters cavity of piston with a gap. Gap corresponds to maximum horizontal movements of cover relative to piston. Tip of baffle is removable.

EFFECT: higher reliability, simplified design and assembly.

1 cl, 3 dwg

Description

The invention relates to the construction of vibration isolators, namely, hollow rubber elements, fixed with metal reinforcement and reinforced with cord, operating under overpressure.

Known pneumatic support (patent RU 2010128, F16F 9/04, publ. 30.03.94), containing two interconnected base with stops, discs with protrusions, a base plate and at least two rubber-cord shells. Discs with protrusions limit the movement of the stops, as a result of which the known pneumatic support has a non-linear load characteristic: the horizontal movements of the parts of the pneumatic support are proportional to the horizontal forces acting on the pneumatic support, not in all modes of its operation.

A disadvantage of the known pneumatic support is the design complexity due to the provision of a stable middle position of its base, which is necessary only in specialized machines and mechanisms and requires the inclusion of at least two rubber-cord shells and the connection of two bases with additional connecting elements.

The closest in technical essence and the achieved technical result to the claimed pneumatic vibration isolating support is an air spring assembly with a piston (US patent 5382006, B60G 15/00, publ. 17.01.95) containing a piston with a cap, a flexible sleeve and an upper retainer, when This hole in the piston is made for the passage of air, and the piston and the upper retainer are connected with mating elements with spring through threaded holes. A chipper is also attached to the upper retainer to limit the deformation of the flexible sleeve during large movements of the upper retainer.

A disadvantage of the known air spring is its low reliability due to the loss of stability of the flexible sleeve when operating in off-design conditions. The loss of stability of the flexible sleeve in off-design modes is due to the fact that the load characteristic of the known air spring in all modes of its operation is linear, that is, the movement of the cap relative to the piston caused by external forces in all operating modes is proportional to these forces. As a result of this, significant external forces acting on the known air spring at off-design modes of its operation cause significant movement of the cover, as a result of which the flexible sleeve is substantially deformed and loses stability, as a result of which the known air spring breaks down.

The technical result of the claimed pneumatic anti-vibration mount is to increase its reliability.

A pneumatic vibration isolating support containing a cover with a chipper, forming an internal cavity of a pneumatic vibration isolating support, a hollow piston and a flexible sleeve, characterized in that the chipper at its end enters the piston cavity with a gap corresponding to the maximum horizontal movements of the cap relative to the piston.

The technical result is achieved in that the maximum displacement of the cap relative to the piston in the horizontal direction is limited by the gap between the piston and the cap chipper, and in the horizontal and vertical direction at the same time, by the length of the cap chipper when a removable tip is attached to the chipper.

The essence of the technical solution is illustrated by the following drawings:

FIG. 1 - pneumatic anti-vibration mount, General view;

FIG. 2 - pneumatic vibration isolating support during operation;

FIG. 3 - load characteristic of a pneumatic vibration isolating support in horizontal and vertical directions.

The pneumatic vibration-isolating support (Fig. 1) consists of a cover 1, a hollow piston 2 and a flexible sleeve 3, while the internal cavity of the pneumatic vibration-isolating support is connected to the internal cavity of the piston 2 by a hole in its upper part, into which the fender 4 with a removable tip enters the gap 5 mounted on the lid 1.

The inventive pneumatic vibration isolating support operates as follows.

Air is supplied into the internal cavity of the pneumatic vibration isolating support at a pressure higher than atmospheric, which inflates the flexible sleeve 3, giving it stability. During operation of the pneumatic vibration isolating support, external forces Q act on the elements mating with the pneumatic vibration isolating support without a certain periodicity and move them relative to each other with a large amplitude, as a result of which the cover 1 and the hollow piston 2 are also mutually displaced, deforming the flexible sleeve 3. Deformation of the flexible sleeve 3, maintained by him without loss of stability, is the design mode of operation of the claimed pneumatic vibration isolating support. The length of the bump 4 and the size of the gap between the bump 4 and the hollow piston 2 are selected so that when the pneumatic vibration isolating support is operating in the calculated modes, the bump 4 does not limit the working displacements d of the cover 1 relative to the hollow piston 2, and they remain proportional to the external forces Q, providing linear sections I load characteristics (Fig. 3).

When the inventive pneumatic vibration isolating support in non-design modes, the external horizontal forces Q increase, while the bump 4 of the inventive pneumatic vibration isolating support engages with the hollow piston 2, thereby limiting the maximum deformation d of the flexible sleeve 3 in the horizontal direction and provides vertical sections II of the load characteristic (Fig. 3), in which the increase in external forces Q does not increase the displacement d of the cover 1. The restriction of the movements of the cover 1 prevents the loss of ti flexible sleeve 3 (Figure 2), preventing the output of the pneumatic shock absorbers out of action when operating at off-design conditions, thereby increasing reliability.

To limit the deformation of the flexible sleeve simultaneously in the horizontal and vertical direction, a removable tip 5 is installed on the bump 4, which engages with the hollow piston 2 and restricts the maximum movement of the cover 1 relative to the hollow piston 2 depending on the length of the bump 4 (Fig. 2), which is additional increases the reliability of the pneumatic anti-vibration mount.

If there is no need to limit the simultaneous vertical and horizontal deformation of the flexible sleeve 3, the tip 5 is not installed on the bump 4, which increases the versatility of the claimed design of a pneumatic vibration isolating support.

The company has positive experience in the manufacture and use of the inventive pneumatic anti-vibration mount on various vibration equipment.

Claims (3)

1. Pneumatic vibration isolating support, comprising a cover with a chipper, a hollow piston and a flexible sleeve, characterized in that the inner cavity of the piston is connected to the inner cavity of the pneumatic vibration isolating support, while the chipper ends at its end into the piston cavity. 2. Pneumatic vibration isolating support according to claim 1, characterized in that the chipper has a removable tip. 3. Pneumatic vibration isolating support according to claim 1, characterized in that on the cover and on the base of the piston protrusions are made with diameters equal to the diameters of the mounting points of the pneumatic vibration isolating support.

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