RU2550646C1 - Vibration isolator - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: vibration isolator has two support crossbars and set of resilient ring springs with shoulders. Ring springs with shoulders are made out of pressed wire, and are secured with each other by securing elements in pairs, and are arranged diametrically at opposite surfaces with angular displacement. The support crossbars are made as rotation bodies with two sockolets, in one sockolet thread holes are made to secure to the base and protected object, in the another sockolet helical slots are made to screw-in the screw metal spring. The spring is installed inside a set of ring springs.

EFFECT: exclusion of resonances in work range of frequencies of the mechanical system, stability of elastic and dampening properties of the vibration isolator.

5 dwg

Description

The invention relates to the field of vibration protection technology, in particular to elastic damping devices, and can be used in aerospace, as well as in any other technical field to reduce vibration loads of devices, assemblies and equipment.

Known annular spring containing an elastic ring with protrusions, pairwise and diametrically located on opposing surfaces with a displacement of them at an angle, and this spring is equipped with either an annular element rigidly connected to the protrusions of one of the sides of the elastic ring, or provided with an additional elastic ring similar to the main one, the protrusions of the rings face each other and are rigidly interconnected, the width of the additional elastic ring is equal to the width of the main one (RF patent No. 1208368, application. 23.12.83, publ. 30.01.86, bull. No. 4).

The disadvantage of the analogue is the uneven stiffness in three mutually perpendicular directions of loading, which can lead to the emergence of additional resonant modes in the operating range of the protected object.

The closest in technical essence to the claimed one is a vibration isolator, consisting of an elastic damping element of a ring type made of MP material, from two diametrically opposite sides of which fastening clips are installed, which serve to install a vibration isolator on a vibrating base and attach a protected object to it, and a reinforcing element is installed inside the ring element a package of corrugated plates (RF patent No. 986556, declared. 06.07.81, publ. 07.01.83).

The disadvantage of the prototype is the low adhesion of the reinforcing package of plates with the surrounding array of an extruded wire spiral made of MP material. In addition, an array of MP material adjacent to the ribs on the side surface of the reinforcing bag receives large plastic deformations, and the wire spirals are cut at its sharp edges.

The technical result, the achievement of which the creation of this proposed invention is aimed, is to ensure high reliability of vibration protection, which eliminates the occurrence of resonances in the working frequency zone of the mechanical system, as well as ensuring a high level and stability of the elastic-damping properties of the vibration isolator. Ensuring high reliability of the operation of the annular elastic element and improving the damping characteristics is supposed to be ensured by creating additional force from the coil spring, which unloads the vibration isolator from the static forces of the weight of the protected load (device, unit).

The technical result is achieved by the fact that in the vibration isolator containing two supporting crosses, which serve for attaching the vibration isolator to the base and to the protected object, and a set of elastic ring springs with protrusions pairwise and diametrically located on opposing surfaces with an offset along the corner, ring springs with the protrusions are made of extruded wire material and fastened together by fasteners, supporting crosses are made in the form of bodies of revolution with two bosses located in eh axis, one of which threaded holes are made for fastening to the base and a securable object, the other implemented helical grooves to screw the helical metal springs installed inside a ring springs.

The invention is illustrated by drawings, where

- in FIG. 1 shows a General view of the vibration isolator in isometry;

- in FIG. 2 shows a side view;

- in FIG. 3 shows a top view;

- in FIG. 4 shows a clip in isometry;

- in FIG. Figure 5 shows the design of a special nut used to fasten stepped annular springs from extruded wire material.

The design of the vibration isolator is a set of elastic figured rings 1 (Fig. 1, 2), made of extruded wire material. The springs 1 are rings with protrusions 2 arranged in pairs on opposite surfaces with an angle offset, for example, 60 degrees to each other. In general, the offset angle depends on the number of protrusions and can be calculated using the formula

, $$\alpha =\frac{\pi }{n}$$

,

where n = 2, 3, 4, 5, ...

In the rings 1, holes 3 are made with an angle offset of α / 2, into which the fixing nuts 4 are pressed on one side. Inside the rings 1, an additional metal coil spring 5 is installed for unloading them, screwed into the screw grooves 6 located in the bosses 7 on the clips 8 The cage 8 is a body of revolution in the form of a three-beam cross with two bosses 7 and 9 (Fig. 3, 4) located along the axis of the vibration isolator. The bosses 7 serve to connect the clips and unload the vibration isolator from the weight force of the protected object. Boss 9 are used to attach it to the base and the protected object. When assembling the vibration isolator, the spring 5 is subjected to some compressive force corresponding to a part of the object's weight force per one vibration isolator. In this state, the vibration isolator is assembled into a single whole.

To prevent rotation when assembling the elastic elements on the outer side surface of the nuts 4, knurling is performed (see Fig. 5). In addition, the nuts can be glued to the inner surface of the elastic elements 1 with glue to prevent rotation when assembling. The nuts 4 can also be made with two threads on the inner and outer lateral cylindrical surfaces, while one of them must have a left and the second a right thread (Fig. 5).

The operation of the vibration isolator is as follows. The action of a vertical load of a vibrational or shock nature, applied to the boss 9 from the side of the protected object, leads to deformation of the elastic element 5 and a set of elastic rings 1, compensating for the effect of the applied loads and dissipating (dissipating) their energy due to slipping of wires in the elastic elements, as well as in the spring 5 when it is deformed. Under axial loading, the elastic rings 1 transmit forces to each other and are subjected to bending and torsion. The conditions of deformation of all elastic rings are the same. The stability of the vibration isolator is ensured by attaching the elastic rings 1 to each other, to the supporting crosses 8 and to the coil spring 5, as well as due to the optimal ratio between the outer and inner diameters of the elastic rings, the height of the protrusions, and the density of the pressed wire material.

The possibility of carrying out the invention is ensured by the fact that all its elements can be made of known structural materials and on standard equipment.

An analysis of the prior art by the applicant, including a search by patent and scientific and technical sources of information, and identification of sources containing information about similar inventions, made it possible to establish that the applicant did not find an analogue characterized by features identical (identical) to all the essential features of the claimed utility model. Therefore, the claimed invention meets the criterion of "novelty."

To verify the compliance of the claimed invention with the condition "inventive step", the applicant conducted an additional search for known solutions in order to identify features that match the distinctive features of the prototype claimed in the invention.

The search results showed that the claimed invention does not derive explicitly from the prior art determined by the applicant for the specialist, the effect of the transformations provided for by the essential features of the claimed invention on the achievement of technical results is not revealed.

Therefore, the claimed invention "Vibration isolator" meets the criterion of "inventive step".

The present invention can be used in transport engineering, light industry, other industries. A theoretical study by the authors showed that the vibration isolator is able to provide a given level of stability of characteristics, and the design as a whole is capable of ensuring that these characteristics are maintained unchanged during operation. This proves the achievement of the technical result perceived by the applicant - ensuring high reliability of vibration protection and obtaining equal-linear linear characteristics in three mutually perpendicular directions, which eliminates the occurrence of sub- and superharmonic resonances in the working frequency zone of the vibration protection system.

Claims (1)

A vibration isolator containing two supporting crosses used to fasten the vibration isolator to the base and to the object to be protected, and a set of elastic ring springs with protrusions pairwise and diametrically located on opposing surfaces with an angle offset thereof, characterized in that the annular springs with protrusions are made of extruded wire material and fastened together by fasteners, support crosses are made in the form of bodies of revolution with two bosses located along the axis, in one of which p zbovye holes for fixing to the base and a securable object, the other implemented helical grooves to screw the helical metal springs installed inside a ring springs.

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