RU2173803C2 - Spring-loaded vibration insulator with dampening member - Google Patents

Abstract

FIELD: spring shock absorbers with loaded ropes. SUBSTANCE: steel cable is wound on spring. End of cable may be directly secured at points of attachment of spring to foundation and o supports of object and at other points of object. EFFECT: higher reliability and damping of vibration insulator. 29 dwg

Description

 The invention relates to means of protecting the structure from mechanical influences, namely to vibration isolators with an elastic damping element.

 Known vibration isolator type AKPO (ship single-coil spring shock absorber) {N. Belyakovsky Structural depreciation of mechanisms, instruments and equipment on ships. L .: Shipbuilding, 1965, 523 p. (p. 418, Fig. 162) [1]}.

 Known vibration isolator does not have a damping effect.

 Also known closest to the proposed technical solution of the vibration isolator containing the frame and wound on it in the form of a coil spring harness (USSR Author's Certificate N 315689, class F 16 F 1/06, published. 07.06.87) [2] - prototype. The tourniquet consists of twisted metal wires wound around a frame. Each of the rows of wires is twisted along a spatial helix with a volumetric interlacing of at least three rows. Each coil of a cylindrical spring is formed by a wound end-to-end bundle. The ends of the bundle are soldered to prevent spontaneous unwinding.

Significant disadvantages of this vibration isolator are:
1. Unreliability of fastening the ends of the harness.

 2. The complexity of winding wire harness.

 3. The need for special manufacturing technology.

 4. Lack of energy intensity.

 5. The insignificance of the damping effect.

 During operation of the vibration-insulated object and the effects of shock, shock, compression or extension of the spring occurs, causing torsion and bending of the wire.

The twisting and bending of the wire causes the tension of the bundle, which leads to rapid wear of the wires, breaking the bundle and the soldering itself. When the spring is working with a temperature of more than 280 ^o C, the soldering is converted to a soft and then to a liquid state.

 Therefore, the known technical solution is unreliable and not energy intensive.

 The complexity of winding (manufacturing) the harness and the need for special technology for its manufacture increase the cost of the vibration isolator.

 The design feature of the harness wires contributes to the damping effect, but they are insufficient, since the contact surface of the contact is small. This is also due to the fact that when brazing the ends, sufficient tension of the bundle and tight contact of the corresponding surfaces cannot be ensured.

 The present invention is directed to the improvement of spring vibration isolators with damping means.

This is achieved due to the fact that:
1. The damping element is made of a steel rope spiral wound around the wire of the spring itself.

 2. The means for terminating the ends of the damping element is also a means of attaching its ends directly to the points of attachment of the spring to the foundation and to the supporting structures of the object or other points of this object.

 This technical solution is illustrated by drawings, where in FIG. 1 shows a spring vibration isolator without a damping element; in FIG. 2 - spring vibration isolator with a damping element, mounted between the vibration insulated object and the foundation (frame); in FIG. 3 - same, top view; in FIG. 4 to 27 are some examples of means for terminating a damping element; in FIG. 28, 29 are examples of fastening the ends of the damping element.

 A spring vibration isolator with a damping element comprises a coil spring 1 (Fig. 1 - 3), which for simplicity depicts a single-turn design (special case), eyelets 2, 3 for fastening on one side to a vibration-proof object 4, and on the other hand - to the foundation or frame 5 (Fig. 1 - 3), the damping element 6 and the termination means 7, 8 and fastening the ends of the damping element 6.

 Means 7, 8 of the termination and fastening of the ends of the damping element 6 provide fastening of its ends directly in the places of attachment of the spring 1 to the foundation 5 (Fig. 2, 3) and to the supporting structures of the object 4 or other points of this object (Fig. 28, 29).

 In FIG. 2, 3 shows an example of fastening a spring vibration isolator with a damping element using fastening means 9-12 nodes 2, 3, 7 and 8.

 Part 13 (Fig. 2) is made of rubber and acts as a buffer for impacts.

 The steel rope is a twisted flexible product made of steel wires. In accordance with the specific features of the structure, it can be used as an elastic damping element of vibration isolators.

 The wire rope is made of high-quality carbon structural steel, made in open-hearth and electric furnaces.

 The rope is manufactured by industry, and therefore, is an affordable material for the manufacture of a vibration isolator of the proposed design as an environmentally friendly product.

 The working parts of the rope segments in various designs, including the proposed one, have the required bearing capacity and great damping. During loading, they undergo bending, torsion, and compression deformations in structures. They withstand vibration and linear overloads well, withstand repeated impacts of high intensity lasting 0.05-0.1 s. They have an absorption capacity close to spring vibration isolators, and in dispersing they surpass metal rubber {Minasyan MA New in the design of vibration isolating mounts for internal combustion engines. The deposited manuscript at the Central Research Institute named after Krylova, N DR-77, 1999 [3]}.

 When assembling a spring vibration isolator with a damping element for both the prototype and the proposed design, the reliability of the connection at the points of fastening of the ends 7, 8 of the damping element 6 is important and decisive (Fig. 2, 3).

 The proposed means for terminating rope segments and some examples of structural embodiments shown in FIG. 4-27, are the most reliable than the soldering of the tourniquet directly to the spring of the prototype.

 In addition to the presented means of termination (Fig. 4-27), can also be used, for example, marine nodes and other structural solutions. The main thing is to prevent spontaneous unwinding of the damping element 6, the density of winding, the reliability of the means 7, 8 of the termination and fastening of the ends of the damping element directly at the points of attachment 11, 12 (Fig. 2, 3) of the spring 1 to the foundation 5 and to the supporting structures 9 object 4 or other points of this object (Fig. 28, 29).

 This technical solution also provides adjustment of the damping characteristics of the vibration absorber due to the possibility of changing the angle, density, completeness of winding, cable length and the location of the cable ends.

 Spring vibration isolator with a damping element operates as follows.

 When the vibroinsulated object 4 from vibration and shock from both the side of the object 4, and from the side of the base 5, both low and high frequencies are attenuated due to the spring 1 itself, which does not have a damping effect.

 The damping effect is provided by the damping element 6, made of a steel rope rope due to elastic deformation and internal (viscous) friction in the material of the wires and external (dry) friction between the wires of the wire strands, as well as between the coil of spring 1 and the cable rope (Fig. 2, 3).

 At large amplitudes of vibration, the degree of damping increases sharply, which ensures a minimum coefficient of dynamism at the resonant frequency.

 Upon impact, the rubber element 13 acts as a buffer.

 Cylindrical springs are used as vehicle suspensions and, since they do not have a damping effect, they are also forced to use dampers at the same time, for example, liquid (hydraulic), friction, etc. However, existing designs require further improvements to simplify them, reduce costs, reduce overall dimensions, increase efficiency, reliability, etc.

 The proposed technical solution is somewhat close to the specified requirements.

 AKPO vibration isolators [1] are also widely used to protect instruments, equipment, and other objects, especially in astronautics, aviation, shipbuilding, and other fields.

 The use of the proposed device in vibration isolators of the AKPO type (Figs. 2, 3, 28, 29) will allow not only to expand the scope, but also significantly increase the effectiveness of vibration isolation of the vibration-insulated object 4, service life and reliability.

 An important feature of the vibration isolator is the ability to adjust damping characteristics, moreover, in the conditions of installation and operation.

 In addition, a set of vibration isolators can provide several sizes of a damping element, differing in diameter and length of the cable, which will further expand the range of applications of the vibration isolator.

 Prototypes of vibration isolators will be ready for testing in December 2001.

 Thus, the invention meets the criterion of "novelty."

 Any other vibration isolators with the above advantages are unknown.

Claims (1)

 A spring vibration damper with a damping element, comprising a coil spring, a damping element spirally wound on the wire of this spring, and means for terminating the ends of the damping element, characterized in that the damping element is made of steel wire, and said termination means is a means for attaching the ends of the damping element directly in the places where the spring is attached to the foundation and to the supporting structures of the object or other points of this object.

Images