Bushing vibration isolator and method of its manufacturing

FIELD: machine building.

SUBSTANCE: vibration isolator comprises a circular mounting flange (1), a pair of cone-shaped resilient damping elements (2), bushes with dish flanges (3, 4), a stud (5) with threaded ends. The resilient damping elements are made from a coil (6) wound from springy metal wire with turn pitch being equal to the coil diameter, and pressed into a cone shape. The coil is made from a pair of interconnected links with different diameters of springy wire which are wound in coils of different diameter, and is laid with tension crosswise. The link with greater coil diameter is laid over the link with smaller diameter. The method to produce such a vibration isolator includes the following operations. Both coils are stretched up to the turn pitch equal to the diameter of the respective coil. The coil of smaller diameter is wound onto a mandrel, then the coil of greater diameter is wound over it crosswise to form a resilient barrel-like element with further moulding into a cone-shaped resilient damping element. The bigger and the smaller bases of the resilient damping elements are fixed to respectively the mounting circular flange and the inner surfaces of dish flanges which have been treated by sand, with the help of sound glue joint with pressing by the stud. The cone-shaped resilient damping elements are impregnated by lubricating mixture.

EFFECT: higher reliability, longer life of a vibration isolator, protection against vibration in cross directions.

2 cl, 6 dwg

 

The invention relates to transport machinery, primarily to the aerospace industry, and can be used for vibration control panels display information and control systems of the transport vehicle, which requires a lower level of vibration and shock loading.

Known damping element wound of interconnected metal coils of different diameter, and initially wound spiral of smaller diameter turn to turn in several layers, and then, on top of it, is wound a coil of larger diameter at an angle to the spiral of smaller diameter, thus presents a method of winding. The disadvantage of the damping element is insufficient bundle of spiral turns of smaller diameter, which leads to insufficient stiffness of the damping element (U.S. patent No. 5149068, NKI 267/147, IPC F16f 7/00 from 22.09.1992 G.).

Also known vibration absorber bushing comprising two elastic damping element of rectangular cross section material metallorubber placed in seat ring base with two sides with the same effort preload restrictive flanges, tightening the bolt with locking nut, the annular base provided with holes for fastening to protect the product from exposure to vibration loads, � restrictive flanges threaded holes for mounting to the external armature of the object (FRG patent No. DE4408139, IPC F16f 1/38 from 21.09.1995. A disadvantage of the isolator sleeve is insufficient protection of the product from the loads in the transverse direction, which limits its use.

Known vibration absorber bushing, adopted for the prototype contains two elastic damping element made from a material metallorubber placed on a circular base with two sides with different efforts preload restrictive washers, secured to the hub coaxially with an annular base and elastic-damping elements. In addition, between the annular base and one of the limiting washer coaxial with two pre-loaded discharge of springs, one of which is cylindrical covering contact with the majority of its turns of the outer surface of the elastic damping element, and the other conical coil spring mounted in the inner Central conical hole of the elastic damping element, coil smaller base tightly covers the outer surface of the cap restrictive washer, and a large conical portion of the turns of the spring rests on the inner conical surface of the Central hole elastic damping element, and the Central bushing made in the form of a mounting stud at the same time to washer on one end and a threaded part on the opposite to�nce, and the other restrictive washer through the center hole pressed his inner collar on the fixing rod and secured by a nut with longitudinal grooves turnkey (patent for useful model №95048, IPC F16f 3/08 "vibration absorber stub", published. 10.06.2010)

A disadvantage of the isolator bushing wear is the damping element-metal design caused by dry friction on the discharge of the spring, thereby reducing the resource.

The purpose of the present invention is to enhance reliability and improve its damping properties by increasing the stiffness of the elastic damping elements in the longitudinal and transverse directions.

This object is achieved in that the vibration absorber bushing containing the mounting ring flange, a pair of cone-shaped elastic damping elements with the same degree of rigidity, rigidly secured to the mounting ring flange on two sides by large grounds with the same effort preload, sleeve with disc flanges embracing and rigidly secured to the inner surface of the lower bases of the cone-elastic damping elements, a pin with threaded ends made integral with one of the disc flanges with threaded end mounted coaxially with the mounting ring flange and screwed opposite threaded contamw another disc flange.

Distinctive features of the proposed isolator bushing are that cone-shaped elastic damping elements made of spiral wound metal wire from springing, with a step between the spiral turns equal to its diameter, in the form of barrel-shaped elastic element with subsequent pressure tests in the elastic damping element is of a conical shape, and the spiral is made of a pair of interconnected links of different diameters springy wire and stacked with cross-interference, and the link with large diameter spiral stacked on top of its smaller diameter.

A method of manufacturing isolator bushing, consisting in the fact that the elastic damping element is wound of interconnected metal coils of different diameter, and initially wound spiral of smaller diameter mandrel, and then, on top of it, is wound a coil of larger diameter.

Differences of this method are that first, before winding both links of the helix is stretched to step between turns equal to the diameter of the corresponding branch of the spiral, then stretched the links of the spiral wound cross in barrel-shaped elastic element, followed by crimping in a cone-shaped elastic damping element, the length of barrel-shaped elastic element 2.7÷2.9 times greater than the length of the con�conformable elastic damping element, and the diameter, respectively, more than 1.2÷1.4 times. In addition, a robust adhesive rigid connection surfaces of the larger and smaller bases of the cone-elastic damping elements, respectively, with the mounting surfaces of the annular flange and the inner surfaces of the Poppet flange with preload them with a hairpin provides protection of the product from the axial and transverse loads.

Reliable adhesive bond helps sandblasting mounting of the annular flange and the inner surfaces of plate flanges.

The implementation differences of the present invention in combination with the features stated in the characterizing part of the formula ensures the achievement of a new technical effect of the isolator sleeve:

- increased reliability of the isolator bushing by increasing the stiffness of the cone-shaped elastic damping elements,

- increase resource isolator bushing due to the impregnation of a conical elastic damping elements lubricating mixture, thereby eliminating the gap spiral of friction

- ensuring the effective vibration protection of the protected products are not only loads in prodolnaia, but also in the lateral directions.

The invention is illustrated by drawings.

Fig.1 shows the proposed anti-vibration sleeve.

In Fig.2 shows a method of manufacturing a barrel-shaped elastic element and a driving device for its winding.

Fig.3 shows the crimping barrel-shaped elastic element in a cone-shaped elastic damping element and the design of the device for its implementation.

Fig.4, Fig.5, Fig.6 presents the stepwise Assembly of the isolator sleeve.

Vibration absorber includes a mounting ring flange 1, Fig.1, a pair of cone-shaped elastic damping elements 2, is rigidly secured with adhesive to the mounting ring flange 1 on two sides by large grounds with the same effort preloaded sleeves with disc flanges 3, 4 embracing and rigidly secured to the inner surface of the adhesive connection is less reason conical elastic damping elements 2, pin 5 with threaded ends made integral with one of the disc flanges 3 at the threaded end of the stud 5 is mounted coaxially with the mounting ring flange 1 and screwed opposite threaded end to the other Poppet flange 4 with the preload elastic damping elements 2.

Fig.2 and Fig.3 shows a method of manufacturing a conical elastic damping element 2. It is made of 6 spiral wound from springy metal wire with a pitch between the turns of the helix 6, equal to its diameter, barrel-shaped elastic element 7 (Fig.2), followed by crimping (Fig.3) in a cone-provedeni�the following item 2, moreover, the coil 6 is made of a pair of interconnected links with different diameters (d1and d2springy wire and diameters of D1and D2spirals 61and 62and stacked with cross-interference (Fig.2).

For optimum stiffness isolator bushing dimensions barrel-shaped elastic element 7 and a conical elastic damping element 2 are connected by the relations:

Lenjoy!=(2,7÷2,9)·Lcode,

where Lenjoy!- the length of the barrel-shaped elastic element,

Lcode- length cone-shaped elastic damping element.

and Denjoy!=(1,2÷1,4)·dcode,

where Denjoy!- the biggest diameter of the barrel-shaped elastic element.

dcode- the diameter of the larger base of the cone-shaped elastic damping element.

The ratio reached settlement and experimentally.

Fig.2 shows the barrel-shaped elastic element 7 and diagram of the device for its manufacture.

Pre-wound coil to a coil spiral with a smaller wire diameter d1and diameter of the helix D1served in a knot stretching of the helix 6, containing two pairs of rotating rollers 8182and 9192installed at a distance from each other is made with grooves in them, and the speed of rotation of the rollers 9192 above the speed of rotation of the rollers 8182. This allows stretching of the helix 61before step h1between the turns of the helix 61small diameter D1and before step (h2helix 62larger diameter D2. Then the spiral 6 is fed onto the rotating roller 10 mounted on the bar 11, adapted to be vertically reciprocating movement regulating the tension of the spiral 6. Then the spiral is held in the hole of the lever 12, which is made on its end, and the opposite end of the lever 12 is mounted on the platen 13. The end of the lever 12 with the hole carries a horizontal reciprocating motion with adjustable amplitude of the displacement, and the spiral 6 is tightly placed on the rotating shaft 14 a cross-coil on coil, thereby forming a barrel-shaped elastic element 7. Moreover, the spiral link 62larger diameter D2placed on the spiral link 61smaller diameter D1.

Shot barrel-shaped elastic element 7 is set to the crimping device 15 (Fig 3) containing a matrix of 16 that includes a base 17 and a Central pin 18 made integral, and the Cup 19 is mounted on the base 17, and the plug 20, the clamping surface 21 of which is made conical, and the smaller diameters (Dmand more Db/sub> bases are respectively equal to the diameters of the smaller and larger bases of the conical elastic damping elements 2, and the same length, barrel-shaped elastic element 7 is mounted on the pin 18 against the surface of the base 17 and the punch 20 string is pressure tested with endurance in a conical elastic damping element 2 necessary rigidity, the punch 20 is adjacent the surface 22 to the Cup 19 of the matrix 16.

Assembly isolator bushing is carried out in the device shown in Fig.4, Fig.5, Fig.6.

The device includes solereality bracket 23 formed at its side wall coaxially to each other holes 24, 25 one of which 25 are threaded, the screw 26 with the thrust bearing 27, cups 28 (Fig.4, Fig.5) and a glass of 29 (Fig.6).

Pre-made sandblasting adhesive mounting surfaces of the annular flange and the inner surfaces of plate flanges and their subsequent degreasing.

Initially (Fig.4) one of the cone-shaped elastic damping elements 2 a large base is rigidly connected with glue on one side of the mounting ring flange 1 so that the inner surface of the annular flange of the flange covers the larger base element 2, and the other conical elastic damping element 2 less based�eat glue is rigidly connected with the inner surface of the Poppet flange 4 and installed a large base to the opposite side of the mounting ring flange 1. To the assembled structure from opposite sides installed cups 28, wherein one of the cups is installed in the hole 24 of the bracket 23, and the other Cup 28 is pressed against the screw 26 through the thrust bearing 27 to the cone-shaped elastic damping element 2.

Then, after solidification of the adhesive and to dismantle the structure, the larger base of the second cone-shaped elastic damping element 2 is rigidly connected with glue on the opposite side of the mounting ring flange 1 (Fig.5) so that the inner surface of the annular flange of the flange 1 covers a larger surface of the base element 2, to a smaller base element 2 is mounted Cup 28, which fits into the hole 24 of the bracket 23, while the opposite side of the Assembly is pressed against the screw 26 through the thrust bearing 27 and is maintained until solidification of the adhesive.

After disassembly (Fig.5) is the final stage of Assembly of the isolator bushing (Fig.6).

To the inner surface of the Poppet flange 3 is made integral with the pin 5 is rigidly attached by glue smaller base of the second cone-shaped elastic damping element 2, with the threaded end of the pin 5 is screwed into the cupped flange 4, and the opposite threaded end of the pin 5 is mounted in the hole 24 of the bracket 23. The assembled structure is pressed against the screw 26 with under�atikom 27 mounted through the glass 29, adjacent to the mounting ring flange 1 with preload.

After solidification of the adhesive vibration absorber bushing is removed from the device and impregnated with a lubricating mixture to exclude friction against each other spirals when loading and thereby eliminating the gap of the spiral.

Vibration absorber bushing operates as follows.

Mounting an annular flange 1 through the holes 301, 302vibration absorber bushing is fastened by the fastening elements on the product protected from the effects of vibration and shock loads, and the threaded end of the stud 5 vibration absorber bushing is fixed to the valve of the object that is the source of vibration and shock loads, and lock nut 31.

When exposed to vibration absorber bushing vibration and shock loads from the top down in prodolnaia towards the top (Fig.1) cone-shaped elastic damping element CUE 2 is compressed, and the lower CUE 2 is stretched to the same amplitude. During the reverse effect of loads from the bottom up top CUE 2 is stretched, and the lower CUE 2 is compressed. A substantial portion of the vibration energy is dissipated due to the elastic properties of the spirals. Similarly when exposed to vibration absorber transverse loads.

Due to the increased stiffness CUE 2 decreases the resonant frequency in�of bioisostere 1.5÷2 times, one of the main quality characteristics of the vibration control.

Industrial application.

With the use of the application materials the authors have developed documentation for the absorber bushing WUA-15 manufactured batch shock, tested to axial (tensile and compression cone-shaped elastic damping elements), the console loads, and removed the amplitude - frequency characteristics.

At rated load 15 kg resonant frequency when the axial load (16÷20) Hz, the dynamic factor when axial load is 3.5-4.0 static deflection at nominal load:

- axial load 1,6÷2.0 mm;

- command load - 1,5÷2,0 mm.

Static deflection at a load of 90 kg:

- axial load 6÷7 mm

- the console load of no more than 7 mm.

Besides, the obtained minimum dimensions and mass properties.

Thus, the proposed design of the isolator bushing and method of its manufacture, as well as the technical characteristics can be used for vibration isolation, vibration panels display information and control systems of the transport ship.

In the use of the proposed isolator bushing (developed documentation WUA-15) is interested parent company aviation and Kosmicheskaya remotes for displaying information of the transport ship.

Moreover, given the demand isolator bushing on the domestic and foreign markets, such as China, Korea, and taking into account production equipment for its production, there is a possibility of its delivery to the required extent.

Sources of information

1. U.S. patent No. 5149068, "Resilient anti-vibration sleeve, in particular for an exhaust couplings, NKI 267/147, IPC F16f 7/00 from 22.09.1992.

2. FRG patent No. DE4408139, "Compact vibration=damping engine mounting)), MPK F16f 1/38 from 21.09.1995.

3. RF patent for useful model №95048, "vibration absorber stub", IPC F16f 3/08 dated 10.06.2010

1. Vibration absorber bushing containing the mounting ring flange, a pair of cone-shaped elastic damping elements with the same degree of rigidity, rigidly secured to the mounting ring flange on two sides by large grounds with the same effort preload, sleeve with disc flanges embracing and rigidly secured to the lower grounds conical elastic damping elements, a pin with threaded ends made integral with one of the disc flanges with threaded end mounted coaxially with the mounting ring flange and screwed opposite threaded end to the other plate flange, characterized in that the conical elastic damping elements are made of a spiral, wound from springy metal Provolone step between turns of the spiral, equal to its diameter, in the form of barrel-shaped elastic element, followed by crimping in a cone-shaped elastic damping element, wherein the helix is made from a pair of interconnected links with different diameter spring wire wound in a spiral of different diameter, and Packed with tension cross, and the link with large diameter spiral stacked on top of its smaller diameter.

2. A method of manufacturing isolator bushing according to claim 1, consisting in the fact that the elastic damping element is wound of interconnected metal coils of different diameter, and is wound spiral of smaller diameter mandrel, and then on top of it is wound spiral of larger diameter, characterized in that in the beginning both spirals are stretched to the step between turns equal to the diameter of the corresponding spiral, then stretched spiral wound cross in barrel-shaped elastic element, followed by crimping in a cone-shaped elastic damping element, the length of barrel-shaped elastic element 2.7-2.9 times more cone-shaped elastic damping element, and the diameter, respectively, more than 1.2-1.4 times, in addition, more or less the base of the cone-shaped elastic damping element is fixed to sandblasted respectively mounting ring�WMD flange and the inner surfaces of the Poppet flange reliable adhesive connection with the preload stud, a cone-shaped elastic damping elements impregnated with a lubricant mixture.



 

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5 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: group of inventions relates to machine building. A vibration absorber comprises a hollow elastic hysteretic element from metal rubber wire material and fastening parts fixed in its central holes by shaped restriction washers and nuts. According to first version the fastening parts are made as two bolts with one of the bolts being fitted by a through central hole. According to the second version - as a bolt and a bush with a through threaded hole and a flange. A stud is screwed into the threaded hole of the bush. According to the third version - as two such bushes with studs screwed into them. The vibration absorber as per the second version is additionally reinforced by a harness of straight wire bundle braided with a wire spiral stretched with constant interval. The vibration absorber production method consists in the following. The fastening parts are installed on a closed and sealed cloth bag closely filled by sand. A globe-shaped workpiece is formed by winding of the stretched wire spiral. An elastic hysteretic element is produced by pressing in radial directions first and then in the axial direction. The bolts are fastened. A hole is made in the cloth bag and the sand is removed. The cloth is removed, or burnt, or left in the vibration absorber. The studs are screwed into the bushes and fixed.

EFFECT: improved elastic hysteretic properties at cyclic compression and simplified assembly process.

17 cl, 18 dwg

FIELD: machine building.

SUBSTANCE: vibration isolator includes a base and elastic elements. The base is made in the form of vertical cylinder with fasteners located perpendicularly to the cylinder axis in its middle part. One of the fasteners is the bolt with washer, and another one, opposite located and connected with the bolt - thread sleeve with washer, which is a bearing element at a slant location of vibration isolated unit. In the cylinder top the elastic element from elastomer, for example rubber or polyurethane, and in the cylinder bottom - mesh elastic element is located.

EFFECT: efficient damping in resonance mode, simplified design and assembly.

4 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: group of inventions relates to machine building. Bumper comprises fasteners and cylindrical or conical three-strand compression spring. Compression spring with pull over its coils is rigidly secured in wire shell of rubber-metal. Spring thrust coils are free. Shell cross-section can be round, oval, rectangular with rounded or non-rounded angles. Sizes of spring coil cross-section in said shell and spring lead are set to allow a required clearance between adjacent coils. Proposed method comprises the steps that follow. Workpiece is formed by winding the lengths of expanded spiral on central core and pre-compressed thereat in radial directions. Formed workpiece is withdrawn from central core, fitted on spring spiral and finally compressed in special mould to required shell parameters.

EFFECT: simplified design and process, higher load-bearing capacity and strength.

11 cl, 12 dwg

FIELD: machine building.

SUBSTANCE: vibration absorber comprises two tapered resilient bushes from wire non-woven web of rubber-metal material. Small concentric collars are made on the casing, cap and flange of a central bush and are used to align the tapered bushes and provide for radial preloading. Axial preloading in the tapered bushes is created by tightening the lower slotted nut up to the stop of the cap against the coupler screw collar and of the face of the central bush against the cap. The vibration absorber casing is fitted by a flange by which the vibration absorber is connected to a base plate. A unit with its vibration to be absorbed is mounted on the cap and fixed by a washer, the second slotted nut and a split pin. When free, the outer diameter of the tapered bushes is equal to the inner diameter of pilot collars of the casing, cap and flange of the central bush. Diameter of the centre opening of the tapered bushes is equal to the outer diameter of the inner pilot collars of the cap and flange of the central bush. When free, the cone angle of the tapered bushes is determined according to the formula. The height of pilot collars is chosen so that alignment of bushes as per the collars is provided immediately before the creation of preloads on contact surfaces of tapered bushes when they are free.

EFFECT: simplification of assembly procedure for a vibration absorber without its performance characteristics being deteriorated.

3 dwg

FIELD: machine building.

SUBSTANCE: invention relates to machine building. Proposed bumper comprises gauze resilient element locked by top and bottom plates to rest on the base. The latter is composed of a plate with mounting holes. Bottom plate is secured to the base. Top pressure plate is connected with central ring covered by aligned ring jointed to the base.

EFFECT: higher efficiency in resonance mode, simplified design and assembly.

4 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: disk flexible element is made as two flat flexible internal and external rings coaxially arranged. The rings are positioned in parallel horizontal planes and are rigidly interconnected by means of two flexible elements. The flexible elements are radially arranged in horizontal plane at angle within ranges of 10°÷80° in vertical plane. Cavities formed with the flexible rings and flexible radially arranged elements are filled with an elastic damping net element.

EFFECT: raised efficiency of vibration isolation in resonance mode and simplification of design and assembly.

4 cl, 2 dwg

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