Vibration isolator by kochetov with sequentially connected resilient damping elements

FIELD: machine building.

SUBSTANCE: vibration isolator comprises a case, a base, a spring, top and bottom spring stroke limiters made of elastomer, and a threaded bush to couple the said spring with the body whose vibrations are to be damped. The said case is rigidly coupled with the base made as a round centre pad. The bottom spring stroke limiter of cylindrical shape rests upon the centre pad. The spring interacts with the top and bottom stroke limiters via the lower thrust barrel and the top cover enclosing the spring, the cover is rigidly connected with the threaded bush. The cover comprises the top spring stroke limiter made as a cylindrical bush enclosing the cover from above. The threaded bush comprises a screw to couple the spring with the body to be isolated in terms of vibration. The body in its upper part is coupled with the cover, on the end surface of which there is a resilient dynamic limiter of the body movement made from elastomer. The cover is provided with a hole for the injection of a ductile lubricant, e.g. solid oil, into the system. Two additional damping elements are set in the axial hole of the bottom spring stroke limiter, one of the elements is made as a cylinder-conic bush and made from polyurethane and the other one is set inside the first element, is of cylindrical shape and made as resilient gauze. A damper made from elastomer is set inside the spring.

EFFECT: higher vibration isolation efficiency.

1 dwg

 

The invention relates to protection from vibrations.

The closest technical solution to the declared object is the technical solution according to the patent of Russian Federation №2451849, CL F16F 15/02 (prototype), comprising a housing, a base, an elastic element, upper and lower stroke limits of the elastic element made of elastomer.

The disadvantage of the prototype is the relatively low efficiency of isolation due to the lack of viscous damping.

The technical result - improving the efficiency of isolation by increasing damping at low frequencies while maintaining the dimensions of the insulator.

This is achieved in that in the vibration damper connected in series with the elastic-damping elements, comprising a housing, a base, an elastic element, upper and lower stroke limits of the elastic element made of elastomer, and a threaded nut that connects the elastic element with vibroisolating object, the housing is rigidly connected with the base, made in the form of a circular thrust bearing, on which rests the lower cylindrical elastic damping element made of elastomer with an axial cylindrical bore, performing the functions of the lower limit switch spring, the axis of which is perpendicular to the ground, with the spring cooperates with the upper and lower ogran what Cetelem progress through the lower the bearing Cup and the top, cover spring cover, which is rigidly connected with the axisymmetric spring stem nut, and the cap fixed upper limit switch spring, made in the form of a cylindrical sleeve covering the top cover, the upper limiter serves as an upper elastic damping element made of elastomer, and a threaded sleeve fixed screw for connection of the elastic element with vibroisolating object, in this case in the upper part is connected with the cap, on the end surfaces of which facing vibroisolating object attached elastic limiter dynamic travel of the object, made of elastomer, and a cover, perpendicular to its axis made a hole for injection into the lubricating system of viscous material such as grease, and the axial cylindrical hole of the lower cylindrical elastic damping element made from elastomer coaxially between and coaxially with the housing are two additional damping element, one of which is shaped in the form of a cylindrical sleeve made of polyurethane, and the other located inside the first, and having a cylindrical shape, made of elastic mesh element, and inside the spring, coaxial she placed a damper elastomer, while the profile of the lateral surface of the elastomer done the n hyperbolic in the form of beams of equal resistance, with constant stiffness in the axial and transverse directions.

The drawing shows the front was extended offer of insulator.

Vibration absorber connected in series with the elastic-damping elements includes a housing 8, is rigidly associated with the base 1 made in the form of a circular thrust bearing, on which rests the lower cylindrical elastic damping element 4 elastomer with an axial cylindrical bore 2 that performs the functions of the lower limit switch spring 12. Inside the spring, coaxial she placed a damper elastomer, and the profile of the lateral surface of the elastomer is made of a hyperbolic (not shown) in the form of beams of equal resistance with constant stiffness in the axial and transverse directions, which provides ravnochestnosti elastic element of insulator in all directions. The profile of the lateral surface of the elastomer can be also cylindrical or conical (not shown).

Elastic element of insulator is made of spring 12, the axis of which is perpendicular to the base 1. Spring 12 communicates with the upper and lower stroke limits through the lower bearing Cup 13 and the upper cover spring cover 9, which is rigidly connected with axisymmetric spring 12 threaded sleeve 6. On the cover 9 C is established upper limit switch spring 12, made in the form of a cylindrical sleeve 5, covering the top of the cover 9. Upper limiter serves as an upper elastic damping element made of elastomer. In the threaded sleeve 6 fixed screw 7 for connection of the elastic element with vibroisolating object (not shown). Case 8 in the upper part is connected to the cover 10, on the end surfaces of which facing vibroisolating object attached elastic stopper 11 dynamic travel of the object, made of elastomer. In the cover 10, perpendicular to its axis, made a hole 3 for injection into the lubricating system of viscous material such as grease.

In the axial cylindrical hole 2 lower cylindrical elastic damping element 4 elastomer coaxially between and coaxially with the housing are two additional damping element, one of which is shaped in the form of a cylindrical sleeve 14 made of polyurethane, and the other 15 located inside the first and having a cylindrical shape, made of elastic mesh element. The density of the mesh structure elastic mesh element is in an optimal range of values of 1.2 g/cm3...2.0 g/cm3and the material elastic wire mesh elements - steel EI-708, and its diameter is optimum interval were the John 0,09 0,15 mm...mm

Vibration absorber connected in series with the elastic-damping elements is as follows.

Under the application of static loads on the object, it goes down, compressing the spring 12, which takes the vertical load, thus weakening the dynamic impact on the base 1 mounted on the intermediate floor of the building or vehicle chassis (not shown). Nonlinear damping in the system is due to the lower 4 and upper 5 restrictors spring 12, is made of elastomer. Horizontal oscillations are damped due to the unfettered (with a clearance) location lower bearing Cup 13 of the spring 12 and the upper cover spring cover 9.

Two additional damping element 14 and 15, made from polyurethane, and the mesh extend the frequency range of vibration damping and increase the efficiency of vibration protection.

Under the application of dynamic loads from the side of the object, such as operating equipment, vibration is suppressed by the spring 12 and the elastic-damping elements 4 and 5, the rigidity of which is calculated on complex systems "overlap-elastic elements-object" in the above-resonance mode.

Fluctuations vibroisolating object damper elastomer vosprinimatelnoe load, thus weakening dynamic effect. Horizontal oscillations are damped due to unfettered location elastomer, which gives him a certain degree of freedom vibrations in the horizontal plane. The profile of the side surfaces of the elastomer hyperbolic in the form of beams of equal resistance with constant stiffness in the axial and transverse directions, you can ensure ravnopravnosti, ravnochestnosti and efficiency of elastomer, for example, rubber or polyurethane. The proposed solution is effective vibration protection means.

Vibration absorber connected in series with providentiality elements, comprising a housing, a base, a spring, upper and lower stroke limits of the spring, made of elastomer, and a threaded sleeve connecting the spring with vibroisolating object, the housing is rigidly connected with the base, made in the form of a circular thrust bearing, on which rests the lower cylindrical providentiae element of elastomer with an axial cylindrical bore, performing the functions of the lower limit switch spring, the axis of which is perpendicular to the ground, with the spring cooperates with the upper and lower stroke limits through the lower bearing Cup and the top cover spring cover, which is rigidly connected to the on axisymmetric spring threaded bushing, and on the cover fixed upper limit switch spring, made in the form of a cylindrical sleeve covering the top cover, the upper limiter serves as an upper providentialism element made of elastomer, and a threaded sleeve fixed screw for connection of the spring with vibroisolating object, in this case in the upper part is connected with the cap, on the end surfaces of which facing vibroisolating object attached elastic limiter dynamic travel of the object, made of elastomer, and the cover perpendicular to its axis is made the hole injection into the lubricating system of viscous material such as grease and axial cylindrical the opening of the lower cylindrical providentiales element of elastomer coaxially between and coaxially with the housing are two additional damping element, one of which is shaped in the form of a cylindrical sleeve made of polyurethane, and the other located inside the first and having a cylindrical shape, made of elastic mesh element, characterized in that the inside of the spring coaxial she placed a damper elastomer, while the profile of the lateral surface of the elastomer hyperbolic made in the form of beams of equal resistance with constant stiffness in the axial direction is transverse directions.



 

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3 dwg

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4 dwg, 2 tbl

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1 dwg

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9 cl, 5 tbl, 18 ex

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EFFECT: increased efficiency of dimensional vibration isolation and simplified design and assembling.

1 dwg

FIELD: mechanical engineering.

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EFFECT: enhanced reliability.

2 cl, 4 dwg

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