CN101408237A - Hollow shafting core rod type damping vibration absorber - Google Patents

Abstract

The invention relates to a hollow shafting mandril type damping shock absorber which belongs to the damping vibration reduction field. The absorber comprises a binder course (2), a viscoelasticity damping layer (3) and a damping mandril (4). The viscoelasticity damping layer is used for simultaneously controlling the torsional vibration and the longitudinal vibration of the hollow shafting. The damping mandril has the restriction function. The viscoelasticity damping layer can be expanded into multi-layer structure and is replaced by the composite structure consisting of a viscoelasticiy layer and an elastic restraint layer. The absorber integrates torsional vibration and longitudinal control devices, meanwhile, the absorber is arranged in the internal cavity of the shafting, which does not occupy outer space, and saves cost and space.

Description

Hollow Shaft Mandrel Type Damping Shock Absorber

technical field

The invention relates to a hollow shaft mandrel type damping shock absorber, which belongs to the technical field of damping and vibration reduction, in particular to a hollow shafting torsional vibration and longitudinal vibration damping shock absorber.

Background technique

The shafting of the transmission system of ships and other large-scale institutions is prone to vibration due to the excitation of power equipment and propellers, and its vibration form is multi-directional, that is, torsional vibration, longitudinal vibration and lateral vibration exist at the same time. Since the accidents caused by torsional vibration account for a relatively large proportion, people often pay more attention to torsional vibration in research, and have studied a variety of torsional vibration dampers, including various pendulum torsional vibration dampers, viscous liquid type Dampers and magnetorheological fluid dampers also have damping devices to control their lateral vibrations, such as the shaft dampers described in patent CN 1620563A, but due to the complexity of the damping devices for longitudinal vibrations, they are generally rarely involved, and At present, various vibration control devices of the shafting system are placed outside the shafting system, which requires additional space. At the same time, since the devices for controlling vibration in different directions are studied separately, the cost of research and manufacturing is increased.

Contents of the invention

The purpose of the present invention is to make up for the deficiencies of existing shafting vibration dampers, and provides a new type of shafting vibration comprehensive control damper, which can simultaneously reduce the two-way vibration of the shafting, that is, the shock absorber It can reduce its torsional vibration and reduce its longitudinal vibration. At the same time, according to the characteristics of the hollow structure of the transmission shaft system of large-scale institutions such as ships, the shock absorber is arranged in the cavity of the shaft without occupying additional space.

A hollow shaft mandrel type damping shock absorber, which is used to simultaneously control the torsional vibration and longitudinal vibration of the shaft, is characterized in that it includes a connecting layer installed in the inner cavity of the hollow shaft, and an adhesive An elastic damping layer, and a constrained mandrel placed at the center of the hollow shaft.

The viscoelastic damping layer can be considered to be extended to a multi-layer structure, which is replaced by a composite structure composed of a viscoelastic layer and an elastic constrained layer.

The viscoelastic damping layer between the connecting layer and the constraining mandrel is in an effective shear state during torsional vibration and longitudinal vibration of the shaft system, which can dissipate the energy of the system. The damping mandrel type shock absorber of the present invention combines the torsional vibration control device and the longitudinal vibration control device into one, which can control both the torsional vibration of the shaft system and its longitudinal vibration, and at the same time place the shock absorber in the hollow shaft system In the cavity, it saves cost and saves space.

Description of drawings

Fig. 1 is an axial view of a hollow shafting mandrel type damping shock absorber.

Fig. 2 is an axial sectional view of the hollow shaft mandrel type damping shock absorber.

The names of the components in the figure are: 1. Hollow shaft 2. Coupling layer 3. Viscoelastic damping layer 4. Constraint mandrel.

Detailed ways

As shown in Figures 1 and 2, the hollow shafting mandrel type damping shock absorber of the present invention includes a cylindrical coupling layer 2 installed in the inner cavity of the shaft, and also includes a cylindrical restraining mandrel 4, round A cylindrical viscoelastic damping layer 3 is adhered between the connecting layer and the mandrel, wherein according to the figure, the length of the connecting layer is slightly longer than that of the viscoelastic layer and the mandrel, in order to process the connection on the protruding part Parts, so that the shock absorber is more conveniently fixed inside the shaft.

When the torsional vibration of the shaft system occurs, the viscoelastic damping layer undergoes circumferential shear deformation under the constraints of the coupling layer and the restraint mandrel, dissipates energy, and plays a role in reducing torsional vibration; when the shaft system undergoes longitudinal vibration, the viscoelastic damping layer The elastic damping layer undergoes axial shear deformation under the constraint of the connecting layer and the constraining mandrel, dissipates energy, and plays a role in reducing longitudinal vibration.

The viscoelastic damping layer 3 can be expanded to a multi-layer structure, replaced by a composite structure composed of a viscoelastic layer and an elastic constrained layer; the number of layers can be changed according to needs, and a multi-layer structure can be designed.

Claims (3)

1. A hollow shaft mandrel type damping shock absorber, which is used to simultaneously control the torsional vibration and longitudinal vibration of the hollow shaft, is characterized in that: it includes a cylindrical coupling layer (2 ), a cylindrical constraining mandrel (4), and a viscoelastic damping layer (3) adhered between the tie layer and the constraining mandrel. 2. A hollow shaft mandrel type damping shock absorber, which is used to simultaneously control the torsional vibration and longitudinal vibration of the hollow shaft. It is characterized in that it includes a cylindrical coupling layer (2) installed in the inner cavity of the hollow shaft, a cylindrical constraining mandrel (4), and an elastic-viscosity bonded between the coupling layer and the constraining mandrel. An elastic composite structure, the composite structure is composed of a viscoelastic layer (5) and an elastic constrained layer (6). 3. The hollow shaft mandrel type damping shock absorber according to claim 2, characterized in that: the number of viscoelastic layers and elastic constrained layers of the elastic-viscoelastic composite structure can be arbitrarily designed according to needs .

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