CN204253727U - The torsional vibration damper that a kind of damping is adjustable - Google Patents

Abstract

The utility model discloses a torsional shock absorber with adjustable damping, which comprises a sealed casing, in which a support cylinder is arranged coaxially, and four protruding casing ribs are arranged at equal intervals around the inner wall of the sealing casing, and the casing ribs The length direction of the sealed shell is consistent with the axial direction of the sealed shell; there are several diversion holes on the ribs of each shell; the cavity between the sealed shell and the support cylinder is filled with magnetorheological fluid; the outer wall of the sealed shell is installed with Two radially symmetrically distributed magnetic guides; coils are wound outside the two magnetic guides; two ring-shaped conductive supports are installed on both sides of the axial direction of the sealed shell; At least one brush connected to the coil is connected between them. The utility model changes the damping of the magneto-rheological fluid between the support cylinder and the sealing shell by adjusting the magnitude of the magnetic field generated by the coil, thereby reducing the torsional vibration on the transmission shaft and improving the chattering phenomenon of the transmission shaft.

Description

A torsional shock absorber with adjustable damping

technical field

The utility model belongs to the vibration damping field of mechanical transmission shafts, in particular to a torsional vibration damper with adjustable damping.

Background technique

The rapid development of today's social economy and the great improvement of production efficiency are inseparable from mechanical structures. There are different transmission devices in the mechanical mechanism. The transmission shaft of the mechanical mechanism is a very common way, but when the transmission shaft of the mechanical mechanism is driven at low speed, the transmission shaft will vibrate obviously, which will affect the performance of the entire mechanical mechanism. Since modern mechanical devices usually need to be used under different rotational speed conditions, and the traditional torsional dynamic vibration absorber has a fixed value of damping, which cannot be changed according to the change of rotational speed, and can only be used for vibration reduction at a specific frequency. has limitations. Therefore, it is of great significance to design a torsional shock absorber with adjustable damping that can be used in different working conditions to improve the anti-vibration performance of the mechanical transmission shaft.

Contents of the invention

In view of the defects or deficiencies in the above-mentioned prior art, the purpose of the present utility model is to provide a torsional shock absorber with adjustable damping.

In order to achieve the above tasks, the utility model adopts the following technical solutions to achieve:

A torsional shock absorber with adjustable damping, comprising a sealed shell, in which a support cylinder is arranged coaxially, four protruding shell ribs are arranged at equal intervals around the inner wall of the sealed shell, and the length direction of the shell ribs is It is consistent with the axial direction of the sealed shell; there are several diversion holes on each shell rib; the cavity between the sealed shell and the support cylinder is filled with magnetorheological fluid, and the magnetorheological fluid can flow on the shell ribs The flow in the guide hole on the top; two radially symmetrically distributed magnetic guides are installed on the outer wall of the sealed shell; coils are wound on the outside of the two magnetic guides; correspondingly installed on both sides of the sealed shell in the axial direction Two ring-shaped conductive brackets, the ring-shaped conductive bracket overlaps with the axis line of the sealed casing; at least one brush connected to the coil is connected between the ring-shaped conductive bracket and the sealed casing.

Further, there are four diversion holes on each shell rib.

Further, the support cylinder is a cylinder, the outer wall of which is provided with four protruding support cylinder ribs at equal intervals around the circumference, and the length direction of the support cylinder ribs is the axial direction of the support cylinder; the support cylinder ribs of the support cylinder and the shell ribs are one by one alternately.

Further, the transmission shaft coaxially passes through the sealing housing and the supporting cylinder.

Further, the inner wall of the support cylinder is provided with a keyway, and the support cylinder is connected with the transmission shaft in the support cylinder through the cooperation of the keyway and the key, and the transmission shaft and the sealing housing are fixed by rolling bearings.

Further, a rubber sealing ring is provided between the transmission shaft and the sealing housing.

Further, the shape of the magnetic guide is horseshoe.

Further, four brushes are connected between the annular conductive support and the airtight casing.

The torsional shock absorber with adjustable damping of the utility model is installed on the transmission shaft. When the transmission shaft vibrates at different speeds, the magnetorheological fluid between the support cylinder and the sealing shell can be changed by adjusting the magnitude of the magnetic field generated by the coil. Damping to reduce the torsional vibration on the drive shaft and improve the chattering phenomenon of the drive shaft. The torsional vibration damper enables the mechanical transmission shaft to meet vibration reduction requirements under different frequency operating conditions.

Description of drawings

Fig. 1 is a structural schematic diagram of the torsional shock absorber with adjustable damping of the present invention.

Fig. 2 is a sectional view taken along line A-A of Fig. 1 .

Meanings of marks in the figure: 1. Drive shaft, 2. Rolling bearing, 3. Coil, 4. Support cylinder, 5. Sealed shell, 6. Magneto-rheological fluid, 7. Magnetic guide, 8. Ring-shaped conductive support, 9 , Electric brush.

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Detailed ways

Referring to FIG. 1 , the torsional shock absorber with adjustable damping in this embodiment includes a sealed housing 5 and a support cylinder 4 inside the sealed housing 5 , and the inner cavity of the sealed housing 5 is cylindrical.

The inner wall of the sealed housing 5 is provided with four protruding housing ribs 51 at equal intervals around the circumference, and the length direction of the housing ribs 51 is consistent with the axial direction of the sealed housing 5; each housing rib 51 has four guide holes 52 The outer wall of the sealed shell 5 is equipped with two radially symmetrically distributed magnetic elements 7 , which are horseshoe-shaped; the two magnetic elements 7 are wound with a coil 3 .

In this embodiment, the magnetically conductive part 7 is made of a magnetically conductive cast iron, so as to realize the electromagnetic induction between the coil 3 and the magnetically conductive part 7 .

The support cylinder 4 is a cylinder, and four protruding support cylinder ribs 41 are provided at equal intervals on its outer wall. The length direction of the support cylinder ribs 41 is the axial direction of the support cylinder 4; 51 are alternated one by one, and the cavity between the sealed casing 5 and the support cylinder 4 is filled with magnetorheological fluid 6 , and the magnetorheological fluid 6 can flow in the guide holes 52 on the ribs 51 of the casing.

The transmission shaft 1 coaxially passes through the sealing shell 5 and the support cylinder 4, and the inner wall of the support cylinder 4 is provided with a keyway, and the support cylinder 4 is connected with the transmission shaft 1 in the support cylinder 4 through the cooperation of the keyway and the key. The sealed housings 5 are fixed by rolling bearings and sealed with rubber sealing rings.

Two annular conductive brackets 8 are correspondingly installed on both axial sides of the sealed housing 5, and the annular conductive brackets 8 overlap with the axis line of the sealed housing 5; four brushes9.

The annular conductive bracket 8 is fixed on the vehicle frame, and is used to supply power to the brush 9 installed on the sealed casing 5, and the brush 9 is connected to the coil 3 through a wire.

The working principle of the utility model is as follows:

When the transmission shaft 1 rotates, it drives the support cylinder 4 to rotate in the sealed casing 5 , and since the inside of the sealed casing 5 is filled with magnetorheological fluid 6 , when the support cylinder 4 rotates, it will drive the sealed casing 5 to rotate together. A brush 9 is installed on the sealed casing 5 to supply the current on the annular conductive support 8 to the coil 3 , and the coil 3 is wound on the magnetic conductor 7 on the outer wall of the sealed casing 5 to generate a magnetic field.

The magnetorheological fluid 6 is a controllable fluid, which is a suspension formed by mixing tiny soft magnetic particles with high magnetic permeability and low magnetic hysteresis and non-magnetic conductive liquid. This kind of suspension exhibits low-viscosity Newtonian fluid characteristics under the condition of zero magnetic field; under the action of strong magnetic field, it presents high-viscosity, low-fluidity Bingham fluid characteristics, and as the current increases, the magnetic field increases , the greater the shear yield strength of the fluid, this characteristic is applied to the controllable dynamic shock absorber. The rheology of magnetorheological fluid under the action of a magnetic field is instantaneous and reversible, and its shear yield strength after rheology has a stable corresponding relationship with the strength of the magnetic field.

When the rotational speed of the drive shaft 1 changes, the current of the coil 3 can be changed by changing the current of the annular conductive support 8, and the magnetic field intensity introduced into the airtight casing 5 through the magnetic guide 7 will also change accordingly, thereby changing the airtight The damping of the magnetorheological fluid 6 inside the housing 5 is related to the damping because the ratio of the actual amplitude of the transmission shaft 1 to the static torsional deformation, that is, the amplification factor A, can reduce the vibration of the transmission shaft 1 by changing the damping.

To sum up, when the mechanical device is used under different rotational speed conditions, the device of the present utility model realizes vibration reduction, which can effectively improve the shaking phenomenon of the mechanical mechanism.

Claims (6)

1. the torsional vibration damper that a damping is adjustable, comprise seal casinghousing, in seal casinghousing, coaxially supporting drum is set, it is characterized in that, the inwall of described seal casinghousing is equidistantly provided with four outstanding housing ribs for one week, the length direction of housing ribs and the axial consistent of seal casinghousing; Each housing ribs there are several pod apertures; Be perfused with magnetic flow liquid in cavity between seal casinghousing and supporting drum, magnetic flow liquid can flow in the pod apertures in housing ribs; Seal casinghousing outer wall is provided with two radially symmetrical magnetic conductive parts; Two magnetic conductive part outsides are wound with coil jointly; Be provided with two ring shaped conductive supports in the both sides correspondence of the axis of seal casinghousing, ring shaped conductive support is overlapping with the shaft axis of seal casinghousing; At ring shaped conductive support and the brush being connected with at least one between closed shell and being connected with coil.

2. the torsional vibration damper that damping as claimed in claim 1 is adjustable, is characterized in that described each housing ribs there are four pod apertures.

3. the torsional vibration damper that damping as claimed in claim 1 is adjustable, it is characterized in that, described supporting drum is a cylinder, and its outer wall is equidistantly provided with four outstanding supporting drum ribs for one week, and the length direction of supporting drum rib is the axis of supporting drum; The supporting drum rib of supporting drum and housing ribs replace one by one.

4. the torsional vibration damper that damping as claimed in claim 1 is adjustable, it is characterized in that, described supporting drum inwall is provided with keyway, and supporting drum is connected with the transmission shaft in supporting drum with the cooperation of key by this keyway, is fixed between transmission shaft and seal casinghousing by rolling bearing.

5. the torsional vibration damper that damping as claimed in claim 1 is adjustable, it is characterized in that, the shape of described magnetic conductive part is horse shoe shaped.

6. the torsional vibration damper that damping as claimed in claim 1 is adjustable, is characterized in that, describedly between ring shaped conductive support and closed shell, is connected with four brushes.