CN201306407Y - Dynamic vibration absorber - Google Patents

Abstract

The utility model provides a dynamic vibration absorber which is characterized in that the absorber consisting of a mass block, vulcanized rubber and a connecting supporting seat, wherein, the mass block is connected with the connecting supporting seat through the vulcanized rubber. The utility model has the advantages that the binding strength between the mass block and the connecting supporting seat is high; the highly damped wide frequency can be produced; the vibration of the power assembly and the noise in the machine can be reduced; the vibration damping for different vibration sources can be realized by changing the natural frequency of the vibration absorber; the structure is simple; and the process flow is easy to control; and the cost is low.

Description

Dynamic vibration absorber

Technical field

The utility model relates to a kind of dynamic vibration absorber, is used for motor car engine and other vibration source, belongs to the damper technique field.

Background technique

Existing vehicle, as motor corporation of Cherry Tiggo vehicle, because car load assembling and making error, vibration clearly in the car just appears, changing this present situation needs process modification is in all directions just made and assemble to each parts, design and processes is all proposed requirements at the higher level, increased design and cost of production greatly.Therefore need the design bump leveller to eliminate because the very wide (noise of 380Hz～420Hz) of the frequency range that vibration produces, and general dynamic vibration absorber is mostly formed with mass block and a spring, because the damping of spring is very low, so the frequency bandwidth that it covers is very narrow.

Summary of the invention

The purpose of this utility model provides a kind of dynamic vibration absorber, and it can eliminate high frequency and the very wide noise of frequency that vibration produces.

In order to achieve the above object, the technical solution of the utility model provides a kind of dynamic vibration absorber, it is characterized in that, by mass block, vulcanized rubber be connected bearing and form, wherein mass block be connected bearing and connect by vulcanized rubber.

During work, dynamic vibration absorber of the present utility model is done free state work under mass block gravity, produces different natural frequencys by the high damping coefficient that changes mass block sole mass and rubber, and bearing is fixed, and bump leveller is done simple harmonic motion under the effect of resonance.

The principle of dynamic vibration absorber of the present utility model is as follows:

Under the single-degree of freedom vibration system perfect condition during undamped frequency be $\mathrm{fn}=\frac{1}{2\mathrm{\π}}\sqrt{\frac{K}{M}},$

Frequency was when damping was arranged $\mathrm{fs}=\sqrt{1-{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="Y200820153430E00061.png"\; state="\{\{state\}\}">C</figure-callout>}}^2}\mathrm{fn}=\sqrt{1-{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="Y200820153430E00061.png"\; state="\{\{state\}\}">C</figure-callout>}}^2}\frac{1}{2\mathrm{\&pi;}}\sqrt{\frac{K}{M}}(C<1),$

Wherein, C is a damping constant, and K is a static stiffness, and M is a mass block, and △ X is an elastic module.

Different vibration sources be can satisfy by the natural frequency that changes himself from above-mentioned formula dynamic vibration absorber of the present utility model as can be seen and frequency and frequency range (damping constant C and static stiffness K change can be by changing rubber compounding and hardness, and mass block M comes weighing according to demand) thereof produced.

The utility model has the advantages that:

1. mass block and the bond strength height that is connected bearing;

2. can produce the high damping broadband;

3. can reduce the vibration and the internal car noise of power assembly;

4. can realize different vibration source vibration dampings by changing the bump leveller natural frequency;

5. simple in structure, technological process is controlled easily, and cost is low.

Description of drawings

Fig. 1 is dynamic vibration absorber structure and Z direction experiment schematic representation;

Fig. 2 is dynamic vibration absorber X, Y direction experiment schematic representation;

Fig. 3 is dynamic vibration absorber assembling schematic representation;

Fig. 4 is the spectrogram of dynamic vibration absorber directions X;

Fig. 5 is the spectrogram of dynamic vibration absorber Y direction;

Fig. 6 is the spectrogram of dynamic vibration absorber Z direction;

Embodiment

Specify the utility model below in conjunction with embodiment.

Embodiment

As shown in Figure 1, be a kind of dynamic vibration absorber, by mass block 1, vulcanized rubber 2 be connected bearing 3 and form, wherein mass block 1 be connected bearing 3 and connect by vulcanized rubber 2.

We are example with Cherry's Tiggo vehicle just, we had done a large amount of experiments together with research institute of Cherry before design motivation bump leveller 4, mainly concentrate on the Vertical direction (be that the Z direction needed the contribution amount maximum after dynamic vibration absorber 4 was installed, and other both directions X, Y needing too big contribution amount hardly) of motor 6 by the preceding storehouse of NVH testing automobile operator cabin abnormal sound; And Tiggo vehicle engine mounting is by 4 layouts, and the vibration of dynamic vibration absorber Z direction is on the motor right side suspends 5 principal directions; Therefore dynamic vibration absorber is installed in the motor right side and suspends on 5 trailing arms, 6 in dynamic vibration absorber 4 and motor are across suspend 5 trailing arm of the motor right side, as shown in Figure 3, be dynamic vibration absorber assembling schematic representation, dynamic vibration absorber 4Z direction is identical with the principal direction that suspends as can be seen from figure; Absorbed the vibration that vibration damper suspends and fails to absorb; And X, Y both direction are rigid bodies, and the natural frequency of generation is almost absorbed by rigid body entirely; Therefore the natural frequency contribution amount of Z direction is most important to us.Fig. 1 is a dynamic vibration absorber Z direction experiment schematic representation, and Fig. 2 is dynamic vibration absorber X, Y direction experiment schematic representation.

The testing property of above-mentioned dynamic vibration absorber is as follows:

The hammering advocate approach is adopted in test.Dynamic vibration absorber is placed on 1.2 tons of rigid platfors, and acceleration transducer is placed on dynamic test and adopts the hammering advocate approach.Dynamic vibration absorber is placed on 1.2 tons of rigid platfors, acceleration transducer is placed on dynamic vibration absorber 4 upper surfaces, when knocking the point of excitation position of dynamic vibration absorber 4 upper surfaces centre with the power hammer that has force transducer, dynamic vibration absorber 4 is subjected to pulsed excitation and produces vibration.This oscillating signal is picked up by the acceleration transducer on the response measuring point.Send charge amplifier separately to amplify respectively exciting force signal and acceleration responsive signal then, the signal after then will amplifying send ANALYZER analysis (RT rael time).After the instrument analysing and processing, promptly obtain the amplitude frequency curve of dynamic vibration absorber 4X, Y, three directions of Z, by analysis so that obtain the natural frequency of dynamic vibration absorber, as Fig. 4, Fig. 5, shown in Figure 6, being the spectrogram of dynamic vibration absorber X, Y, Z direction, vertically is gravity accleration, laterally is natural frequency; This plotted curve is that frequency changes along with the gravity accleration response; The amplification point of energy is exactly the value (frequency of gravity accleration peak value correspondence just) of natural frequency; The natural frequency of exemplar Z direction is 412.11Hz after tested, the identical 345.53Hz that is of the natural frequency of X, Y direction.

Dynamic vibration absorber of the present utility model has solved the vibration source owing to the different frequency of car load assembling and the generation of component making error, has reduced main engine factory simultaneously each component is carried out the risk that the design and processes rectification brings delay of automobile Time To Market and cost to improve.Bump leveller not only meets the NVH requirement, and with cheap and self good absorbing performance, brings into play more and more important function in automobile industry from now on.

Claims (1)

1. a dynamic vibration absorber is characterized in that, by mass block (1), vulcanized rubber (2) be connected bearing (3) and form, wherein mass block (1) be connected bearing (3) and connect by vulcanized rubber (2).

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