CN201666330U - Mass shock absorbers, vehicle drive shafts and vehicles - Google Patents

Abstract

The utility model discloses a mass vibration absorber, which comprises two vibration-absorbing sub-systems for absorbing vibration energy of different frequencies, each vibrator-absorbing system is composed of a mass body and an elastic body for supporting the mass body, wherein, The two vibrator-absorbing sub-systems are arranged independently of each other, and the mass bodies of the two vibrator-absorbing sub-systems have the same mass and are formed of metal materials with a relatively small mass. The utility model also discloses a vehicle driving shaft and a vehicle equipped with the mass vibration absorber. The mass vibration absorber of the utility model can not only adapt to the space layout restriction of the vehicle, but also meet the frequency and quality requirements required for vibration absorption.

Description

Quality bump leveller, vehicle drive shaft and vehicle

[technical field]

The utility model relates to a kind of vehicular field, relates in particular to a kind of quality bump leveller of vehicle drive shaft, the vehicle drive shaft that this quality bump leveller is installed and vehicle thereof of being used for.

[background technique]

Vehicle different and motor institute mounting point according to wheel that motor connected different can arrange its transmission system be divided into five classes: engine behind front wheel front-wheel drive (being called for short " preposition forerunner "), engine behind front wheel rear wheel drive (being called for short " preposition rear-guard "), engine in front of rear wheel mid-engine rear wheel drive (being called for short " mid-rear-guard "), engine at extreme rear rear wheel drive (being called for short " rearmounted rear-guard ") and four-wheel drive (abbreviation " 4 wheel driven ") usually.

The advantage of preposition precursor vehicle is: the power system compact structure, and live axle is short, and the power output loss is low; Aspect controlling, precursor vehicle is driven easily; Aspect layout, there is not transmission shaft through the compartment, can reduce the middle protuberance of vehicle body, increase the compartment free space.Therefore, in middle-size and small-size car of modern times, generally adopt.

In preposition precursor vehicle, the vibration that power assembly work produces by suspend, structure such as live axle is delivered to vehicle body, thereby cause car internal vibration and noise problem, the solution that adopts is to add the packing quality bump leveller on live axle usually.

Fig. 1 is a kind of principle schematic of quality bump leveller.This quality bump leveller 3 ' respective frequencies and its quality and the following formula of flexible relation shown in:

$\mathrm{\ω}=\sqrt{\frac{k}{m}}$

Wherein ω is the frequency of quality bump leveller 3 ' correspondence, k be quality bump leveller 3 ' middle elastomer 32 ' elasticity coefficient, m be quality bump leveller 3 ' middle mass 30 ' quality.

From top formula as can be seen, quality bump leveller 3 ' middle mass 30 ' the constant situation of quality m under, quality bump leveller 3 ' middle elastomer 32 ' elasticity k big more, then its corresponding frequencies omega is big more; Quality bump leveller 3 ' middle elastomer 32 ' elasticity k more little, then its corresponding frequencies omega is more little.

When needs on live axle during the installation quality bump leveller, select suitable quality bump leveller according to the eigentone of live axle under the vehicle installment state, so that the frequency of quality bump leveller correspondence is when identical with the eigentone of live axle under the vehicle installment state, the two resonates, thereby the quality bump leveller can effectively suppress or weaken the vibrational energy of this live axle natural frequency under the vehicle installment state.

Can suppress the vibration of jack shaft under natural frequency adding the packing quality bump leveller on the live axle, be delivered to the vibrational energy of vehicle body thereby reduce, and then improve car internal vibration and noise qualities, this has certain application in the industry in Automobile Design.

In some vehicle, for example, its right side jack shaft designs for major semi axis, and the diameter of axle of this jack shaft under the vehicle installment state is about 100Hz to the mode of flexural vibration frequency; Motor is that the vibrational excitation frequency content that produces under 1000-6000 rev/min the situation is very abundant in the working speed scope, cause under specific engine speed 2800-3300 rev/min, the natural frequency of jack shaft is excited and causes in the car and significantly resonates and the boom phenomenon.

The quality bump leveller of conventional jack shaft adopts single-frequency energy absorbing principle, only design an elastic qualities body, solve resonance and reso-nance problems in the single speed range, but if the mass short weight of design will make the speed range of adjacent (being the low and higher both sides of former problem rotating speed) new vibration and noise problem occur.

Therefore, press for a kind of modified model quality bump leveller of proposition to overcome the above problem that exists in the prior art.

[model utility content]

The purpose of this utility model provides a kind of quality bump leveller and the vehicle drive shaft and the vehicle of this quality bump leveller is installed, and this quality bump leveller can either adapt to the space layout restriction of vehicle, can satisfy needed frequency of absorbing and quality requirement again.

For reaching above-mentioned purpose, the utility model adopts following technological scheme:

The utility model provides a kind of quality bump leveller, it comprises having two absorbing subtense angles that absorb the vibrational energy of different frequency, described each absorbing subtense angle by mass and the elastomer that is used to support described mass form, wherein, described two absorbing subtense angles separate setting under installment state.

Between two absorbing subtense angles of the utility model quality bump leveller separate be provided with can avoid two absorbing subtense angles when the vehicle traction shaft vibration with respect to vehicle drive shaft generation axial displacement and the phase mutual interference.By mass, can not occupy too big space, thereby in the limited space of vehicle, the quality bump leveller that satisfies needed respective frequencies of absorbing and quality requirement is installed two absorbing subtense angles.

In a kind of preferred embodiment, the mass of described two absorbing subtense angles all is to be formed and had an essentially identical quality by metallic material, but the elastomeric hardness difference of the mass of described two absorbing subtense angles.By the mass of two absorbing subtense angles is arranged to essentially identical quality, makes the configuration optimization of volume, thereby can effectively satisfy the installation requirement in the confined space of vehicle.

The absorbing subtense angle is the hollow cylindrical with shaft axis, is convenient to be installed on the whirling vibration part as vehicle drive shaft and so on, and the mass of each absorbing subtense angle is fixed in its elastomer.Preferably, the mass of described each absorbing subtense angle is coated in its elastomer fully, thereby effectively prevents the metal erosion of mass.Each elastomer also forms interior thinner wall section in a side of the close described shaft axis of described mass, and outside the side away from described shaft axis of described mass forms thinner wall section, and the internal diameter of interior thinner wall section is greater than elastomeric minimum diameter.Thereby, can be when the absorbing subtense angle be installed on the vehicle drive shaft, the vibration of vehicle drive shaft can be so that the absorbing subtense angle can be with respect to live axle generation radial displacement, and then produces the resonance of absorbing subtense angle.

Each absorbing subtense angle also comprises clamp, and each described elastomeric outer circumferential face is provided with annular groove, and described clamp is used for fixing respectively at described circular groove.Thereby, be convenient to elastomer is installed on the vehicle drive shaft.

The utility model also provides a kind of vehicle drive shaft, it can rotate so that driving force is sent to driving wheel, it comprises and the coaxial mounted aforementioned quality bump leveller of described vehicle drive shaft, can absorb described vehicle drive shaft vibrative vibrational energy under rotation status.

Be used for driving force is sent to respectively the vehicle drive shaft of making a long driver moving semiaxis and short jack shaft of driving wheel for comprising, preferably, with two absorbing subtense angle axially spaced-aparts be installed in and make a long driver on the moving semiaxis, be used to reduce the energy of the vibration major part of live axle.

In a kind of preferred embodiment, one of them absorbing subtense angle of described quality bump leveller absorbs described vibrational energy of making a long driver moving semiaxis natural frequency under the vehicle installment state, and the vibrational energy of the higher frequency of the described natural frequency of another absorbing subtense angle absorptance.

In a kind of preferred embodiment, form annular space between the position of the described mass of elastomeric support of quality bump leveller and the live axle, thereby have elastic space preferably along the live axle extending circumferentially, obtain better shock attenuation result.

The utility model also provides a kind of vehicle, and it comprises above-described vehicle drive shaft.Described vehicle drive shaft has the natural frequency of measuring under the vehicle installment state, the frequency of the vibrational energy of an absorption of one of them absorbing subtense angle of described quality bump leveller equals described natural frequency, and the frequency of the vibrational energy that another absorbing subtense angle absorbs is greater than described natural frequency.Thereby, give the comfortable feel of occupant's maximum of vehicle the most outstanding shock absorption.

The utility model creatively adopts two quality bump leveller designs of two different frequencies, less quality, the frequency of one of them absorbing subtense angle correspondence is 100Hz, the frequency of another absorbing subtense angle correspondence is 130Hz, and it is the quality settings of the mass of two absorbing subtense angles is identical and form by the metallic material of less quality, thereby the effectiveness in vibration suppression of two height absorbing subtense angles is superposeed under 100Hz, solved the very big problem of live axle resonance energy; Utilize the big advantage of absorbing frequency span of high and low frequency absorbing subtense angle simultaneously, guaranteed 1000-6000 rev/min of Nei Chenei favorable damping of engine running velocity range noise reduction.

Quality bump leveller of the present utility model has solved car internal resonance and the resonance noise problem of vehicle in accelerating process well, has improved greatly and has driven noise circumstance in the car, has improved the vehicle drive integrated quality, has good practicability.

Below by describing preferred embodiment with reference to the accompanying drawings in detail, disclose other aspects of the present utility model and feature more significantly.But should be known in this accompanying drawing only for task of explanation designs, not as the qualification of scope of the present utility model, because the qualification of scope should be with reference to additional claim.Should also be appreciated that unless otherwise indicated, accompanying drawing only tries hard to illustrate conceptually structure described herein and flow process, unnecessary drafting to scale.

[description of drawings]

Fig. 1 is a kind of principle schematic of existing quality bump leveller.

Fig. 2 is the stereogram that the vehicle drive shaft of quality bump leveller is installed of the present utility model.

Fig. 3 is the partial sectional view of Fig. 2, and it has clearly revealed the internal structure of the first absorbing subtense angle and the second absorbing subtense angle.

Fig. 4 is the principle schematic of quality bump leveller of the present utility model.

Fig. 5 is that the performance before and after vehicle drive shaft is installed quality bump leveller of the present utility model compares schematic representation.

[embodiment]

With reference now to accompanying drawing, describe the utility model embodiment preferred, wherein identical label is used for guiding identical element all the time.Purpose for explaining provides many details in the following description, understands in depth so that the utility model provided.Yet this may be conspicuous, does not have these details, and this model utility still can be implemented.

In view of vehicle in the car internal resonance and the boom problem of giving it the gun under specified engine speed 2800-3300 rev/min, by carrying out a large amount of Computer Simulation and experimental test analytical work, determined that finally right side jack shaft (promptly make a long driver moving semiaxis) is the basic reason that causes this problem in the coupling of natural frequency 100Hz and motor vibrational excitation under corresponding rotating speed under the vehicle installment state.

Determine the eigentone 100Hz of right side jack shaft by local frequencies response function test method, and draw the effective resonance mass of the needed quality bump leveller of preferable effectiveness in vibration suppression should be 450 the gram.But because the vehicle space layout restrictions, 450 required gram mass bodies of this quality bump leveller can't adapt to the restriction of space layout.Yet, when adopting the quality bump leveller of less mass, for example, when the quality bump leveller (manufacturing process error 5%) that 130Hz is installed in the position of right side jack shaft permission, the result shows that 3000-3600 rev/min is located vibration and noise problem has clear improvement, but has occurred new vibration noise problem near 2400 rev/mins; When the quality bump leveller (manufacturing process error 5%) that 100Hz is installed in the position of right side jack shaft permission, the result shows that 2600-3200 rev/min of vibration noise problem obviously improve, but has occurred new vibration noise problem near 4000 rev/mins.Exactly because the restriction of vehicle space layout can't be designed the quality bump leveller that satisfies frequency and weight requirement as required, makes the design proposal that is difficult to continue by routine solve this problem.

Therefore, the utility model just is being based on above problem and is proposing a kind of notion of new two quality bump levellers, and its space layout that can either adapt to vehicle limits, and can satisfy needed frequency of absorbing and quality requirement again.Below with reference to accompanying drawing the utility model is described in detail.

Vehicle of the present utility model (not shown) comprises vehicle drive shaft 100, as shown in Figure 2.Vehicle drive shaft 100 comprises and is used for driving force is sent to respectively the left side jack shaft 102 and the right side jack shaft 101 of left and right driving wheel (not shown), and wherein right side jack shaft 101 is for making a long driver moving semiaxis, and left side jack shaft 102 is for lacking jack shaft.

Installation quality bump leveller 200 on vehicle drive shaft 100, quality bump leveller 200 utilize frequency energy absorbing principle to absorb the vibrational energy of vehicle drive shaft 100, thereby suppress or weaken the vibration of vehicle drive shaft 100 natural frequency under the vehicle installment state.Preferably, quality bump leveller 200 of the present utility model is installed in right side jack shaft 101 promptly makes a long driver to move on the semiaxis, is used to absorb the vibrational energy of right side jack shaft 101 natural frequency under the vehicle installment state.In the present embodiment, the natural frequency of right side jack shaft 101 under the vehicle installment state is 100Hz.

Quality bump leveller 200 of the present utility model is an a kind of pair of quality bump leveller 200, and be a hollow cylindrical, it comprises first absorbing subtense angle 1 with the vibrational energy that absorbs first frequency and the second absorbing subtense angle 2 with the vibrational energy that absorbs second frequency, and separate interval is provided with between the first absorbing subtense angle 1 and the second absorbing subtense angle 2, and the two is not connected each other.Why with separate setting between the first absorbing subtense angle 1 and the second absorbing subtense angle 2 so that the two be not connected each other, be when vehicle drive shaft 100 is vibrated, axial displacements to take place and mutual interference mutually with the second absorbing subtense angle 2 with respect to vehicle drive shaft 100 for fear of the first absorbing subtense angle 1, if the first absorbing subtense angle 1 and the second absorbing subtense angle 2 interconnect, then when vehicle drive shaft 100 vibrations, axial deformation can take place in the connection part of the first absorbing subtense angle 1 and the second absorbing subtense angle 2, the resonance of absorbing subtense angle 1 generation of winning and the resonance of the second absorbing subtense angle, 2 generations are combined, cause the absorbing effect of the first absorbing subtense angle 1 and the second absorbing subtense angle 2 to reduce, thereby do not reach the purpose that expection is provided with two absorbing subtense angles.For this reason, first absorbing subtense angle 1 of the present utility model and the 2 separate settings of the second absorbing subtense angle can be avoided influencing each other between the two.

The first absorbing subtense angle 1 by first mass 11 and first elastomer 12 that is used to support first mass 11 form.The second absorbing subtense angle 2 by second mass 21 and second elastomer 22 that is used to support second mass 21 form.

As shown in Figure 4, shown in the frequency of the first absorbing subtense angle, 1 correspondence and its quality and the following formula of flexible relation:

$\mathrm{\&omega;}1=\sqrt{\frac{k1}{\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="H200920214349XE00012.png,H200920214349XE00021.png"\; state="\{\{state\}\}">m</figure-callout>}1}}$

Wherein ω 1 is the frequency of the first absorbing subtense angle, 1 correspondence, and k1 is the elasticity coefficient of first elastomer 12 in the first absorbing subtense angle 1, and m1 is the quality of first mass 11 in the first absorbing subtense angle 1.

Shown in the frequency of the second absorbing subtense angle, 2 correspondences and its quality and the following formula of flexible relation:

$\mathrm{\&omega;}2=\sqrt{\frac{k2}{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="H200920214349XE00012.png,H200920214349XE00021.png"\; state="\{\{state\}\}">m</figure-callout>}2}}$

Wherein ω 2 is the frequency of the second absorbing subtense angle, 2 correspondences, and k2 is the elasticity coefficient of second elastomer 22 in the second absorbing subtense angle 2, and m2 is the quality of second mass 21 in the second absorbing subtense angle 2.

The first absorbing subtense angle 1 absorbs the vibrational energy that right side jack shaft 101 promptly makes a long driver to move semiaxis natural frequency under the vehicle installment state, and the second absorbing subtense angle, 2 absorptances make a long driver to move the vibrational energy of the semiaxis frequency that natural frequency is higher under the vehicle installment state, and promptly ω 2＞ω 1.In the present embodiment, the frequencies omega 1=100Hz of the first absorbing subtense angle, 1 correspondence, and the frequencies omega 2=130Hz of the second absorbing subtense angle, 2 correspondences.

First mass 11 of the present utility model and second mass 21 identical in quality, that is, and m1=m2, and all be to form by the metallic material with less quality, for example be iron ring etc.In the present embodiment, the quality of first mass 11 and second mass 21 is 175 grams.Second mass 21 of first mass 11 of the first absorbing subtense angle 1 and the second absorbing subtense angle 2 is arranged to have identical quality and all is that metallic material by less quality forms, be in order to adapt to the narrow and small restriction of vehicle space layout, thereby in the limited space of vehicle, the quality bump leveller 200 that satisfies needed respective frequencies of absorbing and quality requirement be installed.As shown in Figure 3, each in first mass 11 and second mass 21 also is hollow cylindrical, and its internal diameter is greater than the external diameter of vehicle drive shaft 100.

As shown in Figure 3, first elastomer 12 and second elastomer 22 all are to be formed by suitable rubber material, and are respectively fixed on first mass 11 and second mass 21 by vulcanization.In the present embodiment, first elastomer 12 is different with the hardness of second elastomer 22, that is to say, first elastomer 12 has different elasticity coefficient respectively with second elastomer 22, i.e. k1 ≠ k2, and, can draw k2＞k1 from top formula.In addition, in the present embodiment, the first absorbing subtense angle 1 and the second absorbing subtense angle 2 are except the hardness of first elastomer 12 and second elastomer 22 is different, and other structures of the first absorbing subtense angle 1 and the second absorbing subtense angle 2 are identical.

First elastomer 12, second elastomer 22 comprises respectively and covers first mass 11 fully, the interior thinner wall section 120 of the inner peripheral surface of second mass 21,220, cover first mass 11 fully, the outer thinner wall section 122 of the outer circumferential face of second mass 21,222, from interior thinner wall section 120,220 and outer thinner wall section 122, two joints 124 holding relative tilt extension vertically to axial of 222,224 and respectively from two relative joints 124, the extension part 126 that 224 axial end extends outwardly vertically, 226 and fixing part 128,228.On the outer circumferential face of the fixing part 128,228 of first elastomer 12 and second elastomer 22, be respectively equipped with annular groove 129,229.By clamp 3 is stuck in the annular groove 129,229, thereby the first absorbing subtense angle 1 and the second absorbing subtense angle 2 are stably fixed on the right side jack shaft 101.

Thereby the interior thinner wall section 120,220 of first, second elastomer 12,22 and outer thinner wall section 122,222 are oppositely arranged on the inboard and the outside of first, second mass 11,21 first, second mass 11,21 are coated on wherein fully.First and second mass 11,21 of the first absorbing subtense angle 1 and the second absorbing subtense angle 2 are coated between the interior thinner wall section 120,220 and outer thinner wall section 122,222 of its elastomer 12,22 fully, thereby effectively prevent the metal erosion of first, second mass 11,21.

The minimum diameter of first, second elastomer 12,22, promptly first, second elastomer 12,22 internal diameter essence of being used to cover the position of right side jack shaft 101 equals the internal diameter of right side jack shaft 101.In the present embodiment, the internal diameter essence of elastomeric extension part and fixing part equals the internal diameter of right side jack shaft 101.The internal diameter of the interior thinner wall section 120,220 of first, second elastomer 12,22 is greater than the minimum diameter of first, second elastomer 12,22, the internal diameter of interior thinner wall section 120,220 that is first, second elastomer 12,22 is greater than the internal diameter of right side jack shaft 101, thereby the interior thinner wall section 120,220 of right side jack shaft 101 and first, second elastomer 12,22 forms the annular space 123,223 of along the circumferential direction extending radially between the facing surfaces.

When on the right side jack shaft 101 that the first absorbing subtense angle 1 and the second absorbing subtense angle 2 is respectively installed to vehicle, first mass 11 and second mass 21 respectively by yielding support on first elastomer 12 and second elastomer 22, the vibration of right side jack shaft 101 can be so that radial displacement can take place with respect to right side jack shaft 101 in the first absorbing subtense angle 1 and the second absorbing subtense angle 2, and then win absorbing subtense angle 1 and the second absorbing subtense angle 2 are resonated, thereby the quality bump leveller 200 that is made of the first absorbing subtense angle 1 and the second absorbing subtense angle 2 absorbs right side jack shafts 101 vibration of natural frequency and vibration of higher frequency thereof under the vehicle installment state.

Fig. 5 compares schematic representation for the performance that quality bump leveller 200 of the present utility model is installed in vehicle drive shaft 100 front and back.As shown in Figure 5, after on the vehicle drive shaft 100 of vehicle quality bump leveller 200 of the present utility model being installed, all under score, the acceleration noise in the visible vehicle has obvious reduction to the acceleration noise in the vehicle, satisfies set objective.For reducing the jack shaft vibration, reduce the vibrational energy that is delivered to vehicle body, overcome the limiting factor of car load space layout etc. simultaneously, the utility model creatively adopts two different frequencies, two quality bump levellers 200 designs of less quality, wherein the frequency of the first absorbing subtense angle, 1 correspondence is 100Hz, the frequency of the second absorbing subtense angle, 2 correspondences is 130Hz, and the quality of second mass 21 of first mass 11 of the first absorbing subtense angle 1 and the second absorbing subtense angle 2 is 175 grams, thereby the effectiveness in vibration suppression of two height absorbing subtense angles is superposeed under 100Hz, solved the very big problem of jack shaft resonance energy; Utilize the big advantage of absorbing frequency span of high and low frequency absorbing subtense angle simultaneously, guaranteed 1000-6000 rev/min of Nei Chenei favorable damping of engine running velocity range noise reduction.

Of the present utility model pair of quality bump leveller 200 solved car internal resonance and the resonance noise problem of vehicle in accelerating process well, improved greatly and driven noise circumstance in the car, improved the vehicle drive integrated quality, has good practicability.

Though the utility model is in this demonstration and description, wherein imagination is most realistic and embodiment preferred, can recognize, in scope of the present utility model, can make a change, be not to be only limited to details described herein, but to meet the four corner of claims, to comprise any and all equality units and equipment.

Claims (10)

1. a quality bump leveller (200), it comprises having two absorbing subtense angles (1,2) that absorb the vibrational energy of different frequency, described each absorbing subtense angle (1,2) is made up of mass (11,21) and the elastomer (12,22) that is used to support described mass, it is characterized in that the separate setting under installment state of described two absorbing subtense angles.

2. quality bump leveller as claimed in claim 1 (200), wherein, the mass (11,21) of described two absorbing subtense angles (1,2) all is to be formed and had an essentially identical quality by metallic material, but the hardness difference of the elastomer (12,22) of the mass (11,21) of described two absorbing subtense angles (1,2).

3. quality bump leveller as claimed in claim 2 (200), wherein, described absorbing subtense angle (1,2) is for having the hollow cylindrical of shaft axis, and the mass (11,21) of described each absorbing subtense angle (1,2) is fixed in its elastomer (12,22).

4. quality bump leveller as claimed in claim 3 (200), wherein, each elastomer (12,22) coats described mass (11,21), and form interior thinner wall section (120,220) in a side of the close described shaft axis of described mass (11,21), and outside the side away from described shaft axis of described mass (11,21) forms thinner wall section (122,222), and the internal diameter of interior thinner wall section (120,220) is greater than the minimum diameter of elastomer (12,22).

5. as each described quality bump leveller (200) of claim 1-4, wherein, each absorbing subtense angle (1,2) also comprises clamp (3), the outer circumferential face of each described elastomer (12,22) is provided with annular groove (129,229), and described clamp (3) is used for fixing respectively in described circular groove (129,229).

6. a vehicle drive shaft (100), it can rotate so that driving force is sent to driving wheel, it is characterized in that, and it comprises with described vehicle drive shaft (100) coaxial mounted as each described quality bump leveller (200) of claim 1-5.

7. vehicle drive shaft as claimed in claim 6 (100), it comprises and is used for making a long driver moving semiaxis (101) and lack jack shaft (102) with what driving force was sent to driving wheel respectively, wherein, described two absorbing subtense angles (1,2) are installed in axially spaced-apart and make a long driver to move on the semiaxis (101).

8. vehicle drive shaft as claimed in claim 7 (100), wherein, the elastomer of described quality bump leveller (200) (12,22) supports the annular space (123,223) that forms between the position of described mass (11,21) and the live axle (100) along live axle (100) extending circumferentially.

9. a vehicle is characterized in that, each described vehicle drive shaft (100) as claim 6-8 wherein is installed.

10. vehicle as claimed in claim 9, it is characterized in that, described vehicle drive shaft (100) has the natural frequency of measuring under the vehicle installment state, the frequency of the vibrational energy of an absorption of one of them absorbing subtense angle (1) of described quality bump leveller (200) equals described natural frequency, and the frequency of the vibrational energy that another absorbing subtense angle (2) absorbs is greater than described natural frequency.

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