CN102401086A - Torsional vibration absorber - Google Patents
Torsional vibration absorber Download PDFInfo
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- CN102401086A CN102401086A CN2011101911022A CN201110191102A CN102401086A CN 102401086 A CN102401086 A CN 102401086A CN 2011101911022 A CN2011101911022 A CN 2011101911022A CN 201110191102 A CN201110191102 A CN 201110191102A CN 102401086 A CN102401086 A CN 102401086A
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Abstract
The invention relates to a torsional vibration absorber, which comprises a casing, a cover plate, an accommodation cavity, an inertia body, damping substances and at least one limiting bearing, wherein the cover plate is welded and sealed with the casing; the accommodation cavity is defined by the casing and the cover plate; the inertia body is positioned in the accommodation cavity and is provided with at least one annular groove; the damping substances are filled in the accommodation cavity and the groove in the inertia body; the at least one limiting bearing is positioned between the inertia body and the accommodation cavity; the casing is provided with a stress end surface called as a first end surface and a non-stress end surface called as a second end surface; a combined part between the cover plate and the casing is positioned on the second end surface; and the casing is integrally formed by spinning. The torsional vibration absorber has the advantages of simple structure, low noise and favorable vibration absorbing performance; the casing of the torsional vibration absorber is simultaneously used as a belt pulley, so that the space is saved and the cost is reduced; and the casing formed by spinning has high strength and favorable vibration absorbing performance.
Description
Technical field
The present invention relates to a kind of device of eliminating rotary axis vibrating, particularly a kind of torsional vibration damper.
Background technique
In each rotary axis; Often use a kind of adjust the torsional vibration of shafting frequency or utilize the damping factor dissipate axle system excitation energy or have frequency modulation concurrently and the vibration damping equipment of two kinds of effects of damping, the automobile engine crankshaft that has common in practical application is used the damp type torshional vibration damper.
For example, automobile engine crankshaft is the vibrative main inherent source of car body, the vibration that a vibration damper alleviates motor car engine itself is set, a kind of effective active damping measure of can yet be regarded as.The working principle of this type of vibration damper is that shock absorber casing is connected with bent axle, and shock absorber casing passes to the torsional vibration inertial mass and is in basically in the housing on the coasting body of state of suspension and the damping material between the two.During engine operation; Shock absorber casing vibrates with bent axle; Because inertial mass lags behind shock absorber casing, thereby between coasting body and housing, produces relative movement, and the damping material is rubbed back and forth; Vibrational energy is absorbed by the interior frictional damping of damping material, thereby makes the torsional oscillation of bent axle be able to subdue.
Vibration damper of the prior art has the housing that is formed by steel plate die casting usually, and this housing can be connected with bent axle, forms enclosed cavity by a side cover and shock absorber casing, is adorning the torsional vibration inertial mass body in it.Leave certain clearance between inertial mass body and the enclosed cavity, the inside is full of high viscosity damping thing, for example silicone oil.When engine operation, shock absorber casing rotates, vibrates together with bent axle.Because inertial mass is quite big, so between coasting body and shock absorber casing, produce relative movement.The vibrational energy of bent axle is absorbed by the interior frictional damping of silicone oil, makes torsional oscillation eliminate or alleviate.This silicone oil torsional vibration damper good damping result, stable performance, reliable operation, simple in structure, easy to maintenance, so the application on motor car engine is more prevalent.
But above-mentioned silicon oil damper also comes with some shortcomings, and specifically, the design of vibration damping equipment mainly is to confirm three major parameters of vibration damping equipment, is respectively rotary inertia, rigidity and damping.The change of arbitrary parameter all can change the torsional vibration characteristic of bent axle in above-mentioned three, and therefore the design to vibration damping equipment is selected best parameter in essence.Because in design during vibration damping equipment, rotary inertia generally confirms, and damping to the influence of torsional oscillation usually less than the influence of rigidity to torsional oscillation, in design, mainly be that rigidity is chosen therefore.
Yet the housing rigidity of traditional die cast is relatively poor, has the invisible flaws of naked eyes such as turning pore, shrinkage cavity, sand holes easily between the casting point, and is as shown in Figure 1, produce these casting defects 1 after, will reduce its effective bearing area,
And around pore, can cause stress to concentrate and the impact resistance and the fatigue resistance of reduction foundry goods.Defective also can reduce the compactness of foundry goods, causes foundry goods to be scrapped.In addition, defective also has bad influence to the corrosion resistance and the heat resistance of foundry goods.Seem and obtained complete profile though have the foundry goods of above-mentioned defective, innerly leave not full fully some small spaces, the mechanical property of foundry goods is badly damaged.Consequence is to cause the vibration damper balance bad, reduction of service life, even the peril of generation crankshaft breakdown.
The control device of casting defect is also quite loaded down with trivial details, can be referring to " casting Technology Design and casting defect control " (author Li Chenxi ISBN:9787122045249) that on April 1st, 2009, Chemical Industry Press published and " analysis of foundry goods latent defect and prevent " (author: yellow will light ISBN:978-7-111-32508-6) that in January, 2011, China Machine Press published.Simultaneously, because casting efficient is lower, and the casting density that casting die time difference causes has difference, so the quality control of vibration damper is difficult to ensure really.
Summary of the invention
The object of the present invention is to provide a kind of rigidity strong, compact structure, work efficiency is high, and noise is low, and the torsional vibration damper that damping property is good is to satisfy the needs of practical application.
For realizing the object of the invention, realize through following technological scheme:
A kind of torsional vibration damper; Comprise housing, and the cavity volume, the coasting body in cavity volume that surround of cover plate, housing and the cover plate of said housing welded seal, fill damping thing, at least one Limit Bearing between said coasting body and said cavity volume and the connection set that is used to install said vibration damper in the groove of said cavity volume and said coasting body with at least one annular groove; Wherein said housing has stressed end face that is called as first end face and the non-stress end face that is called as second end face; The binding site of said cover plate and said housing is in said second end face, and said housing is to adopt the integrally formed integral structure of spinning.
Preferably, said housing outer surface also is provided with pulley groove.
Said housing can adopt cast iron, aluminum alloy, magnesium alloy or magnesium-aluminium alloy material to process.In order to obtain better damping property and to reduce noise, preferably, adopt magnesium alloy materials to process.
The central part of said housing is provided with through said first end face and is used for torsional vibration damper is installed in the center through hole on the running shaft.Also be provided with the some through holes that supply the torsional vibration damper fix in position around the said center through hole, perhaps, said center through hole inside is worm structure, supplies the torsional vibration damper fix in position.
First end face of said housing and/or second end face outside also are provided with radiating fin.
The invention has the beneficial effects as follows, provide a kind of rigidity strong through adopting above-mentioned technological scheme, compact structure; Work efficiency is high; Noise is low, and torsional vibration damper that damping property is good and production method thereof are because housing is the integral structure that adopts mould pressing technology integral body to process; Avoid the generation of casting defect effectively, improved casting efficient and casting quality; Simultaneously, the connecting part of cover plate and housing is arranged on second end face that does not stress, has weakened the weld seam joint because the risk of breakage that meets with stresses and cause makes that the bulk strength of torshional vibration damper is higher; And, in the spinning process process, also pulley groove being arranged at housing outer wall integrated molding, shock absorber casing double as belt pulley has been practiced thrift the space, has reduced cost.
Description of drawings
Fig. 1 is the casting defect common location schematic representation of vibration damper in the existing technology
Fig. 2 is a product appearance schematic representation of the present invention
Fig. 3 is an internal structure schematic representation of the present invention
Fig. 4 be among Fig. 3 A-A to sectional drawing
Fig. 5 is a casing blank change of shape schematic representation before and after the spinning
Fig. 6 is a pulley groove Common Shape schematic representation
Fig. 7 is that the pulley groove Common Shape is split the blank structure schematic representation
Fig. 8 is the damper structure schematic representation that housing periphery spinning has pulley groove
Fig. 9 is the position view that belt pulley and vibration damper are installed separately
Figure 10 is the damper structure schematic representation that has radiating fin
Each label proxy component and part name are following in the accompanying drawing:
1 casting defect
2 housings
3 cover plates
4 gaps
5 coasting bodies
6 annular grooves
7 Limit Bearings
8 through holes
9 bolts
10 chassis
11 center through hole
12 preformed holes
13 running shafts
14 first end faces
15 second end faces
16 belt pulleys
17 radiating fin
Embodiment
Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
The present invention provides a kind of torsional vibration damper; With reference to Fig. 2 and Fig. 3; Have coasting body 5 in the cavity volume (not shown) that this vibration damper comprises housing 2, surround with cover plate 3, housing and the cover plate of said housing 2 welded seals, the cavity volume, in general this coasting body is annular disk-shaped; Have roughly close shape so that this coasting body can be placed within the said cavity volume with cavity volume, this coasting body can be processed by the various materials of required weight grade: metal for example is alloy, Tungsten carbite etc. like steel, iron, alloyed steel, aluminium, magnesium, bronze, aluminum alloy, magnesium alloy, copper-zinc-aluminium system, iron-chromium-molybdenum system and copper-manganese; Stupalith for example again; Like ceramic matric composites such as silicon nitride, silicon carbide, above-mentioned material is high temperature resistant, wear-resistant because of himself possessing, high tenacity and rigidity, erosion-resisting characteristic, therefore is suitable as very much the inertial mass body of torshional vibration damper; By that analogy, has the selection that other materials of characteristic so also can be used as the coasting body of torshional vibration damper.Preferably, the physical property of coasting body is following: tensile strength 6.32Mpa, and yield strength 5.85Mpa, 1cm specific elongation 1.5%-1.8%, Young's modulus 220640Mpa, rigidity 115836Mpa, coefficient of linear expansion ℃ is 0.56*10
-5, Brinell hardness 250/290.
Said housing 2 should possess enough intensity, deforms in rotary collision to prevent housing, causes that the gap between housing and the coasting body is too small or stuck, causes defective shock absorber.Generally speaking; The rotary inertia of coasting body accounts for 60% of whole torsional vibration damper rotary inertia; This ratio can be according to selecting for use material different to change, for example: when housing adopts steel and coasting body when adopting heavy metal, this ratio will be increased to about 75%; When housing adopts light alloy and coasting body when using steel, this ratio can be increased to 80%-90%.For peripheral stress and radial stress that bearing of safety produces because of rotation, in actual design, the thickness of housing is got 1/50 to 1/60 of coasting body diameter usually; The inner and outer diameter ratio range of coasting body is 0.2-0.6; Coasting body width and outer diameter ratio range are 0.3-0.7.From lighter this thinking of more effective vibration damper of design, a large diameter thin inertia annulus is a comparatively ideal selection, and also helping product simultaneously like this has a bigger tolerance range, is convenient to production and processing.
Torsional vibration damper in the course of the work; Said coasting body is in state of suspension basically in cavity volume, that is to say, there are certain clearance 4 in coasting body and inner walls; As shown in Figure 3; Have annular groove 6 on the said coasting body 5, the viscosity size of each gap of vibration damper and damping thing is all influential to effectiveness in vibration suppression, should adjust by designing requirement.The coasting body of vibration damper generally equates with the axial of inner walls and radial clearance size; Minimum 0.2mm, maximum 9.8mm successful Application mistake once all in actual engineering; Preferably span is between 0.385mm-0.761mm, and more preferably span is between 0.5mm-0.75mm.Simultaneously, also find through experiment, coasting body annular groove 6 apart from inner walls axially with the radial clearance size to the influence of torshional vibration damper rotary inertia less than the influence of the axial and radial clearance size of coasting body and inner walls to the torshional vibration damper rotary inertia.
Fill the damping thing in the annular groove 6 of said cavity volume and said coasting body, select high viscosity liquid for example silicone oil, mercury etc. usually for use, also can select the semisolid emplastic of solid for use, for example rubber.No matter select which kind of material for use, should pay close attention to the sticking coefficient of density, kinematical viscosity, relative velocity and temperature of damping thing, calculate preferable damping value.Preferably, select for use the bigger fluid of viscosity with relatively poor lubrication property for example silicone oil as the damping thing.
Silicone oil is to be the linear polydimethylsiloxane fluid of end group with the trimethylsiloxy group; Have good heat-resisting, resistance to oxidation, low temperature resistant, can in-50 ℃ to+180 ℃ temperature ranges, use for a long time, shear resistant is strong; Compressibility reaches 20 times of general mineral oil, is desirable hydraulic spring.The sticking coefficient of the temperature of silicone oil is low, low surface tension, good hydrophobicity and lubricity, and breakdown voltage resistant height, anti-electric arc, dielectric consumption are little, to the effect of human non-toxic evil.In a vacuum, can use for a long time below 200 ℃.The proportion of silicone oil is less than 1, and self-ignition point is about 480 ℃, and the silicone oil compressibility increases with viscosity and diminishes.
The high viscosity of silicone oil makes silicon oil damper to obtain best damping torque through rational oil slick thickness and silicone oil viscosity, can form the silicone oil of new viscosity after the silicone oil of two kinds of different viscositys mixes.The effective serviceability temperature scope of suitable silicone oil is-40 ℃ to 150 ℃, crosses when low when temperature, and silicone oil causes silicon oil solidifying easily near solidifying point; When temperature is too high, the viscosity of silicone oil will sharply descend, and the two all will cause defective shock absorber.It should be noted that nominal kinematical viscosity in the silicone oil specification on sale records under very low and 25 ℃ of standard temperatures at shearing rate, should revise according to shearing factor and operating temperature in actual the enforcement.
Be provided with Limit Bearing 7 between said coasting body 5 and the said housing 2; Can select for use the Teflon plastic material to process; Guarantee coasting body 5 in housing 2, can freely rotate and do not have significantly to move radially; It also can be a plurality of that the quantity of bearing can be 1, preferably is provided with 2, lays respectively between coasting body 5 and the inner walls and near the two ends up and down of housing internal diameter.
Said housing 2 has stressed end face that is called as first end face 14 and the non-stress end face that is called as second end face 15; Described here stressed refer to torshional vibration damper be fixed in connected element in the working environment the warping stress of directly bearing and conducting; The binding site of said cover plate 3 and said housing 2 is in said second end face 15, so this connecting part is not directly to bear described warping stress.Why do this design, be because said cover plate 3 and said housing 2 combine normally adopt welding technique to accomplish, promptly be the metal that thermal source is bombarded the weldment joint, make its Flashmelt, cool off the purpose that reaches welding then rapidly.Defectives such as incomplete fusion, undercut, weld seam sink, pore, crackle generally can appear in the welded joint of melting, cause the weldment stress-bearing capability poor.Even the welding process defective is ignored; Also objective reality weld seam and housing stressed, be heated, the situation of pressurized varying degree; Particularly when torshional vibration damper was worked, the vibration damper that turns round with axle system bore huge rotation stress, and the application of force at butt welded seam place is bigger; Therefore the present invention is arranged at said second end face 15 with the connecting part of said cover plate 3 and said housing 2, and avoiding the said cover plate 3 and the connecting part of said housing 2 is that the weld joint is stressed.
Said housing 2 adopts the rotary pressure technology global formation; Making step is following: the phase I; Shown in Fig. 5 a, 5b, 5c, at first make the sheetmetal blank of a circle, through calculating with known technology; The volume of this blank is suitable for being processed to the shock absorber casing that thickness of slab is 3mm-9mm, and this process is called base; Be installed to the blank of making in the rotation mandrel of spinning machine then, the preheating spinning machine makes the blank material be preheating to 180 ℃～220 ℃, and operating temperature then remains on 220 ℃～300 ℃; Select the wheel of riving of a suitable angle according to the needs of shock absorber casing size; Rive the top angle of wheel between 30 °～120 °; With the wheel of riving blank opened at thickness direction and to have a certain degree; Advance gradually with briquetting roller again, mould pressing, rotation mandrel speed setting value is 350～1000r.min
-1, feed speed is 100～300mm.min
-1, spinning force is 0.8～75.2KN.Second stage; As shown in Figure 8; At housing outer surface rotary press modelling pulley groove, predictable shape is respectively tower, V-type and poly Vbelt type shown in Fig. 6 a, 6b, 6c, and its corresponding spinning belt pulley groove structural feature is respectively shown in Fig. 7 a, 7b, 7c; Its spinning steps in sequence be on the housing that machines in the phase I with tentatively the rive blank of belt wheel of the wheel of riving, advance spinning to get final product with briquetting roller then; The housing of phase III after to above-mentioned spinning carries out surface treatment with known technology.The housing outer surface can selectively not be provided with pulley groove yet, but with belt pulley 16 extra installing, as shown in Figure 9, in such cases, need not carry out the step of above-mentioned second stage.
Like Fig. 2 and shown in Figure 4, be reserved with the preformed hole 12 that injects the damping thing on the cover plate 3, after injecting the damping thing, with these preformed hole 12 welded seals.Said preformed hole 12 has two, and one is hand-hole, and another is an exhaust port, and two preformed holes are distributed in along the radially relative both sides of housing.
Said housing can adopt cast iron, aluminum alloy, magnesium alloy or magnesium-aluminium alloy material to process.In order to obtain better damping property and reduction noise, the present invention preferably adopts magnesium alloy materials to process.
Vibration damper is fastenedly connected through connection set and running shaft, and described connection set is the center through hole 11 through said first end face 14 that is positioned at housing 2 central parts.Can also be provided with the some through holes 8 that supply the torsional vibration damper fix in position around the said center through hole 11, bolt 9 passes through hole 8 shock absorber casing 2 is fixedly connected with running shaft 13; Or; Described connection set can also be that center through hole 11 machined become worm structure, supplies the torsional vibration damper fix in position, in such cases; Center through hole 11 is the unique holes on the chassis 10 of vibration damper; With respect to the fastening scheme of bolt 9, this is a kind of compacter design, meets the design demand that the vibration damper installing space is narrow and small and number of spare parts had requirement.
As shown in Figure 8; The diameter of said center through hole 11 is more little; Might make torsional vibration damper obtain bigger coasting body quality more, thereby embody bigger superiority, the design factor relevant with the coasting body quality also has the wall thickness of housing; Through calculating; When the housing wall thickness be coasting body annulus outer diameter 1/26～1/28 the time, and when the diameter of central through hole≤1/5 diameter of the housing R, can obtain the inertial mass body of maximum volume and can accomplish to save material and balance that rotary inertia is optimum.During the diameter of center through hole≤60mm, the needs that the time of can satisfying is used; More preferably, the diameter≤30mm of center through hole.
Vibration damper changes into heat energy with vibrational energy in the vibration damping process; For guaranteeing the vibration damper proper functioning; The temperature of the especially internally-damped thing of vibration damper can not be too high; The vibration damper temperature exceeding standard only occurs under the high-revolving operating mode of high load usually, need take this time measures necessary vibration damper is cooled off to prevent that vibration damper Yin Wendu is too high and to lose efficacy.Shown in figure 10, long-pending at first end face and/or the second end face arranged outside radiating fin 17 of said housing to increase damper surface, the consumed power of reduction per unit area.The sheet type periphery of radiating fin is substantially equal to the disc surfaces of vibration damper; Can be according to the dissimilar tooth form of the concrete design radiating fin of consumed power difference; According to experimental result; The every square metre of consumed power in silicon oil damper surface is less than 6.64 kilowatt hours, and working state lower shell body temperature is not higher than 115 ℃, can safe handling.
Principle of the present invention and embodiment as previously mentioned, yet protection scope of the present invention has more than and is limited to above specific embodiment.The embodiment who goes out shown in the present is schematic rather than restrictive.Other staff can change under the enlightenment prerequisite of the present invention and change not breaking away from, and adopt the method that is equal to therewith, and the method that all these change, change and are equal to all drops within claims scope that limits like the present invention.
Claims (8)
1. torsional vibration damper possesses:
Housing,
With the cover plate of said housing welded seal,
The cavity volume that housing and cover plate surround,
Be positioned at the coasting body with at least one annular groove of cavity volume,
Fill the damping thing in the groove of said cavity volume and said coasting body,
At least one Limit Bearing between said coasting body and said cavity volume,
Be used to install the connection set of said vibration damper, it is characterized in that,
Said housing has stressed end face that is called as first end face and the non-stress end face that is called as second end face, and the binding site of said cover plate and said housing is in said second end face, and said housing adopts the spinning unitary moulding.
2. torsional vibration damper according to claim 1 is characterized in that, said housing outer surface also is provided with pulley groove.
3. torsional vibration damper according to claim 2 is characterized in that, said housing adopts magnesium alloy materials to process.
4. torsional vibration damper according to claim 3; It is characterized in that; Said connection set has the center through hole with the torsional vibration damper installation in position that is used for through said first end face of the central part that is positioned at housing, and the diameter of said center through hole is not more than 60mm.
5. torsional vibration damper according to claim 4 is characterized in that the diameter of said center through hole is not more than 30mm.
6. torsional vibration damper according to claim 5 is characterized in that, also is provided with through some through holes of the confession torsional vibration damper fix in position of said first end face around the said center through hole.
7. torsional vibration damper according to claim 5 is characterized in that, said center through hole inside is worm structure, supplies the torsional vibration damper fix in position.
8. according to claim 6 or 7 described torsional vibration dampers, it is characterized in that first end face of said housing and/or the second end face arranged outside have radiating fin.
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| CN2011101911022A CN102401086A (en) | 2011-06-29 | 2011-06-29 | Torsional vibration absorber |
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|---|---|---|---|
| CN2011101911022A CN102401086A (en) | 2011-06-29 | 2011-06-29 | Torsional vibration absorber |
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| CN102401086A true CN102401086A (en) | 2012-04-04 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854674A (en) * | 2018-12-06 | 2019-06-07 | 熵零技术逻辑工程院集团股份有限公司 | A kind of torsional vibration damper |
| CN112709783A (en) * | 2019-10-25 | 2021-04-27 | 现代自动车株式会社 | Viscous damper for crankshaft of vehicle |
| CN114060465A (en) * | 2020-07-31 | 2022-02-18 | 上海海立电器有限公司 | Compressor and damper thereof |
| CN114531894A (en) * | 2019-09-12 | 2022-05-24 | 贝克休斯油田作业有限责任公司 | Viscous vibration damping of torsional oscillations |
| CN115182965A (en) * | 2022-06-24 | 2022-10-14 | 山东交通学院 | Damping torsional vibration damper |
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| DE4328596A1 (en) * | 1993-08-25 | 1995-03-02 | Metzeler Gimetall Ag | Arrangement for damping vibrations on crankshafts |
| CN101502874A (en) * | 2009-03-23 | 2009-08-12 | 青岛地恩地材料科技有限公司 | Method for producing shock-absorbing belt pulley hub and shock-absorbing belt pulley employing the hub |
| CN101539183A (en) * | 2008-03-18 | 2009-09-23 | 湖北广奥减振器制造有限公司 | Silicon oil damper |
| CN101672340A (en) * | 2009-08-18 | 2010-03-17 | 山东光大机械制造有限公司 | Silicone oil shock absorber shell and manufacturing method thereof |
| CN201763885U (en) * | 2010-08-30 | 2011-03-16 | 宁波赛德森减振系统有限公司 | Heat radiating device of engine silicone oil torsion vibration damper |
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2011
- 2011-06-29 CN CN2011101911022A patent/CN102401086A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4328596A1 (en) * | 1993-08-25 | 1995-03-02 | Metzeler Gimetall Ag | Arrangement for damping vibrations on crankshafts |
| CN101539183A (en) * | 2008-03-18 | 2009-09-23 | 湖北广奥减振器制造有限公司 | Silicon oil damper |
| CN101502874A (en) * | 2009-03-23 | 2009-08-12 | 青岛地恩地材料科技有限公司 | Method for producing shock-absorbing belt pulley hub and shock-absorbing belt pulley employing the hub |
| CN101672340A (en) * | 2009-08-18 | 2010-03-17 | 山东光大机械制造有限公司 | Silicone oil shock absorber shell and manufacturing method thereof |
| CN201763885U (en) * | 2010-08-30 | 2011-03-16 | 宁波赛德森减振系统有限公司 | Heat radiating device of engine silicone oil torsion vibration damper |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854674A (en) * | 2018-12-06 | 2019-06-07 | 熵零技术逻辑工程院集团股份有限公司 | A kind of torsional vibration damper |
| CN114531894A (en) * | 2019-09-12 | 2022-05-24 | 贝克休斯油田作业有限责任公司 | Viscous vibration damping of torsional oscillations |
| CN112709783A (en) * | 2019-10-25 | 2021-04-27 | 现代自动车株式会社 | Viscous damper for crankshaft of vehicle |
| CN114060465A (en) * | 2020-07-31 | 2022-02-18 | 上海海立电器有限公司 | Compressor and damper thereof |
| CN115182965A (en) * | 2022-06-24 | 2022-10-14 | 山东交通学院 | Damping torsional vibration damper |
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Application publication date: 20120404 |