CN104912995B - Hydraulic bushing in vehicle suspension system guide device and vehicle - Google Patents

Hydraulic bushing in vehicle suspension system guide device and vehicle Download PDF

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Publication number
CN104912995B
CN104912995B CN201410094113.2A CN201410094113A CN104912995B CN 104912995 B CN104912995 B CN 104912995B CN 201410094113 A CN201410094113 A CN 201410094113A CN 104912995 B CN104912995 B CN 104912995B
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China
Prior art keywords
primary elastomeric
elastomeric body
hydraulic bushing
rubber
liquid room
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CN201410094113.2A
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CN104912995A (en
Inventor
刘燕
王更胜
谷玉川
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Guangzhou Automobile Group Co Ltd
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Guangzhou Automobile Group Co Ltd
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Priority to CN201410094113.2A priority Critical patent/CN104912995B/en
Publication of CN104912995A publication Critical patent/CN104912995A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F16F13/14Units of the bushing type, i.e. loaded predominantly radially

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Devices Of Dampers And Springs (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

The invention provides a hydraulic bushing in a vehicle suspension system guide device and a vehicle. The hydraulic bushing comprises an inner tube, a main rubber body coating the outer edge of the inner tube, at least one inner framework which is arranged in the middle of the main rubber body and fixedly connected with the main rubber body, a first flow channel plate, a second flow channel plate, a first liquid chamber, a second liquid chamber and a liquid channel tank. The first flow channel plate and the second flow channel plate are arranged outside the main rubber body. The first liquid chamber is formed between the main rubber body and the first flow channel plate. The second liquid chamber is formed between the main rubber body and the second flow channel plate. The liquid channel tank is arranged between the first liquid chamber and the second liquid chamber and conducts viscous liquid in the first liquid chamber and the second liquid chamber to flow. The first liquid chamber, the second liquid chamber and the liquid channel tank are filled with viscous liquid. The hydraulic bushing is small in occupied space.

Description

Hydraulic bushing and automobile in a kind of guider for automobile suspension system
Technical field
The present invention relates to the hydraulic pressure lining in automobile technical field, more particularly to a kind of guider for automobile suspension system Set and automobile.
Background technology
At present, hydraulic bushing used in the guider of automobile suspension system is generally rubber bushing, fills as being oriented to Put the pin joint that middle control arm or distance rod are connected with vehicle body.Rubber bushing is good with its anti-vibration performance, with desired elasticity The advantages of characteristic and Decay Rate, it has also become indispensable critical elements on automobile.And rubber bushing of the prior art is general For integral rubber bushing, its shortcoming is that dynamic elasticity rigidity is low, angle of lag typically below 10 °, its creep properties and Decay Rate It is poor, it is unfavorable for the rapid decay for vibrating.Therefore, industry has researched and developed hydraulic bushing structure, it is therefore intended that provide big stagnant Relief angle (>=20 °), brings highly attenuating performance, to ensure that car load has good control stability and ride comfort.
The hydraulic bushing applied in automobile suspension system guider has two kinds of basic structural shapes:Axialmode hydraulic pressure Bushing and Radial mode hydraulic bushing.But no matter axialmode or Radial mode hydraulic bushing, the sealing liquid of both mainstay structures Form is all more complicated, is all that outer tube is required for passing through with primary elastomeric body with inner tube by being provided with an outer tube in inner tube fit on Sulfuration is fixed together, larger so as to cause bushing to take up room, and general external diameter will reach more than 80mm, during entire vehicle design herein Need enough spaces just can guarantee that the hydraulic bushing of the lower size of arrangement and without interfering risk.
The content of the invention
Embodiment of the present invention technical problem to be solved is, there is provided it is a kind of take up room it is little for automotive suspension system Hydraulic bushing and automobile in system guider.
In order to solve above-mentioned technical problem, embodiments provide a kind of in automobile suspension system guider Hydraulic bushing, including:
Inner tube;
It is coated on the primary elastomeric body of said inner tube outer rim;
It is arranged at least one inner frame being fixed together in the middle of the primary elastomeric body and with the primary elastomeric body;
It is arranged at the first-class guidance tape and second guidance tape of the external side of the primary elastomeric;
The first liquid room for being formed between the primary elastomeric body and the first-class guidance tape and it is formed at the primary elastomeric body The second liquid room between the second guidance tape;
It is arranged between the first liquid room and the second liquid room and turns on the fluid passage groove of the two;And
The viscous liquid flowed in the first liquid room, the second liquid room and fluid passage groove;
Wherein, two ends of the primary elastomeric body on said inner tube axial direction are formed with the first fitting recess and the second fitting recess; The hydraulic bushing also includes the first rubber body and the second rubber body, and the first rubber body is assemblied in institute After stating in the first fitting recess, the first stiffness equivalent chamber, the second rubber body assembling are formed between the primary elastomeric body After in second fitting recess, the second stiffness equivalent chamber is formed between the primary elastomeric body.
Wherein, the first-class guidance tape and second guidance tape are in the round and smooth centre in both sides towards the one side of the primary elastomeric body The part of convex shape, the corresponding first-class guidance tape of the primary elastomeric body and second guidance tape is in what is caved in towards said inner tube Shape.
Wherein, the diapire of the first liquid room and the second liquid room is plane, and side wall is continuous fluctuating shiny surface and shape Into multiple bends.
Wherein, the hydraulic bushing also includes metal baffle, and it is connected with one end of the first rubber body, and can Close first fitting recess;The second rubber body is arranged on automobile in one end of dorsad the first rubber body It is connected in the plane of control arm or with a metal baffle.
Wherein, on the primary elastomeric body axial direction, the volume in the first stiffness equivalent chamber is adjusted less than second rigidity The volume in whole chamber;And the first rubber body is with the second rubber body with perpendicular to the primary elastomeric body axial direction Central shaft be symmetrical axial symmetry, the length that the first rubber body and the second rubber body phase add is less than described The half of primary elastomeric body axial overall length.
Wherein, the primary elastomeric body is each formed with two boss in first fitting recess and second fitting recess, Described two boss are arranged along said inner tube outer rim in yi word pattern, and with equal radian;The span of the radian exists Between 30 degree to 60 degree.
Wherein, the primary elastomeric body is provided with an at least sealing ring in the first liquid room and the second liquid room side.
Wherein, groove width size of the fluid passage groove on the primary elastomeric body axial direction is in primary elastomeric body radial direction On 3 times of groove depth size.
The embodiment of the present invention also provides a kind of automobile, including described hydraulic bushing.
Implement the embodiment of the present invention, have the advantages that:
Hydraulic bushing sealing liquid form is relatively easy, different from existing hydraulic bushing, eliminates outer tube structure, directly passes through Cooperation of being full of is pressed in outside support the assembly connection completed with vehicle body.And it is larger due to eliminating rigidity using runner plate Outer tube structure, therefore can diametrically reduce the volume of primary elastomeric body, you can reach whole hydraulic bushing for radially The requirement of rigidity, simultaneously because the reduction of hydraulic bushing outside dimension, is just being suitable for design space limited but require possess liquid The automotive suspension of pressure bushing premium properties, can accomplish that diameter is less than 60mm.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, according to These accompanying drawings obtain other accompanying drawings and still fall within scope of the invention.
Fig. 1 is the structural representation of axialmode hydraulic bushing;
Fig. 2 is the structural representation of Radial mode hydraulic bushing;
Fig. 3 is the vertical view for the hydraulic bushing in automobile suspension system guider that the embodiment of the present invention one is provided Figure;
Fig. 4 is the offer of the embodiment of the present invention one for the office at the top of the hydraulic bushing in automobile suspension system guider Portion's structural perspective;
Fig. 5 is the A-A of Fig. 3 to sectional view;
Fig. 6 is the B-B direction sectional view of Fig. 3.
Wherein:1 '-inner tube, 11 '-outer tube, 12 '-nylon ring, 2 '-primary elastomeric body, 3 '-inner frame, 51 '-the first liquid rooms, 52 '-the second liquid rooms, 1- inner tubes, 2- primary elastomeric bodies, 3- inner frames, the first-class guidance tapes of 41-, 42- second guidance tapes, the liquid of 51- first Room, the second liquid of 52- room, 6- fluid passage grooves, the fitting recess of 71- first, the fitting recess of 72- second, 81- the first rubber bodies, 82- Second rubber body, 9- metal baffles, 10- sealing rings, 13- boss.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with accompanying drawing Step ground is described in detail.
Direction and position term that the present invention is previously mentioned, for example " on ", D score, "front", "rear", "left", "right", " interior ", " Outward ", " top ", " bottom ", " side " etc., are only the direction or position of refer to the attached drawing.Therefore, the direction for using and position term It is to illustrate and understand the present invention, rather than limiting the scope of the invention.
Refer to Fig. 1, what inventor had found axialmode hydraulic bushing is structurally characterized in that cavity is designed with vertically two liquid The ' of room 51,52 ', liquid axially flows along hydraulic bushing between the ' of the first liquid room 51 and the ' of the second liquid room 52 when by axial force.Its Operation principle is:When hydraulic bushing is in axial direction subject to low frequency, large amplitude to encourage, larger resistance can be axially being provided Buddhist nun, so as to decay because the uneven excitation of road surface or wheel is delivered to the dynamic force of vehicle body by suspension, reduces body vibrations.
Fig. 2 is refer to, inventor also has found the structure of Radial mode hydraulic bushing just with axialmode conversely, cavity is along footpath Be similarly designed with two ' of liquid room 51,52 ' to circumferencial direction, when by radial force liquid along hydraulic bushing radially in the first liquid room Flow between 51 ' and the ' of the second liquid room 52.Its operation principle is:When hydraulic bushing is subject to low frequency, the large amplitude excitation of radial direction When, big damping vibration attenuation body vibrations can be provided in radial direction.
In order on the basis of the big damping vibration attenuation body vibrations function of hydraulic bushing is retained so that both main flows set The sealing liquid form of meter structure is simpler, and structure takes up room little, inventor provides a kind of new for automobile suspension system Hydraulic bushing in guider, as shown in Figures 3 to 6, in embodiments of the present invention, for automobile suspension system guider In hydraulic bushing, including:
Inner tube 1;
It is coated on the primary elastomeric body 2 of the outer rim of inner tube 1;
It is arranged at least one inner frame 3 being fixed together in the middle of primary elastomeric body 2 and with primary elastomeric body 2;
It is arranged at the first-class guidance tape 41 and second guidance tape 42 in the outside of primary elastomeric body 2;
The first liquid room 51 for being formed between primary elastomeric body 2 and first-class guidance tape 41 and it is formed at primary elastomeric body 2 and second The second liquid room 52 between runner plate 42;
It is arranged between the first liquid room 51 and the second liquid room 52 and turns on the fluid passage groove 6 of the two;And
The viscous liquid of flowing in the first liquid room 51, the second liquid room 52 and fluid passage groove 6.
Further, first-class guidance tape 41 and second guidance tape 42 are in intermediate projections towards the one side of primary elastomeric body 2 Structure, the part of the first-class guidance tape 41 of correspondence of primary elastomeric body 2 and second guidance tape 42 in the shape caved in towards inner tube 1, So that the equal shape in the first liquid room 51 and the second liquid room 52 that first-class guidance tape 41 and second guidance tape 42 are constituted respectively with primary elastomeric body 2 Into there is multiple bends, wherein, the diapire of the first liquid room 51 and the second liquid room 52 is plane, and side wall is continuous fluctuating shiny surface And multiple bends are formed, so as to increase the flow path of the liquid in two liquid rooms, increase the damping of hydraulic bushing.
Further, two ends of the primary elastomeric body 2 on the axial direction of inner tube 1 form respectively the first fitting recess 71 and the second assembling Groove 72, wherein the first fitting recess 71 is located at the top of primary elastomeric body 2, with the first assembling inclined-plane, the second fitting recess 72 is located at master The bottom of rubber bodies 2, similarly, with the second assembling inclined-plane.
Hydraulic bushing also includes the first rubber body 81 and the second rubber body 82.When the first rubber body 81 with When first fitting recess 71 is assembled, the first rubber body 81 can be slipped in the first fitting recess 71 along the first assembling inclined-plane;When first When rubber body 81 needs from the first fitting recess 71 to dismantle, the first rubber body 81 can be skidded off along the first assembling inclined-plane. Due to the setting on the first assembling inclined-plane so that the first rubber body 81 and the first fitting recess 71 are assembled up more easily, conveniently. After first rubber body 81 is assemblied in the first fitting recess 71, it is brought into close contact with the first assembling inclined-plane, the first rubber body The first stiffness equivalent chamber is formed between 81 and primary elastomeric body 2.
When the second rubber body 82 and the second fitting recess 72 are assembled, the second rubber body 82 can be oblique along the second assembling Face is slipped in the second fitting recess 72;When the second rubber body 82 needs from the second fitting recess 72 to dismantle, the second rubber Support body 82 can be skidded off along the second assembling inclined-plane.Because the second assembling inclined-plane also facilitates the second rubber body 82 and the second dress Assembling with groove 72.After second rubber body 82 is assemblied in the second fitting recess 72, it is brought into close contact with the second assembling inclined-plane, the The second stiffness equivalent chamber is formed between two rubber bodies 82 and primary elastomeric body 2.
Above-mentioned first stiffness equivalent chamber and the second stiffness equivalent chamber are filled with air.Therefore, it can by arranging main rubber Colloid 2, the first rubber body 81, the second rubber body 82, the first stiffness equivalent chamber, the second stiffness equivalent chamber and internal skeleton The size of frame 3, freely designs in hydraulic bushing the whole shape for supporting rubber to adjust hydraulic bushing in three direction (axles To, radial direction and torsional direction) ratio of rigidity.
Further, one end of the first rubber body 81 is connected with metal baffle 9, can close the first fitting recess 91, because rubber modulus are less than metal, larger elastic deformation, therefore gold can be produced after the stress of the first rubber body 81 Category baffle plate 9 both plays axial limiting effect to hydraulic bushing, and support loading makes hydraulic bushing uniform force.
Likewise, the second rubber body 82 can be as the first rubber body 81, its dorsad first rubber One end of body 81 can connect a metal baffle (metal baffle 9 one that role is connected with the first rubber body 81 Sample), it is also possible to it is directly installed in the plane of automobile control arm, the effect of control arm plane in such cases is equivalent to baffle plate Effect, power is evenly distributed in the plane that control arm is contacted with hydraulic bushing.
Further, on the axial direction of primary elastomeric body 2, the volume in the first stiffness equivalent chamber is less than the second stiffness equivalent chamber Volume, it is possible to achieve adjustment hydraulic bushing rigidity in the axial direction;On the axial direction of primary elastomeric body 2, the first rubber body 81 with Second rubber body 82 is with the central shaft perpendicular to the axial direction of primary elastomeric body 2 as symmetrical axial symmetry, and the first rubber body 81 The length being added with the second rubber body 82 can similarly realize adjustment less than the half of the axial overall length of primary elastomeric body 2 Hydraulic bushing rigidity in the axial direction.In the same manner, it is also possible to realize adjusting hydraulic bushing diametrically firm by similarity method Degree.
Please in combination with shown in Fig. 3 and Fig. 4, further, primary elastomeric body 2 is in the first fitting recess 71 and the second fitting recess A pair of projections 13 is respectively formed with 72, is arranged along the outer rim of inner tube 1 per a pair of projections 13, the two centerline collineation diametrically, And with equal radian a, rigidity of the hydraulic bushing in torsional direction is adjusted to change torsional direction rigidity.Wherein, radian Span between 30 degree to 60 degree.Incorporated by reference to A-A section view directions and B-B section view directions shown in Fig. 3, upper in Fig. 4 The height difference of the primary elastomeric body 2 in both direction is stated, therefore the first rubber body 81 and the second rubber body 82 are being turned round Turn limiting for the boss 13 that direction can be subject on primary elastomeric body 2.As a example by shown in Fig. 3, radian b is corresponded to for assembling the first rubber First fitting recess 71 of glue supporter 81, the ratio of radian a and radian b is 30:150 to 60:Between 120.In the present embodiment, arc The ratio of degree a and radian b is 45:135.
Further, primary elastomeric body 2 is provided with an at least sealing ring 10 in the first liquid room 51 and the side of the second liquid room 52 It is further ensured that sealing liquid effect.
Further, groove width size of the fluid passage groove 6 on the axial direction of primary elastomeric body 2 be in primary elastomeric body 2 radially 3 times of groove depth size.
Further, primary elastomeric body 2 is fixed together with inner frame 3 by sulfuration process.
The operation principle of hydraulic bushing of the present invention is:Using viscosity or high viscosity liquid is enclosed in rubber bushing, utilize The damping of the damping increase bushing produced when fluid is by runner, there is provided large time delay angle (>=20 °) so that bushing has dynamic elasticity The low and highly attenuating performance of rigidity, it is ensured that car load has good control stability and ride comfort.When hydraulic bushing be subject to P to During load (as shown in Figure 5), viscous liquid (such as ethylene glycol) is by fluid passage groove 6 constantly in the first liquid room 51 and second Back and forth flowing produces damping between liquid room 52, increases attenuation quotient, when needing to strengthen this effect, can enclose higher viscous The liquid of property.
Corresponding to the embodiment of the present invention one for the hydraulic bushing in automobile suspension system guider, the present invention is implemented Example two provides a kind of automobile, with the hydraulic bushing described in the embodiment of the present invention one, the composition and annexation of the hydraulic bushing Deng here is omitted.
Implement the embodiment of the present invention, have the advantages that:
Hydraulic bushing sealing liquid form is relatively easy, different from existing hydraulic bushing, eliminates outer tube structure, directly passes through Cooperation of being full of is pressed in outside support the assembly connection completed with vehicle body.And it is larger due to eliminating rigidity using runner plate Outer tube structure, therefore can diametrically reduce the volume of primary elastomeric body, you can reach whole hydraulic bushing for radially The requirement of rigidity, simultaneously because the reduction of hydraulic bushing outside dimension, is just being suitable for design space limited but require possess liquid The automotive suspension of pressure bushing premium properties, can accomplish that diameter is less than 60mm.
Above disclosed is only a kind of preferred embodiment of the invention, can not limit the power of the present invention with this certainly Sharp scope, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.

Claims (9)

1. the hydraulic bushing in a kind of guider for automobile suspension system, it is characterised in that include:
Inner tube (1);
It is coated on the primary elastomeric body (2) of said inner tube (1) outer rim;
It is arranged at least one inner frame being fixed together in the middle of the primary elastomeric body (2) and with the primary elastomeric body (2) (3);
The first-class guidance tape (41) and second guidance tape (42) being arranged on the outside of the primary elastomeric body (2);
The first liquid room (51) being formed between the primary elastomeric body (2) and the first-class guidance tape (41), and be formed at described The second liquid room (52) between primary elastomeric body (2) and the second guidance tape (42);
It is arranged between the first liquid room (51) and the second liquid room (52) and turns on the fluid passage groove (6) of the two;And
Viscous liquid is filled with the first liquid room (51), the second liquid room (52) and fluid passage groove (6);
Wherein, two ends of the primary elastomeric body (2) on said inner tube (1) axial direction are formed with the first fitting recess (71) and the second dress With groove (72);The hydraulic bushing also includes the first rubber body (81) and the second rubber body (82), described first After rubber body (81) is assemblied in first fitting recess (71), between the primary elastomeric body (2) the first rigidity is formed Adjustment chamber, after the second rubber body (82) is assemblied in second fitting recess (72), with the primary elastomeric body (2) it Between form the second stiffness equivalent chamber.
2. hydraulic bushing as claimed in claim 1, it is characterised in that the first-class guidance tape (41) and second guidance tape (42) One side towards the primary elastomeric body (2) is in intermediate projections shape, and the primary elastomeric body (2) corresponds to the first-class guidance tape (41) With the part of second guidance tape (42) in the shape caved in towards said inner tube (1).
3. hydraulic bushing as claimed in claim 2, it is characterised in that the bottom of the first liquid room (51) and the second liquid room (52) Wall is plane, and side wall is continuous fluctuating shiny surface and forms multiple bends.
4. hydraulic bushing as claimed in claim 1, it is characterised in that the hydraulic bushing also includes metal baffle (9), its with One end of the first rubber body (81) is connected, and closes first fitting recess (71);The second rubber body (82) dorsad one end of the first rubber body (81) be arranged on automobile control arm plane on or with a metal baffle phase Even.
5. hydraulic bushing as claimed in claim 1, it is characterised in that on primary elastomeric body (2) axial direction, described first is firm Volume of the volume in degree adjustment chamber less than the second stiffness equivalent chamber;And the first rubber body (81) and described Two rubber bodies (82) with perpendicular to the primary elastomeric body (2) axial direction central shaft as symmetrical axial symmetry, first rubber The length that supporter (81) is added with the second rubber body (82) is less than the one of primary elastomeric body (2) axial overall length Half.
6. hydraulic bushing as claimed in claim 1, it is characterised in that the primary elastomeric body (2) is in first fitting recess (71) and in second fitting recess (72) two boss (13) are each formed with, described two boss (13) are along said inner tube (1) Outer rim is arranged in yi word pattern, and with equal radian, the span of the radian is between 30 degree to 60 degree.
7. hydraulic bushing as claimed in claim 1, it is characterised in that the primary elastomeric body (2) is in the first liquid room (51) Second liquid room (52) side is provided with an at least sealing ring (10).
8. hydraulic bushing as claimed in claim 1, it is characterised in that the fluid passage groove (6) is in the primary elastomeric body (2) Groove width size on axial direction is 3 times of the groove depth size in the primary elastomeric body (2) radially.
9. a kind of automobile, it is characterised in that include such as the hydraulic bushing described in any one of claim 1 to 8.
CN201410094113.2A 2014-03-14 2014-03-14 Hydraulic bushing in vehicle suspension system guide device and vehicle Active CN104912995B (en)

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CN104912995B true CN104912995B (en) 2017-04-19

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CN108150587A (en) * 2016-12-02 2018-06-12 株洲时代新材料科技股份有限公司 A kind of electrolyte filling method of rail traffic hydraulic bushing
US10563722B2 (en) 2016-12-02 2020-02-18 Zhuzhou Times New Material Technology Co., Ltd. Hydraulic bushing
CN110185735A (en) * 2019-05-17 2019-08-30 株洲时代新材料科技股份有限公司 A kind of liquid composite bush
CN110345193B (en) * 2019-08-30 2024-06-07 株洲时代瑞唯减振装备有限公司 Forming method of liquid rubber composite node with external groove runner and node
CN113669398B (en) * 2020-05-15 2022-09-30 安徽美芝制冷设备有限公司 Foot pad assembly, compressor and refrigerator
CN112537178B (en) * 2020-12-23 2022-08-19 上汽通用汽车有限公司 Automotive suspension bush and automobile

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JP2008025755A (en) * 2006-07-24 2008-02-07 Honda Motor Co Ltd Liquid sealed bushing
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