CN207333554U

CN207333554U - A kind of combined type MR fluid shock absorber

Info

Publication number: CN207333554U
Application number: CN201721412471.9U
Authority: CN
Inventors: 袁显举; 田天宇; 凌宏涛
Original assignee: Hubei University of Automotive Technology
Current assignee: Hubei University of Automotive Technology
Priority date: 2017-10-30
Filing date: 2017-10-30
Publication date: 2018-05-08
Anticipated expiration: 2027-10-30

Abstract

The utility model discloses a kind of combined type MR fluid shock absorber,Including damper body and external valve,Damper body is mainly by outer cylinder,Middle cylinder barrel,Work cylinder barrel,Director assembly,Piston assembly,Piston rod,Bottom valve assembly etc. forms,External valve is mainly by lower Supporting cover,Valve deck,Coil,Every magnetic cylinder,Magnetic conductive cylinder,Circular passage,Spool,Adjusting nut,Upper Supporting cover,Annular magnetic inductive block,Valve seat,Sealing ring and outer mounting base etc. are formed,Wherein triplex structure,Check valve,Topology layout based on external valve causes magnetic flow liquid through external valve one-way flow,Circular passage and radial passage in external valve are all controlled by magnetic field,Damping force regulation and control mainly carry out in circular passage and radial passage,Effective damping passage dramatically increases,Magnetic field utilization rate is higher,Damping force adjustable range is larger,It can implement overload protection under overload and external valve fault condition,Meeting can be in different field broad match under basic rigidity and strength condition,It is versatile.

Description

A kind of combined type MR fluid shock absorber

Technical field

Absorber technical field is the utility model is related to, especially suitable for all kinds of automobile suspension systems, it can also be used to large-scale Machinery, bullet train, bridge, building, weapon system etc., are a kind of larger combined type magnetic flow liquids of damping force adjustable range Damper.

Background technology

Because having, simple in structure, response is rapid, energy consumption is small, controllability is strong, damping adjustable extent is big, continuous damping can be achieved It is adjustable wait remarkable advantage, MR fluid shock absorber be widely used in automotive suspension, heavy duty machine tools, artillery system, bridge, house, The fields such as leviathan, especially field of automobile suspension research with being more widely applied.Traditional MR fluid shock absorber Essentially monotubular and double-barrel structure, portion of techniques scheme increase bypass valve arrangement, but relevant art feature still in piston or The axial passage not with coil face is controlled in by-passing valve, adjustable damping passage is very limited, magnetic field utilization rate is low, can Tune dampening range is greatly limited, damper versatility is poor.It is such as more in order to overcome the limitation of conventional solution The new solution of level Radial Flow and multistage circumferential flow has a certain effect in terms of extremely efficient damp channel, but both So that the volume of damper substantially increases, it is difficult to is arranged in automobile suspension system.

Work hard in view of the above-mentioned problems, some researchers have carried out, it is intended to take into account effective damping passage, magnetic field utilizes Four rate, versatility, volume critical aspects, such as 203257967 U of Chinese patent literature CN describe a kind of screw valve cellular type Magneto-rheological vibration damper, including oil sealing, oil seal seat, guider, end cap, working cylinder, inner cylinder tube, kuppe, piston rod, piston are total The connector being connected into, the magnetic flow liquid inside bottom valve assembly, damper and both ends with suspension system.The structure is in guider Spiral valve opening is set, and coil is arranged in the position for the spiral valve opening for closing on guider, extends the sphere of action in magnetic field, adds resistance The adjustable range of Buddhist nun's power, is arranged easy to more number of turn coils and high current.But the effective damping passage of the structure is still limited, Dampening range is improved by multiturn coil, larger exciting current, compared with high-intensity magnetic field, not yet breaks away from conventional art limitation, effectively resistance The length of Buddhist nun's passage is restricted, it is impossible to and larger damp adjustable range can be produced by only relying on smaller exciting current and low-intensity magnetic field, It can not realize and can be matched by the change of exciting current in different field.

Therefore, prior art not break through relevant art limitation and obvious shortcoming, take into account effective damping passage, Magnetic field utilization rate, versatility, there is an urgent need for new technical solution for four aspects of volume.

The content of the invention

The utility model provides a kind of combined type MR fluid shock absorber dependency structure and principle, can realize effective damping The length and damp adjustable range of passage substantially increase, low-intensity magnetic field can produce larger damping force, can be by current regulation Different field broad match, damper volume are without obvious increase.In preferable scheme, when magnetic flow liquid viscosity control device goes out During existing failure, damper can work according to Passive Mode, it is ensured that security.

In order to solve the above-mentioned technical problem, technical solution is used by the utility model：

A kind of combined type MR fluid shock absorber, including damper body and the external valve on damper body, Damper body is mainly by outer cylinder, middle cylinder barrel, work cylinder barrel, director assembly, piston assembly, piston rod and bottom valve assembly Composition, the work cylinder barrel is interior to be equipped with piston assembly, and piston-rod lower end is connected by screw thread with piston assembly, piston assembly and work To make to be equipped with sealing device between cylinder barrel and be slidably matched, piston rod is slidably matched with the director assembly being located at the top of work cylinder barrel, Bottom valve assembly is installed with the lower end port of work cylinder barrel, the bottom of bottom valve assembly is connected with the bottom cavity in outer cylinder It is logical, it is respectively equipped with check valve in piston assembly and bottom valve assembly；

The outer cylinder upper end is fitted with installation sleeve and is connected as a single entity, and middle cylinder barrel and work cylinder barrel are installed on outer cylinder Interior, the upper end of middle cylinder barrel and work cylinder barrel and the installation sleeve being located on outer cylinder and director assembly pass through damper gland Realization is coaxially positioned with outer cylinder, and the downside of middle cylinder barrel is fixedly connected with the valve seat bottom of external valve, the both ends of middle cylinder barrel Sealing device is equipped with the connecting portion of work cylinder barrel；The space that the outer wall of the inner wall of outer cylinder and middle cylinder barrel is formed is oil storage The space that chamber, the inner wall of middle cylinder barrel and the outer wall of work cylinder barrel are formed is intermediate cavity, and work cylinder barrel inner space is working chamber, Working chamber is divided into recovery chamber and compression chamber by piston assembly, is equipped with the first normal open hole between recovery chamber and intermediate cavity, shoe cream room, Magnetic flow liquid is added in recovery chamber and compression chamber in intermediate cavity, working chamber；

The external valve include lower Supporting cover, valve deck, coil, every magnetic cylinder, magnetic conductive cylinder, circular passage, spool, adjust spiral shell Female, upper Supporting cover, annular magnetic inductive block, valve seat, sealing ring and outer mounting base, the valve seat bottom of external valve are stretched on middle cylinder barrel In connecting interface, valve seat bottom is concordant with the inner wall of middle cylinder barrel, with the coaxial mounted spool of valve seat by connecting interface with Between chamber communicate, the magnetic flow liquid in intermediate cavity by external valve carry out one-way flow；

The lower end outer wall of valve seat forms the second cavity with outer mounting base, and the second cavity is communicated with shoe cream room, in external valve Magnetic flow liquid enters the second cavity by the radial direction oil return hole on valve seat, is unidirectionally back to shoe cream room；

The center of spool is machined with axial normal open hole, and the other end of spool is equipped with radial direction normal open hole, the wall coaxial of spool It is logical to be set with adjusting nut, upper Supporting cover, level-one annular magnetic inductive block, level-one circular passage, two level annular magnetic inductive block, two level annular Road；

The adjusting nut, upper Supporting cover, level-one annular magnetic inductive block, level-one circular passage, two level annular magnetic inductive block, two level The wall coaxial of circular passage is provided with every magnetic cylinder and magnetic conductive cylinder, every outside magnetic cylinder and the outer wall suit coil of magnetic conductive cylinder, coil Wall is contacted and positioned with the inner wall of valve deck, valve seat；

The level-one annular magnetic inductive block and two level annular magnetic inductive block are respectively equipped with the first perforation normal open hole and the second perforation is normal Through hole, the upper and lower end face of level-one circular passage are machined with first end face normal open hole and second end face normal open hole, two level annular respectively The upper and lower end face of passage is machined with the 3rd end face normal open hole and the 4th end face normal open hole, level-one annular magnetic inductive block and basin shape respectively The space that forms of upper Supporting cover be the first cavity, the space that the lower face of two level circular passage is formed with valve seat is radially leads to Road, radial passage are communicated with the second cavity；

The first perforation normal open hole is alignd and is communicated with first end face normal open hole, second end face normal open hole and the second perforation Normal open hole is alignd and is communicated, and the second perforation normal open hole is alignd and communicated with the 3rd end face normal open hole, the 4th end face normal open hole and footpath Communicated to passage；It is equal so as to form whole girth, the radical length of radial passage of level-one circular passage and two level circular passage For effective damping length.

Preferably, in external valve, the upper and lower wall of level-one circular passage and two level circular passage uses permeability magnetic material, The inside and outside wall of level-one circular passage and two level circular passage uses magnetic separator；Level-one annular magnetic inductive block, two level annular magnetic conduction Block, magnetic conductive cylinder, valve deck, valve seat use permeability magnetic material, and spool, upper Supporting cover, every magnetic cylinder use magnetic separator.

Preferably, the both ends of the middle cylinder barrel use undergauge structure, the first sealing ring and the second sealing is respectively adopted Circle realizes the sealing with work cylinder barrel relevant position.

Preferably, the check valve arranged in the piston assembly is flowing valve and stretching valve, installed on bottom valve assembly Check valve is recuperation valve and compression valve, and flowing valve and recuperation valve are formed by stacking by relatively thin few piece circular ring shape valve block, stretching valve and Compression valve is formed by stacking by thicker multi-disc circular ring shape valve block.

The operation principle of preferred one-way valve：

Normal restoration stage, piston assembly uplink, flowing valve, stretching valve, compression valve are in normal closed mode, and recuperation valve holds Easily open, the magnetic flow liquid in recovery chamber enters intermediate cavity by the first normal open hole of work cylinder barrel upper end, converges via external valve To shoe cream room, the magnetic flow liquid in shoe cream room passes through compensation valve compensation to compression chamber；

Normal compression stage, piston assembly downlink, stretching valve, recuperation valve, compression valve are in normal closed mode, and flowing valve is opened Open, the magnetic flow liquid in compression chamber enters recovery chamber by flowing valve, and the magnetic flow liquid in recovery chamber is by work cylinder barrel upper end The first normal open hole enter intermediate cavity, converge into shoe cream room via external valve；

Normal compression and recovery phase, magnetic flow liquid flow by external valve one-way circulation and implement viscosity control, real The regulation and control of existing damping force；Under extreme working position, stretch valve and compression valve and implement overload protection, it is appropriate to open, damper according to Passive Mode works, it is ensured that security.

Operation principle of the magnetic flow liquid in external valve：

In external valve, the flow path for coming from the magnetic flow liquid of intermediate cavity is followed successively by axial normal open hole, radial direction normal open Hole, the first cavity, the first perforation normal open hole, first end face normal open hole, level-one circular passage, second end face normal open hole, second are passed through Usual through hole, the 3rd end face normal open hole, two level circular passage, the 4th end face normal open hole, radial passage, the second cavity, are back to Shoe cream room；

In external valve, come from first end face normal open hole magnetic flow liquid enter level-one circular passage after, split into two Part, after each several part makees circumferential flow, converge into second end face normal open hole, the second perforation normal open hole, the 3rd end face normal open hole into Enter two level circular passage, split into two parts again, after each several part makees circumferential flow, converge into the 4th end face normal open hole, pass through The Radial Flow of radial passage enters the second cavity, is back to shoe cream room；

In external valve, the whole girth of level-one circular passage and two level circular passage is effective damping length, controllable Damp channel greatly increases；The radical length of radial passage is effective controllable damping length, further increases damping effect；

Level-one circular passage in the external valve, two level circular passage, radial passage are effective controllable damping passage, palpus Realize that the magnetic line of force passes perpendicularly through the magnetic current in level-one circular passage, two level circular passage, radial passage along whole circumferential direction The circumferential flow direction of change liquid, level-one circular passage and the magnetic flow liquid in two level circular passage is vertical with the magnetic line of force, radially logical The radial flow direction of magnetic flow liquid in road is vertical with the magnetic line of force；

In external valve, magnetic field path is successively by radial passage, two level circular passage, two level annular magnetic inductive block, level-one ring Shape passage, level-one annular magnetic inductive block, magnetic conductive cylinder, valve deck, valve seat form closed circuit, and most magnetic lines of force are annular through level-one Magnetic flow liquid in passage, two level circular passage, radial passage.

Structure and principle more than, a kind of combined type MR fluid shock absorber provided by the utility model have Following beneficial effect：

1st, the utility model proposes a kind of MR fluid shock absorber technical solution for being totally different from existing structure, use Topology layout based on triplex structure and external valve, forms magnetic flow liquid one-way flow, and damping force mainly carries out in external valve Control；Effective damping passage is all controlled by magnetic field, magnetic field utilization rate is higher, damping force adjustable range is larger, energy consumption is relatively low；Outside Put simple valve arrangement, small volume, cost is relatively low, extension is easy, the security after failure can obtain abundant guarantee.

2nd, damper body corresponding construction, material and common oil damper are basically identical, only adds additional in one Between cylinder barrel, extra diameter will not be significantly increased, be easily installed in narrow locus, also reduce production magnetic flow liquid subtract Shake the cost of device, simplify the technological process of exploitation new type vibration isolator.

3rd, external valve arrangement is compact, component number is few and is conventional machining parts, small, easy to maintain, raw Production is low with use cost, and extension and adjustment damping are easy, only turns on adjusting nut, increase or reduction circular passage number, again New fastening, can realize differentiation configuration and different field broad match in same field.

4th, magnetic field utilization rate is higher, and low-intensity magnetic field can produce larger damping force, and adjustable extent is larger, using coil turn Less, exciting current is smaller, energy consumption is low, caloric value is smaller.

5th, external valve flexible arrangement, is easily installed in the relatively low position of damper body, and increased micro volume will not be by Arrangement to automobile chassis limits.

6th, by the way of the control damping of external valve, avoid and arrange magnetic field in piston assembly small space, easy to line The arrangement of circle and conducting wire, beneficial to heat dissipation.

7th, due to longer controllable damping passage, adjustable extent is larger, adjusts by different exciting currents and can be achieved Different damping force ranges, which can be in different field in the case where meeting fundamental strength and rigidity condition Using versatility is stronger.

8th, when external valve is entirely ineffective, block when failure when, which can be according to the passive vibration damping of tradition The mode of device works, and shows hard damping characteristic, ensures vehicle safety.

Brief description of the drawings

Fig. 1 is overall structure diagram.

Fig. 2 is that overall structure master cuts open schematic diagram.

Fig. 3 is that the master of external valve 12 cuts open structure enlargement diagram.

Fig. 4 is the close-up schematic view of guiding assemblage 6 in Fig. 2.

Fig. 5 is the close-up schematic view of piston assembly 7 in Fig. 2.

Fig. 6 is the close-up schematic view of bottom valve assembly 9 in Fig. 2.

Fig. 7 is magnetic line of force path schematic diagram in external valve 12.

Fig. 8 is that magnetic flow liquid flows path schematic diagram when damper is in compression travel.

Fig. 9 is the M partial enlarged views in Fig. 8.

Figure 10 is that damper is in magnetic flow liquid flowing path schematic diagram when restoring stroke.

Figure 11 is the N partial enlarged views in Figure 10.

Shown in figure：Damper body (A), outer cylinder (1), middle cylinder barrel (2), connecting interface (2a), work cylinder barrel (3), the first normal open hole (3a), the first sealing ring (4-1), the second sealing ring (4-2), installation sleeve (5), director assembly (6), Damper gland (6-1), dust cover (6-2), oil sealing (6-3), the 3rd sealing ring (6-4), this spy's envelope (6-5), guider (6- 6), pilot bushing (6-7), piston assembly (7), limit base (7-1), circulation valve leaf (7-2), flowing valve (7-3), piston valve base (7-4), stretching valve (7-5), spring base (7-6), sealing guide ring (7-7), the 4th sealing ring (7-8), guide sleeve (7-9), first Spring (7-10), nut (7-11), piston rod (8), bottom valve assembly (9), rivet (9-1), second spring (9-2), recuperation valve (9- 3), compression valve seat (9-4), compression valve (9-5), lifting lug (10), bracket bush (11), external valve (12), lower Supporting cover (12-1), Valve deck (12-2), coil (12-3), every magnetic cylinder (12-4), magnetic conductive cylinder (12-5), circular passage (12-6), level-one circular passage (12-61), first end face normal open hole (12-61a), second end face normal open hole (12-61b), two level circular passage (12-62), the Three end faces normal open hole (12-62a), the 4th end face normal open hole (12-62b), spool (12-7), axial normal open hole (12-7a), radially Normal open hole (12-7b), first boss (12-7c), adjusting nut (12-8), upper Supporting cover (12-9), annular magnetic inductive block (12- 10), level-one annular magnetic inductive block (12-101), the first perforation normal open hole (12-101a), two level annular magnetic inductive block (12-102), the Two perforations normal open hole (12-102a), valve seat (12-11), radial direction oil return hole (12-11a), boss annular groove (12-11b), second is convex Platform (12-11c), the 5th sealing ring (12-12), outer mounting base (12-13), the second cavity (12-13a), radial passage (12- 14), the first cavity (12-15), the 6th sealing ring (12-16), shoe cream room (X), intermediate cavity (Y), working chamber (Z), recovery chamber (Z- 1), compression chamber (Z-2).

Embodiment

As shown in Figure 1, 2, 3, a kind of combined type MR fluid shock absorber, including damper body A and external valve 12, vibration damping Device body A is mainly by outer cylinder 1, middle cylinder barrel 2, work cylinder barrel 3, the first sealing ring 4-1, the second sealing ring 4-2, installation sleeve 5th, director assembly 6, piston assembly 7, piston rod 8, bottom valve assembly 9, lifting lug 10, bracket bush 11 form, and external valve 12 includes Lower Supporting cover 12-1, valve deck 12-2, coil 12-3, every magnetic cylinder 12-4, magnetic conductive cylinder 12-5, circular passage 12-6, spool 12-7, adjust Save nut 12-8, upper Supporting cover 12-9, annular magnetic inductive block 12-10, valve seat 12-11, the 5th sealing ring 12-12, outer mounting base 12- 13。

Middle cylinder barrel 2 and work cylinder barrel 3 are coaxially installed in outer cylinder 1, and the inner wall of outer cylinder 1 is outer with middle cylinder barrel 2 The space that wall is formed be shoe cream room X, and the space of the inner wall of middle cylinder barrel 2 and the outer wall formation of work cylinder barrel 3 is intermediate cavity Y, work It is working chamber Z to make 3 inner space of cylinder barrel, and working chamber Z is divided into recovery chamber Z-1 and compression chamber Z-2, shoe cream room by piston assembly 7 X, magnetic flow liquid is added in the recovery chamber Z-1 and compression chamber Z-2 in intermediate cavity Y, working chamber Z.

Middle 2 both ends of cylinder barrel use undergauge structure, be respectively adopted the first sealing ring 4-1 and the second sealing ring 4-2 realize with The sealing function of 3 relevant position of work cylinder barrel, avoids magnetic flow liquid from leaking to shoe cream room X by intermediate cavity Y.

Work cylinder barrel 3 realizes coaxial positioning, damper gland by installation sleeve 5 and director assembly 6 with outer cylinder 1 6-1 and installation sleeve 5 carry out screw thread socket, the damper gland 6-1 installation sleeve 5, director assembly 6 are carried out positioning with Fastening.

The lower end of piston rod 8 is fixedly connected by screw thread with piston assembly 7, and upper end and the director assembly 6 of piston rod 8 are slided Move and coordinate and ensure the axial movement of piston rod 8, flowing valve 7-3 and stretching valve 7-5 are integrated in piston assembly 7, bottom valve assembly 9 The bottom of outer cylinder 1 and the bottom space of work cylinder barrel 3 are installed on, the bottom outer surface of outer cylinder 1 is equipped with and suspension system Connector lifting lug 10 and bracket bush 11.

External valve 12 is overall to be coaxially installed in outer mounting base 12-13, and outer mounting base 12-13 is welded in 1 lower end of outer cylinder The outer surface of position, the binding site interference fit of outer mounting base 12-13 and valve deck 12-2, valve seat 12-11 in external valve 12 are real The radial positioning of existing external valve 12 and fastening, install the 5th sealing ring 12-12 additional between outer mounting base 12-13 and valve seat 12-11.

The bottom of valve seat 12-11 in external valve 12 passes through outer cylinder 1, is stretched by the connecting interface 2a on middle cylinder barrel 2 Enter to intermediate cavity Y, realize that external valve 12 is connected with intermediate cavity Y, carried out easy to the magnetic flow liquid in intermediate cavity Y by external valve 12 One-way flow；The apical position of connecting interface 2a is spacing to valve seat 12-11 progress, ensures that the bottom entrance of valve seat 12-11 stretches into To the position concordant with intermediate cavity Y inner surfaces.

Install the 6th sealing ring 12-16, valve seat between the bottom outer surface of valve seat 12-11 and the inner wall of connecting interface 2a additional The second cavity 12-13a, the second cavity are formed between the lower end inner surface of the lower end outer surface of 12-11 and outer mounting base 12-13 12-13a is connected with shoe cream room X, easy to the magnetic flow liquid in external valve 12 by the radial direction oil return hole 12-11a on valve seat 12-11 The second cavity 12-13a is entered, is unidirectionally back to shoe cream room X.

As shown in Fig. 2,3,6, valve seat 12-11 is the matrix of external valve 12, and spool 12-7 is coaxially installed on valve seat 12-11 It is interior, lower Supporting cover 12-1, upper Supporting cover 12-9, valve seat 12-11 to spool 12-7 carry out axially position, the lower end of spool 12-7 with The interference fit of valve seat 12-11 inner walls avoids magnetic flow liquid from directly leaking to shoe cream room X.

The center of spool 12-7 is machined with axial normal open hole 12-7a, and the other end of spool is equipped with radial direction normal open hole 12-7b, Adjusting nut 12-8, upper Supporting cover 12-9, level-one annular magnetic inductive block 12-101, level-one circular passage 12-61, two level annular magnetic conduction In the outer wall of spool 12-7, it is radially fixed to be carried out by spool 12-7 for block 12-102, the equal coaxial packages of two level circular passage 12-62 Position.

The second boss 12-11c in first boss 12-7c and valve seat 12-11 on spool 12-7 is two level circular passage The axial support zone of 12-62, installs two level annular magnetic inductive block 12-102, level-one annular on the 12-62 of two level circular passage additional successively Passage 12-61, the bottom plane of level-one annular magnetic inductive block 12-101, upper Supporting cover 12-9 are with level-one annular magnetic inductive block 12-101's Upper surface contacts, and upper Supporting cover 12-9, first boss 12-7c, second boss 12-11c are jointly to level-one annular magnetic inductive block 12- 101st, level-one circular passage 12-61, two level annular magnetic inductive block 12-102, two level circular passage 12-62 carry out axially position and tight Gu.

Level-one annular magnetic inductive block 12-101, level-one circular passage 12-61, two level annular magnetic inductive block 12-102, two level annular The wall coaxial of passage 12-62 is provided with every magnetic cylinder 12-4 and magnetic conductive cylinder 12-5, every magnetic cylinder 12-4 and the outer wall of magnetic conductive cylinder 12-5 Coaxial package coil 12-3, coil 12-3 are contacted and positioned with the inner wall of valve deck 12-2, valve seat 12-11.

Level-one annular magnetic inductive block 12-101 and two level annular magnetic inductive block 12-102 are respectively equipped with the first perforation normal open hole 12- It is normal that the upper and lower end face of the perforations of 101a and second normal open hole 12-102a, level-one circular passage 12-61 are machined with first end face respectively Through hole 12-61a and second end face normal open hole 12-61b, the upper and lower end face of two level circular passage 12-62 are machined with the 3rd end respectively Face normal open hole 12-62a and the 4th end face normal open hole 12-62b, level-one annular magnetic inductive block 12-101 and the upper Supporting cover 12-9 of basin shape The space of composition is the first cavity 12-15, and lower face and the valve seat 12-11 spaces formed of two level circular passage 12-62 are footpath To passage 12-14, radial passage 12-14 is communicated with the second cavity 12-13a.

First perforation normal open hole 12-101a aligns and communicates with first end face normal open hole 12-61a, second end face normal open hole 12-61b aligns and communicates with the second perforation normal open hole 12-102a, the second perforation normal open hole 12-102a and the 3rd end face normal open Hole 12-62a aligns and communicates, and the 4th end face normal open hole 12-62b is communicated with radial passage 12-14.

Every the upper and lower surfaces of magnetic cylinder 12-4 by the way of low-temperature welding respectively with boss annular groove 12-11b and magnetic conductive cylinder 12-5 Realize connection, the upper end outer surface of magnetic conductive cylinder 12-5 is contacted with the inner wall of valve deck 12-11, and the upper end inner surface of magnetic conductive cylinder 12-5 leads to Cross screw thread to be connected with adjusting nut 12-8, the inner cavity of adjusting nut 12-8 contacts simultaneously with spool 12-7 tops and upper Supporting cover 12-9 Implement axially position and fastening, valve deck 12-2 and valve seat 12-11 is realized in contact position and is interference fitted.

Valve deck 12-2 and adjusting nut 12-8 is used for axially position and the fastening of whole external valve 12, and adjusting nut 12-8 can Manufacture and the rigging error of external valve 12 are made up, also allows for adjusting component number, realizes that differentiation configuration and different field should With.

As shown in Figure 2,4, dust cover 6-2, oil sealing 6-3, the 3rd sealing ring 6-4, this spy's envelope 6- are equipped with director assembly 6 5th, guider 6-6, pilot bushing 6-7, the tip portion of guider 6-6 from work cylinder barrel 3 are stretched into work cylinder barrel 3, working cylinder 3 highest planes of cylinder are spacing to guider 6-6 progress, and the lower end inner wall of guider 6-6 is coaxially installed with pilot bushing 6-7, is oriented to The 3rd sealing ring 6-4 of installation between the outer wall and installation sleeve 5 of device 6-6, the piston rod 8 and oil sealing 6-3 in director assembly 6, Si Te envelopes 6-5, guider 6-6, pilot bushing 6-7 etc. are more to be partly slidably matched and ensures the axial movement of piston rod 8, as far as possible Prevent magnetic flow liquid from revealing.

As shown in Fig. 2,5,6, piston assembly 7 is equipped with flowing valve 7-3 and stretching valve 7-5, and bottom valve assembly 9 is provided with compensation Valve 9-3 and compression valve 9-5, flowing valve 7-3, stretching valve 7-5, recuperation valve 9-3, compression valve 9-5 are check valve, flowing valve 7-3 It is formed by stacking with recuperation valve 9-3 by relatively thin few piece circular ring shape valve block, stretching valve 7-5 and compression valve 9-5 is justified by thicker multi-disc Annular valve block is formed by stacking.

Normal restoration stage, 7 uplink of piston assembly, flowing valve 7-3, stretching valve 7-5, compression valve 9-5 are in and often close shape State, the magnetic flow liquid in recovery chamber Z-1 enters intermediate cavity Y by the first normal open hole 3a of 3 upper end of work cylinder barrel, via external valve 12 Converge into shoe cream room X；

Magnetic flow liquid in recovery chamber Z-1 and compression chamber Z-2 does not circulate directly, the magnetic flow liquid pressure in shoe cream room X with After the difference of magnetic flow liquid pressure in compression chamber Z-2 reaches recuperation valve 9-3 unlatching critical pressure differentials, recuperation valve 9-3 is suitably opened, Magnetic flow liquid in shoe cream room X is compensated to compression chamber Z-2 by recuperation valve 9-3, makes up in compression chamber Z-2 magnetic flow liquid volume not Foot；

Normal compression stage, 7 downlink of piston assembly, stretching valve 7-5, recuperation valve 9-3, compression valve 9-5, which are in, often closes shape State, flowing valve 7-3 are opened, and the magnetic flow liquid in compression chamber Z-2 enters directly into recovery chamber Z-1, recovery chamber by flowing valve 7-3 Magnetic flow liquid in Z-1 enters intermediate cavity Y by the first normal open hole 3a of 3 upper end of work cylinder barrel, and storage is converged into via external valve 12 Oil pocket X；

Normal compression and recovery phase, magnetic flow liquid flow by external 12 one-way circulation of valve and implement viscosity control, Realize the regulation and control of damping force；

When magnetic flow liquid flowing in external valve 12 is more difficult, the external valve 12 of recuperation, intermediate cavity Y, recovery chamber Magnetic flow liquid pressure in Z-1 is very high, and the magnetic flow liquid pressure differential value in recovery chamber Z-1 and compression chamber Z-2 forces recuperation valve 9-3 Micro aperture is opened, hard damping characteristic is presented, avoids external valve 12 from blocking, damage, exciting current is excessively high causes system destruction, Guarantee driving safety；It is the external valve 12 of compression process, intermediate cavity Y, multiple when magnetic flow liquid flowing in external valve 12 is more difficult Magnetic flow liquid pressure in former chamber Z-1 is very high, and flowing valve 7-3 apertures are greatly suppressed, and compression valve 9-5 opens micro aperture, Magnetic flow liquid aerial drainage in compression chamber Z-2 ensures that piston assembly has certain locomitivity, avoids system destruction to shoe cream room X；

Under limiting condition, stretching valve 7-5 and recuperation valve 9-3 is forced to open, and damper body A returns to passive damper work Operation mode, combined type MR fluid shock absorber are in the active control pattern of external valve 12 and the Passive Mode of damper body A The state worked at the same time, avoids excessive damping force, too small piston assembly stroke, implements overload protection.

As shown in Fig. 2,3,7, the path in magnetic field is as shown by arrows successively by radial passage 12-14, two level circular passage 12- 62nd, two level annular magnetic inductive block 12-102, level-one circular passage 12-61, level-one annular magnetic inductive block 12-101, magnetic conductive cylinder 12-5, valve Cover 12-2, valve seat 12-11 and form closed circuit, most magnetic lines of force all pass perpendicularly through level-one circular passage 12-61, two level Magnetic flow liquid in circular passage 12-62, radial passage 12-14, level-one circular passage 12-61 and two level circular passage 12-62 The circumferential flow direction of interior magnetic flow liquid is vertical with the magnetic line of force, the magnetic flow liquid radial flow direction in the 12-14 of radial passage It is vertical with the magnetic line of force.

The upper and lower wall of level-one circular passage 12-61 and two level circular passage 12-62 use permeability magnetic material, and level-one annular is logical The inside and outside wall of road 12-61 and two level circular passage 12-62 use magnetic separator, level-one annular magnetic inductive block 12-101, two level annular Magnetic inductive block 12-102, magnetic conductive cylinder 12-5, valve deck 12-2, valve seat 12-11 use permeability magnetic material, spool 12-7, upper Supporting cover 12-9, Magnetic separator is used every magnetic cylinder 12-4.

As shown in arrow in Fig. 2,3,8,9, normal compression stage, 7 downlink of piston assembly, stretching valve 7-5, recuperation valve 9-3, Compression valve 9-5 is in normal closed mode, and flowing valve 7-3 is opened, and the magnetic flow liquid in compression chamber Z-2 enters multiple through flowing valve 7-3 Magnetic flow liquid in former chamber Z-1, in recovery chamber Z-1 is normal via the first normal open hole 3a, intermediate cavity Y, connecting interface 2a, axial direction successively Through hole 12-7a, radial direction normal open hole 12-7b, the first cavity 12-15, the first perforation normal open hole 12-101a, first end face normal open hole 12-61a, level-one circular passage 12-61, second end face normal open hole 12-61b, the second perforation normal open hole 12-102a, the 3rd end face Normal open hole 12-62a, two level circular passage 12-62, the 4th end face normal open hole 12-62b, radial passage 12-14, the second cavity 12- 13a, is back to shoe cream room X.

As shown in arrow in Fig. 2,3,10,11, the normal restoration stage, 7 uplink of piston assembly, flowing valve 7-3, stretching valve 7- 5th, compression valve 9-5 is in normal closed mode, and recuperation valve 9-3 is easily opened, and the magnetic flow liquid in recovery chamber Z-1 passes through first successively Normal open hole 3a, intermediate cavity Y, connecting interface 2a, axial normal open hole 12-7a, radial direction normal open hole 12-7b, the first cavity 12-15, the Consistent usually through hole 12-101a, first end face normal open hole 12-61a, level-one circular passage 12-61, second end face normal open hole 12- 61b, the second perforation normal open hole 12-102a, the 3rd end face normal open hole 12-62a, two level circular passage 12-62, the 4th end face normal open Hole 12-62b, radial passage 12-14, the second cavity 12-13a, are back to shoe cream room X.

When magnetic flow liquid pressure in shoe cream room X is more than the magnetic flow liquid pressure in compression chamber Z-2, recuperation valve 9-3 is opened, Magnetic flow liquid in shoe cream room X is compensated into compression chamber Z-2 by recuperation valve 9-3, is made up compression chamber Z-2 inner volumes deficiency, is kept away Exempt from idle running phenomenon.

As shown in Fig. 3,8,9,10,11, no matter compress or recovery phase, magnetic flow liquid are unidirectionally flowed by external valve 12 It is dynamic, come from first end face normal open hole 12-61a magnetic flow liquid enter level-one circular passage 12-61 after, split into two parts, After each several part makees circumferential flow, second end face normal open hole 12-61b, the second perforation normal open hole 12-102a, the 3rd end face are converged into Normal open hole 12-62a enters two level circular passage 12-62, splits into two parts again, after each several part makees circumferential flow, converges into 4th end face normal open hole 12-62b, enters the second cavity 12-13a by the Radial Flow of radial passage 12-14, is back to oil storage Chamber X.

The whole girth of level-one circular passage 12-61 and two level circular passage 12-62 are effective damping length, controllable resistance Buddhist nun's passage greatly increases；The radical length of radial passage 12-14 is effective controllable damping length, further increase damping effect Should.

Claims

A kind of 1. combined type MR fluid shock absorber, it is characterised in that：Including damper body (A) and installed in damper body (A) the external valve (12) on,

Damper body (A) is mainly total by outer cylinder (1), middle cylinder barrel (2), work cylinder barrel (3), director assembly (6), piston Formed into (7), piston rod (8) and bottom valve assembly (9), be equipped with piston assembly (7) in the work cylinder barrel (3), under piston rod (8) End is connected by screw thread with piston assembly (7), and sealing device is equipped between piston assembly (7) and work cylinder barrel (3) and is slidably matched, Piston rod (8) is slidably matched with the director assembly (6) being located at the top of work cylinder barrel (3), at the lower end port of work cylinder barrel (3) Bottom valve assembly (9) is installed with, the bottom of bottom valve assembly (9) is connected with the bottom cavity in outer cylinder (1), piston assembly (7) and in bottom valve assembly (9) it is respectively equipped with check valve；

Outer cylinder (1) upper end is fitted with installation sleeve (5) and is connected as a single entity, middle cylinder barrel (2) and work cylinder barrel (3) installation In the outer cylinder (1), the upper end of middle cylinder barrel (2) and work cylinder barrel (3) and the installation sleeve (5) that is located on outer cylinder (1) and Director assembly (6) by damper gland (6-1) realize with the coaxial positioning of outer cylinder (1), the downside of middle cylinder barrel (2) and outside Valve seat (12-11) bottom for putting valve (12) is fixedly connected, and the both ends of middle cylinder barrel (2) and the connecting portion of work cylinder barrel (3) are equipped with Sealing device；The space that the inner wall of outer cylinder (1) and the outer wall of middle cylinder barrel (2) are formed is shoe cream room (X), middle cylinder barrel (2) The space that is formed of outer wall of inner wall and work cylinder barrel (3) be intermediate cavity (Y), work cylinder barrel (3) inner space is working chamber (Z), working chamber (Z) is divided into recovery chamber (Z-1) and compression chamber (Z-2), recovery chamber (Z-1) and intermediate cavity by piston assembly (7) (Y) it is equipped with the first normal open hole (3a) between, recovery chamber (Z-1) and compression in shoe cream room (X), intermediate cavity (Y), working chamber (Z) Magnetic flow liquid is added in chamber (Z-2)；

The external valve (12) include lower Supporting cover (12-1), valve deck (12-2), coil (12-3), every magnetic cylinder (12-4), magnetic conduction Cylinder (12-5), circular passage (12-6), spool (12-7), adjusting nut (12-8), upper Supporting cover (12-9), annular magnetic inductive block (12-10), valve seat (12-11), the 5th sealing ring (12-12) and outer mounting base (12-13), the valve seat (12- of external valve (12) 11) bottom is stretched into the connecting interface (2a) on middle cylinder barrel (2), and valve seat (12-11) bottom and the inner wall of middle cylinder barrel (2) are put down Together, communicated with valve seat (12-11) coaxial mounted spool (12-7) by connecting interface (2a) with intermediate cavity (Y), intermediate cavity (Y) In magnetic flow liquid by external valve (12) carry out one-way flow；

The lower end outer wall of valve seat (12-11) forms the second cavity (12-13a), the second cavity (12- with outer mounting base (12-13) 13a) communicated with shoe cream room (X), the magnetic flow liquid in external valve (12) is by the radial direction oil return hole (12- on valve seat (12-11) The second cavity (12-13a) 11a) is entered, is unidirectionally back to shoe cream room (X)；

The center of spool (12-7) is machined with axial normal open hole (12-7a), and the other end of spool is equipped with radial direction normal open hole (12- 7b), the wall coaxial of spool (12-7) is set with adjusting nut (12-8), upper Supporting cover (12-9), level-one annular magnetic inductive block (12-101), level-one circular passage (12-61), two level annular magnetic inductive block (12-102), two level circular passage (12-62)；

The adjusting nut (12-8), upper Supporting cover (12-9), level-one annular magnetic inductive block (12-101), level-one circular passage (12- 61), two level annular magnetic inductive block (12-102), the wall coaxial of two level circular passage (12-62) be provided with every magnetic cylinder (12-4) and Magnetic conductive cylinder (12-5), every magnetic cylinder (12-4) and the outer wall suit coil (12-3) of magnetic conductive cylinder (12-5), the outer wall of coil (12-3) Contact and position with the inner wall of valve deck (12-2), valve seat (12-11)；

The level-one annular magnetic inductive block (12-101) and two level annular magnetic inductive block (12-102) are respectively equipped with the first perforation normal open hole (12-101a) and the second perforation normal open hole (12-102a), the upper and lower end face of level-one circular passage (12-61) are machined with the respectively End face normal open hole (12-61a) and second end face normal open hole (12-61b), the upper and lower end face point of two level circular passage (12-62) The 3rd end face normal open hole (12-62a) and the 4th end face normal open hole (12-62b), level-one annular magnetic inductive block (12-101) are not machined with The space formed with the upper Supporting cover (12-9) of basin shape is the first cavity (12-15), the lower face of two level circular passage (12-62) The space formed with valve seat (12-11) is radial passage (12-14), radial passage (12-14) and the second cavity (12-13a) phase It is logical；

First perforation normal open hole (12-101a) is alignd and is communicated with first end face normal open hole (12-61a), and second end face is normal Through hole (12-61b) align and communicates with the second perforation normal open hole (12-102a), the second perforation normal open hole (12-102a) and the Three end faces normal open hole (12-62a) are alignd and are communicated, and the 4th end face normal open hole (12-62b) is communicated with radial passage (12-14)；

So as to form level-one circular passage（12-61）With two level circular passage（12-62）Whole girth, radial passage（12- 14）Radical length be effective damping length.
A kind of 2. combined type MR fluid shock absorber according to claim 1, it is characterised in that：In external valve (12), The upper and lower wall of level-one circular passage (12-61) and two level circular passage (12-62) use permeability magnetic material, level-one circular passage The inside and outside wall of (12-61) and two level circular passage (12-62) use magnetic separator；Level-one annular magnetic inductive block (12-101), two level Annular magnetic inductive block (12-102), magnetic conductive cylinder (12-5), valve deck (12-2), valve seat (12-11) use permeability magnetic material, spool (12- 7), upper Supporting cover (12-9), every magnetic cylinder (12-4) use magnetic separator；

So that magnetic field path is successively by radial passage (12-14), two level circular passage (12-62), two level annular magnetic inductive block (12-102), level-one circular passage (12-61), level-one annular magnetic inductive block (12-101), magnetic conductive cylinder (12-5), valve deck (12-2), Valve seat (12-11) forms closed circuit, and most magnetic lines of force all pass perpendicularly through level-one circular passage (12-61), two-stage ring Magnetic flow liquid in shape passage (12-62), radial passage (12-14), level-one circular passage (12-61) and two level circular passage The circumferential flow direction of magnetic flow liquid in (12-62) is vertical with the magnetic line of force, and the magnetic flow liquid in radial passage (12-14) is radially Flow direction is vertical with the magnetic line of force.
A kind of 3. combined type MR fluid shock absorber according to claim 1, it is characterised in that：The middle cylinder barrel (2) Both ends use undergauge structure, the first sealing ring (4-1) and the second sealing ring (4-2) is respectively adopted and realizes and work cylinder barrel (3) The sealing of relevant position.
A kind of 4. combined type MR fluid shock absorber according to claim 1, it is characterised in that：The piston assembly (7) The check valve of upper arrangement is flowing valve (7-3) and stretching valve (7-5), and the check valve installed on bottom valve assembly (9) is recuperation valve (9- 3) it is formed by stacking with compression valve (9-5), flowing valve (7-3) and recuperation valve (9-3) by relatively thin few piece circular ring shape valve block, stretches valve (7-5) and compression valve (9-5) are formed by stacking by thicker multi-disc circular ring shape valve block.
A kind of 5. combined type MR fluid shock absorber according to claim 4, it is characterised in that：It is the normal restoration stage, living Assembly (7) uplink is filled in, flowing valve (7-3), stretching valve (7-5), compression valve (9-5) are in normal closed mode, and recuperation valve (9-3) holds Easily to open, the magnetic flow liquid in recovery chamber (Z-1) enters intermediate cavity (Y) by the first normal open hole (3a) of work cylinder barrel (3) upper end, Shoe cream room (X) is converged into via external valve (12), and the magnetic flow liquid in shoe cream room (X) is by recuperation valve (9-3) compensation to compression Chamber (Z-2)；

Normal compression stage, piston assembly (7) downlink, stretching valve (7-5), recuperation valve (9-3), compression valve (9-5), which are in, often closes Closed state, flowing valve (7-3) are opened, and the magnetic flow liquid in compression chamber (Z-2) enters recovery chamber (Z- by flowing valve (7-3) 1), the magnetic flow liquid in recovery chamber (Z-1) enters intermediate cavity (Y) by the first normal open hole (3a) of work cylinder barrel (3) upper end, via External valve (12) converges into shoe cream room (X)；

Normal compression and recovery phase, magnetic flow liquid flow by external valve (12) one-way circulation and implement viscosity control, real The regulation and control of existing damping force；Under extreme working position, stretching valve (7-5) and compression valve (9-5) implement overload protection, appropriate to open, Damper works according to Passive Mode.