Compact magnetorheological damper

Abstract

The utility model discloses a compact magnetorheological damper which comprises a lower lifting lug, a lower end cover, a floating piston, an inner cylinder, a coil framework, an outer cylinder, a dust cover, an upper lifting lug, a piston rod, a guider, a piston head, a coil and a magnetorheological fluid area. A magnetorheological fluid area is defined by the inner cylinder and the lower end cover, and the magnetorheological fluid area is filled with magnetorheological fluid; an annular magnetorheological effect runner is formed between the outer wall of the inner cylinder and the inner wall of the coil framework; the floating piston and the coil unit are placed between the cylinder body and the inner cylinder body together, the defects that a floating piston of a traditional single-cylinder magnetorheological damper occupies the stroke space of the damper and an electromagnetic unit and a piston rod move at the same time, so that the electromagnetic unit is prone to damage are overcome, the reliability of the magnetorheological damper is improved, and the application range of the magnetorheological damper is widened.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compact magnetorheological damper. BACKGROUND

[0002] In the fields of military and civilian vehicles, engineering machinery, engineering vehicles, medical devices, industrial processing and equipment damping, magnetorheological dampers using magnetorheological fluid as working medium are increasingly applied to realize technical effects such as damping, buffering and comfort experience; at present, magnetorheological technology and equipment are in a period of large-scale growth in technology and application in the world and China.

[0003] Magnetorheological fluid is a kind of liquid whose viscosity changes with the appearance of magnetic field, which is a stable suspension system composed of soft magnetic particles with high magnetic permeability and low magnetic hysteresis uniformly dispersed in non-magnetic carrier liquid by the action of surfactant; the working principle of magnetorheological fluid is that under the action of an external magnetic field, each particle is polarized into a magnetic dipole, and the dipoles attract each other to form a chain-like structure between the two magnetic pole plates, like a bridge, which hinders the normal flow of the fluid and makes it exhibit solid-like characteristics; when the external magnetic field is removed, the fluid returns to its original state, i.e. the magnetorheological fluid quickly and reversibly converts between liquid and solid states; the degree of solidification is in a stable and reversible relationship with the current intensity, i.e. by controlling the current intensity, the shear yield strength of the solidified magnetorheological fluid can be accurately controlled; based on this characteristic, we produce a magnetorheological damper with adjustable damping force.

[0004] When the magnetorheological damper is working, the piston moves in the cylinder at a reciprocating speed, and the magnetorheological fluid flows through the flow channel on the piston; the magnetorheological fluid in the flow channel is exposed to a changing magnetic field generated by providing a varying current to the coil arranged in the piston; the piston is formed by combining a metal soft magnetic material with an electric coil to form an electromagnet; the electromagnet applies a magnetic field to the magnetorheological fluid in the flow channel; the application of the magnetic field causes the tiny metal particles in the magnetorheological fluid to form chains at the opening, which are usually arranged along the direction of magnetic flux and perpendicular to the flow of the magnetorheological fluid through the piston; the chain of tiny metal particles restricts the movement of the magnetorheological fluid through the piston opening and causes the yield stress of the magnetorheological fluid to increase; the increase of the yield stress of the magnetorheological fluid leads to an increase of force in the magnetorheological damper.

[0005] At present, the single cylinder rheological shock absorber on the market is designed to set the electromagnetic unit of the shock absorber together with the piston head, and the volume compensation cavity is set in series, which will affect the stroke of the shock absorber, and it is difficult to arrange when encountering a compact stroke vehicle; at the same time, since the traditional electromagnetic valve is arranged on the moving piston head, it moves with the movement of the piston rod, and since the piston head directly contacts the magnetorheological fluid, a high pressure is generated during the movement, therefore, there is a risk of magnetorheological fluid leakage from the electromagnetic unit outlet; therefore, how to solve the stroke limitation of the single cylinder magnetorheological shock absorber and how to reduce the risk of electromagnetic unit outlet become the bottleneck restricting the wider use of magnetorheological shock absorber. Utility model content

[0006] The utility model discloses a compact magnetorheological damper to solve the problem in the foregoing background art.

[0007] To achieve the above object, the utility model provides the following technical scheme:

[0008] A compact magnetorheological damper, including lower lug, lower end cover, floating piston, inner tube, coil framework, outer tube, dust cover, upper lug, piston rod, guider, piston head, coil, magnetorheological fluid area, the inner tube and lower end cover enclose and form magnetorheological fluid area, and the magnetorheological fluid area is filled with magnetorheological liquid body, the annular magnetorheological effect flow channel is formed between the outer wall of inner tube and the inner wall of coil framework, and the upper and lower ends of inner tube are respectively provided with through holes to communicate magnetorheological fluid area and magnetorheological effect flow channel, the floating piston is annular structure, is set between outer tube and coil framework, and forms volume compensation cavity between its upper surface and coil framework, the outer wall of coil framework is wound with coil, the piston head is fixed to the end of piston rod, and is slidably connected with inner tube, and is used to push magnetorheological fluid to flow between magnetorheological fluid area and magnetorheological effect flow channel to generate damping force.

[0009] As a preferred scheme of the utility model: the guider is sleeved on the piston rod and is used for guiding sealing.

[0010] As a further preferred scheme of the utility model: the lower lug and the upper lug are fixed to the lower end cover and the guider respectively and are used for connecting the vehicle body.

[0011] As a further preferred scheme of the utility model: the guider and the piston rod and the inner tube and the outer tube are embedded with guide rings, the guide ring is wear-resistant polymer material and is used for reducing the friction and lateral force of relative motion parts.

[0012] As a further preferred scheme of the utility model: an internal buffer block is arranged between the top of inner tube and guider, the buffer block is elastic rubber material and is used for limiting the limit displacement of piston head and buffering collision.

[0013] As a further preferred scheme of the utility model: the contact surface of the floating piston and the volume compensation cavity is equipped with a compensation cavity sealing element, the sealing element is an O-shaped rubber ring, which is used for isolating the high-pressure gas in the compensation cavity.

[0014] As a further preferred scheme of the utility model: the diameter of the via hole is 3-15mm.

[0015] Compared with the prior art, the utility model has the beneficial effects that: the device realizes integrated arrangement of the compensation cavity, and makes the electromagnetic unit isolated from the magnetorheological fluid, greatly improves the design limit of the magnetorheological damper, and improves the reliability of the magnetorheological damper; by placing the floating piston and the coil unit together between the cylinder body and the inner cylinder body, the shortcomings of the traditional single-cylinder magnetorheological damper floating piston occupying the damper stroke space and the electromagnetic unit and the piston rod moving at the same time causing the electromagnetic unit vulnerable are avoided, and the reliability and application range of the magnetorheological damper are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the overall internal structure of the utility model.

[0017] In the figure, 1 is a lower lifting lug, 2 is a lower end cover, 3 is a floating piston, 4 is an inner cylinder, 5 is a coil framework, 6 is an outer cylinder, 7 is a dust cover, 8 is an upper lifting lug, 9 is a piston rod, 10 is a guide, 11 is a piston head, 12 is a coil, 13 is a magnetorheological fluid area, 14 is a magnetorheological effect flow channel, and 15 is a volume compensation cavity. DETAILED DESCRIPTION

[0018] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0019] In the description of the utility model, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "connection", "connect" should do the broad sense understanding, for example, can be fixed connection, can be detachable connection, or integrally connected;Can be mechanical connection, can be electrical connection;Can be directly connected, can be indirectly connected through the intermediate medium, can be the communication inside two elements.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0021] Please refer to Figure 1 The utility model discloses a compact magnetorheological damper, including lower lug 1, lower end cover 2, floating piston 3, inner tube 4, coil former 5, outer tube 6, dust cover 7, upper lug 8, piston rod 9, guider 10, piston head 11, coil 12, magnetorheological liquid area 13, the inner tube 4 is enclosed with lower end cover 2 and forms magnetorheological liquid area 13, the magnetorheological liquid area 13 is filled with magnetorheological liquid, the annular magnetorheological effect flow channel 14 is formed between the outer wall of inner tube 4 and the inner wall of coil former 5, and the upper and lower ends of inner tube 4 are respectively provided with through holes to communicate magnetorheological liquid area 13 and magnetorheological effect flow channel 14, the floating piston 3 is annular structure, is set up between outer tube 6 and coil former 5, and the upper surface is formed with volume compensation cavity 15 between coil former 5, the outer wall of coil former 5 is wound with coil 12, the piston head 11 is fixed in the end of piston rod 9, and is slidably connected with inner tube 4, for pushing magnetorheological liquid to flow between magnetorheological liquid area 13 and magnetorheological effect flow channel 14 to generate damping force;

[0022] The guider 10 is sleeved on the piston rod 9 and is used for guiding sealing;

[0023] The lower lug 1 and the upper lug 8 are fixed to the lower end cover 2 and the guider 10 respectively, and are used for connecting the vehicle body;

[0024] The guider 10 and the piston rod 9 and the inner tube 4 and the outer tube 6 are embedded with guide rings, the guide ring is made of wear-resistant polymer material, and is used for reducing the friction and lateral force of the relative motion parts;

[0025] An internal buffer block is arranged between the top of the inner tube 4 and the guider 10, the buffer block is made of elastic rubber material, and is used for limiting the limit displacement of the piston head 11 and buffering the collision;

[0026] The contact surface of the floating piston 3 and the volume compensation cavity 15 is provided with a compensation cavity sealing element, the sealing element is an O-shaped rubber ring, and is used for isolating the high-pressure gas in the volume compensation cavity 15.

[0027] Further, the number of vias arranged at each end is six, and the six vias at each end are uniformly distributed along the circumferential direction, and the diameter of the via is 3-15mm; during the up-down movement of the piston head, the magnetorheological fluid is pushed to flow through the via and enter the magnetorheological effect channel 14; in the specific implementation, the gap size of the magnetorheological effect channel 14 is variable to realize the requirement of different dynamic ranges.

[0028] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0029] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A compact magnetorheological damper comprising: Lower lug (1), lower end cover (2), floating piston (3), inner cylinder (4), coil former (5), outer cylinder (6), dust cover (7), upper lug (8), piston rod (9), guide (10), piston head (11), coil (12), magnetorheological fluid area (13); characterized in that: The inner cylinder (4) and the lower end cover (2) form a magnetorheological fluid area (13), and the magnetorheological fluid area (13) is filled with magnetorheological liquid; The annular magnetorheological effect flow channel (14) is formed between the outer wall of the inner cylinder (4) and the inner wall of the coil former (5), and the upper and lower ends of the inner cylinder (4) are respectively provided with through holes to communicate the magnetorheological fluid area (13) and the magnetorheological effect flow channel (14); The floating piston (3) is of annular structure, arranged between the outer cylinder (6) and the coil former (5), and the upper surface thereof and the coil former (5) form a volume compensation cavity (15); The coil former (5) is wound with a coil (12) for generating a magnetic field for regulating the viscosity of the magnetorheological fluid; The piston head (11) is fixed to the end of the piston rod (9) and is in sliding fit with the inner cylinder (4), and is used to push the magnetorheological fluid to flow between the magnetorheological fluid area (13) and the magnetorheological effect flow channel (14) to generate damping force; The guide (10) is sleeved on the piston rod (9) for guiding and sealing; The lower lug (1) and the upper lug (8) are respectively fixed to the lower end cover (2) and the guide (10) for connecting the vehicle body.

2. A compact magneto-rheological damper according to claim 1, wherein, The guide (10) and the piston rod (9), and the inner cylinder (4) and the outer cylinder (6) are embedded with guide rings.

3. A compact magneto-rheological damper according to claim 2, wherein, An internal buffer block is arranged between the top of the inner cylinder (4) and the guide (10) for limiting the limit displacement of the piston head (11) and buffering the impact.

4. A compact magneto-rheological damper according to claim 1 or 2 or 3, characterized in that, The contact surface between the floating piston (3) and the volume compensation cavity (15) is provided with a sealing element, which is an O-shaped rubber ring for isolating the high-pressure gas in the volume compensation cavity (15).

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