Modular magnetorheological damper with asymmetric damping force

Abstract

The invention discloses a modularized magneto-rheological shock absorber with asymmetric damping force. The modularized magneto-rheological shock absorber comprises a main cylinder barrel assembly and an external cylinder barrel assembly. The main cylinder barrel assembly comprises a main cylinder barrel body and a first-stage piston, the first-stage piston is arranged in the main cylinder barrel body in a controllable and sliding mode, and the main cylinder barrel body is filled with magnetorheological fluid; the external cylinder barrel assembly comprises an external cylinder barrel body and a second-stage piston installed in the external cylinder barrel body. The two axial ends of the external cylinder barrel body communicate with the main cylinder barrel body and are correspondingly located on the two sides of the sliding direction of the first-stage piston correspondingly. The magnetorheological fluid can flow between the main cylinder barrel body and the external cylinder barrel body in a reciprocating mode along with sliding of the first-stage piston. Through modularization and innovation of asymmetric damping force output, the manufacturing cost is remarkably reduced, the production efficiency and the working stability are improved, meanwhile, the flexibility and the adaptability of the damper are greatly enhanced, and powerful support is provided for wide application and further development of the magnetorheological damping technology.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration suppression and relates to a modular magnetorheological shock absorber with asymmetric damping force. Background Art

[0002] As an emerging smart material application technology, magnetorheological technology has gained wide attention and application in the field of vibration suppression in recent years. Magnetorheological fluid (MR Fluid) can quickly and reversibly transform from a low-viscosity fluid to a high-viscosity solid under the action of a magnetic field. This property enables the magnetorheological damper (MRD) to achieve fast response and adjustable damping effect, and is suitable for a variety of occasions that require dynamic vibration reduction and control, such as vehicle suspension systems, structural vibration control, precision mechanical positioning, etc.

[0003] In the design of traditional magnetorheological dampers, the coil is usually integrated with the piston, and the wire needs to be led out of the damper through the piston rod to achieve power control. This structural form brings two main problems:

[0004] 1. Dynamic sealing challenge: The wire passes through the moving part of the piston rod, and the dynamic sealing problem of the wire must be solved to prevent the leakage of magnetorheological fluid and the entry of foreign impurities. The realization of dynamic sealing is usually more complicated and requires precise seals and strict assembly processes, which not only increases the manufacturing cost, but may also affect the long-term reliability and maintenance cost of the damper.

[0005] 2. Lack of flexibility and modularity: Due to the close integration of the coil and the piston, when the application scenario changes, such as the working stroke, damping force requirements, etc., the key structures of the damper, such as the piston rod and piston, need to be redesigned and manufactured, and rapid adjustment and modular production cannot be achieved. This limits the company's ability to respond quickly to different market demands and increases the cycle and cost of new product development.

[0006] Therefore, the structural design of traditional MR dampers has, to some extent, hindered their application in a wider range of fields, especially in scenarios that require low cost, rapid customization, and high reliability.

[0007] To solve the above problems, in view of the limitations of traditional magnetorheological dampers, an innovative structure of shock absorber is needed to overcome the existing technical difficulties and achieve a more flexible, efficient and economical magnetorheological damper solution to realize the low cost, modularity and asymmetric damping force output characteristics of magnetorheological dampers. Summary of the invention

[0008] In view of this, the present invention provides a modular magnetorheological shock absorber with asymmetric damping force. By separately setting two cylinders, the primary piston in the main cylinder drives the magnetorheological fluid to flow, and the secondary piston in the external cylinder is used to generate a magnetic field to provide electromagnetic damping force. The simple structure and independent design of the primary piston increase the working stroke of the damper and expand the working area of ​​the magnetorheological fluid, thereby improving the overall force output of the damper, which is particularly important for application scenarios requiring larger damping force and stroke.

[0009] The invention discloses a modular magnetorheological shock absorber with asymmetric damping force, comprising:

[0010] The master cylinder assembly comprises a master cylinder body and a primary piston, wherein the primary piston is controllably slidably disposed in the master cylinder body, and the master cylinder body is filled with magnetorheological fluid;

[0011] The external cylinder assembly comprises an external cylinder body and a secondary piston installed in the external cylinder body, wherein both ends of the external cylinder body in the axial direction are connected to the main cylinder body and are respectively located on both sides of the sliding direction of the primary piston;

[0012] The magnetorheological fluid can flow back and forth between the main cylinder body and the external cylinder body along with the sliding of the first-stage piston.

[0013] Furthermore, the master cylinder assembly also includes a floating piston, the master cylinder body includes a first chamber and a second chamber arranged in sequence along the axial direction, the primary piston is slidably arranged in the first chamber, and the floating piston can be limited and slidably arranged in the second chamber along with the sliding of the primary piston.

[0014] Furthermore, the master cylinder assembly also includes a left end cover and a right end cover, the left end cover is installed at the end corresponding to the first chamber of the master cylinder body, and the right end cover is installed at the end corresponding to the second chamber of the master cylinder body.

[0015] Furthermore, the first-stage piston is provided with a radially penetrating flow channel, and there are multiple flow channels, which are arranged along the circumference of the first-stage piston. A one-way valve is provided in any flow channel, and the flow direction of the one-way valve is from the left end cover to the right end cover.

[0016] Furthermore, the first chamber and the second chamber are connected to each other, and the diameter of the first chamber is smaller than that of the second chamber so that the inner surface of the main cylinder tube forms a stepped structure.

[0017] Furthermore, the external cylinder assembly also includes a piston bracket, and piston brackets are installed at both axial ends of the secondary piston. The secondary piston is installed in the external cylinder body through the piston bracket, and the radial gap between the secondary piston and the external cylinder body forms a damping channel.

[0018] Furthermore, the external cylinder assembly also includes a guide tube, and the guide tubes are installed at both axial ends of the external cylinder body, and the external cylinder body is connected to the first chamber of the main cylinder body through the guide tube.

[0019] Furthermore, the first-stage piston includes a piston body and a piston end plate, the one-way valve includes a ball and an elastic member, the circulation channel is arranged on the piston body, the ball is arranged to roll in the circulation channel, the piston end plate is attached to the piston body, the piston end plate is provided with an outlet at a position corresponding to the circulation channel, the elastic member is installed in the circulation channel, and the two ends of the elastic member respectively correspond to the ball and the piston end plate.

[0020] Furthermore, it also includes a piston rod, which passes through the left end cover and is connected to the piston body to control the sliding of the first-stage piston.

[0021] Furthermore, a winding groove is provided on the surface of the secondary piston along the circumferential direction, and a plurality of winding grooves are provided. The plurality of winding grooves are arranged along the axial direction of the secondary piston, and a coil is wound in any winding groove.

[0022] Beneficial effects of the present invention:

[0023] The modular magnetorheological shock absorber with asymmetric damping force disclosed in the present invention is provided with two cylinders respectively. The primary piston in the main cylinder drives the magnetorheological fluid to flow, and the secondary piston in the external cylinder is used to generate a magnetic field to provide electromagnetic damping force. The simple structure and independent design of the primary piston increase the working stroke of the damper and expand the working area of ​​the magnetorheological fluid, thereby improving the overall force output of the damper, which is particularly important for application scenarios that require larger damping force and stroke. In addition, the modular structural design greatly reduces the processing cost and significantly improves production efficiency. A one-way valve is innovatively provided on the primary piston, so that the flow path and throttling effect of the magnetorheological fluid are different in the tension and compression strokes of the primary piston, thereby generating an asymmetric damping force output. This feature can better meet the vibration control requirements under certain specific working conditions.

[0024] At the same time, in the present invention, since the secondary piston is stationary relative to the cylinder and does not participate in any movement, only the static sealing problem needs to be solved, which greatly simplifies the sealing structure and improves the overall stability and reliability of the device. Static sealing is easier to achieve than dynamic sealing, which reduces maintenance costs and failure rates. The present invention significantly reduces manufacturing costs, improves production efficiency and working stability through the innovation of modularization and asymmetric damping force output, and also greatly enhances the flexibility and adaptability of the damper, providing strong support for the widespread application and further development of magnetorheological vibration reduction technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the first-stage piston of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the main cylinder body of the present invention;

[0028] Figure 4 This is a schematic diagram of the medium flow direction when the first-stage piston of the present invention is stretched;

[0029] Figure 5 It is a schematic diagram of the medium flow direction when the first-stage piston of the present invention is compressed.

[0030] Figure 6 Magnetic circuit distribution of the coil of the secondary piston.

[0031] Figure markings: 1-left lifting ear, 2-piston rod, 3-left end cover, 4-guide belt, 5-sealing ring, 6-main cylinder body, 7-magnetorheological fluid, 8-piston body, 9-ball, 10-coil spring, 11-screw, 12-piston end plate, 13-floating piston, 14-right end cover, 15-inflating valve, 16-right lifting ear, 17-connector, 18-plug, 19-guide tube, 20-external cylinder end cover, 21-right bracket, 22-secondary piston, 23-coil, 24-external cylinder body, 25-left bracket, 26-wire connector. DETAILED DESCRIPTION

[0032] It should be noted that in the description of this specification, the terms "upper", "lower", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. Unless otherwise specified, the left and right in this embodiment correspond to the attached drawings. Figure 1 The installation and connection are achieved by conventional connection methods such as threaded connection, bonding, welding, etc., which can be understood by those skilled in the art and will not be elaborated here.

[0033] As shown in the figure, the present invention discloses a modular magnetorheological shock absorber with asymmetric damping force, comprising:

[0034] The master cylinder assembly includes a master cylinder body 6 and a primary piston. The primary piston is controllably slidably arranged in the master cylinder body 6, and the master cylinder body 6 is filled with magnetorheological fluid 7. The simple structure and independent design of the primary piston increase the working stroke of the damper and expand the working area of ​​the magnetorheological fluid 7, thereby improving the overall force output of the damper.

[0035] The external cylinder assembly includes an external cylinder body 24 and a secondary piston 22 installed in the external cylinder body 24. Both axial ends of the external cylinder body 24 are connected to the main cylinder body 6 and are respectively located on both sides of the sliding direction of the primary piston; the surface of the secondary piston 22 is provided with winding grooves along the circumference, and there are multiple winding grooves, which are arranged along the axial direction of the secondary piston 22, and a coil 23 is wound in any winding groove. The secondary piston 22 is stationary relative to the cylinder and does not participate in any movement. Therefore, only the static sealing problem needs to be solved, which greatly simplifies the sealing structure and improves the overall stability and reliability of the device. Static sealing is easier to achieve than dynamic sealing, which reduces maintenance costs and failure rates.

[0036] The magnetorheological fluid 7 can flow back and forth between the main cylinder body 6 and the external cylinder body 24 with the sliding of the first-stage piston. In this embodiment, the sliding of the first-stage piston can generate fluid damping force. At the same time, the first-stage piston drives the magnetorheological fluid 7 to flow back and forth in an orderly manner between the main cylinder body 6 and the external cylinder body 24, so that the magnetorheological fluid 7 will not only generate fluid damping force but also electromagnetic damping force when flowing over the surface of the second-stage piston 22. At the same time, the modular structural design greatly reduces the processing cost and significantly improves the production efficiency.

[0037] In this embodiment, the master cylinder assembly further includes a floating piston 13, the master cylinder body 6 includes a first chamber and a second chamber sequentially arranged along the axial direction, the primary piston is slidably arranged in the first chamber, and the floating piston 13 can be limited and slidably arranged in the second chamber along the sliding of the primary piston. In this embodiment, the first chamber and the second chamber are connected to each other, and the diameter of the first chamber is smaller than that of the second chamber so that the inner surface of the master cylinder forms a stepped structure. In this embodiment, the external cylinder assembly further includes a guide tube 19, and the guide tubes 19 are installed at both ends of the axial direction of the external cylinder body 24, and the external cylinder body 24 is connected to the first chamber of the master cylinder body 6 through the guide tube 19. In this embodiment, the master cylinder assembly further includes a left end cap 3 and a right end cap 14, the left end cap 3 is installed at the end corresponding to the first chamber of the master cylinder body 6, and the right end cap 14 is installed at the end corresponding to the second chamber of the master cylinder body 6, and the two end caps are installed at the two ends of the axial direction of the master cylinder respectively to seal the master cylinder as a whole. The stepped structure can limit the movement stroke of the floating piston 13, avoiding affecting the flow of the magnetorheological fluid 7 at the interface position of the guide tube 19. In this embodiment, two guide tubes 19 are provided, and the two guide tubes 19 are respectively provided at the two ends of the axial direction of the external cylinder body 24. At the same time, the left end cover 3 and the left cylinder body are respectively provided with joints 17 as shown in the figure for connecting the guide tube 19 at the positions close to the floating piston 13. The guide tube 19 is installed with a plug 18 to cooperate with the aforementioned joint 17 to realize the installation and connection of the guide tube 19; the first-stage piston slides at the position between the two joints 17. With the sliding of the first-stage piston, the magnetorheological fluid 7 flows out of the main cylinder body 6 through one joint 17 and the guide tube 19 and enters the external cylinder body 24, and then flows out of the external cylinder body 24 through the guide tube 19 and another joint 17 and enters the main cylinder body 6, and so on, to achieve vibration reduction and buffering.

[0038] In this embodiment, the primary piston is provided with a circulation channel that penetrates in the radial direction, and there are multiple circulation channels, which are arranged along the circumference of the primary piston. A one-way valve is provided in any circulation channel, and the circulation direction of the one-way valve is from the left end cover 3 to the right end cover 14. In this embodiment, the primary piston includes a piston body 8 and a piston end plate 12, and the one-way valve includes a ball 9 and an elastic member 10. The circulation channel is provided on the piston body 8, and the ball 9 is rollingly provided on the circulation channel. The piston end plate 12 is attached to the piston body 8, and the piston end plate 12 is provided with an outlet at a position corresponding to the circulation channel. The elastic member 10 is installed in the circulation channel, and the two ends of the elastic member 10 are respectively correspondingly abutted against the ball 9 and the piston end plate 12. As shown in the figure, the first-stage piston is a split structure, the elastic member 10 is a spring, including a piston body 8 and a piston end plate 12, the piston end plate 12 is installed on the piston body 8 by screws 11, the circulation channel is a stepped variable diameter channel, the diameter is small on the side close to the left end cover 3, the ball 9 and the elastic member 10 are successively installed in the large diameter part of the circulation channel, the ball 9 is arranged on the side close to the left end cover 3, after the piston end plate 12 is installed, the ball 9 and the elastic member 10 are limited in the circulation channel, and at the same time, the piston end plate 12 is provided with an outlet at the position corresponding to the circulation channel to facilitate the unidirectional outflow of the magnetorheological fluid 7 as shown in the figure. As shown in the figure, when the piston is stretched, the one-way valve is pushed open by the magnetorheological fluid 7, and the magnetorheological fluid 7 in the main cylinder body 6 flows from left to right, then enters the external cylinder body 24 from the right side of the external cylinder body 24, and then flows into the external cylinder body 24 from the left side of the external cylinder body 24, and flows back into the main cylinder; when the piston is compressed, the magnetorheological fluid 7 can only flow out of the main cylinder body 6 from the left side of the main cylinder body 6, then enter the external cylinder body 24 from the left side of the external cylinder body 24, and flow out from the right side back into the main cylinder body 6, while in the main cylinder body 6, the one-way valve is closed, and the magnetorheological fluid 7 cannot flow from right to left through the primary piston. In this embodiment, a one-way valve is innovatively set on the primary piston, so that the flow path and throttling effect of the magnetorheological fluid 7 are different in the stretching and compression strokes of the primary piston, thereby generating an asymmetric damping force output, and this feature can better meet the vibration control requirements under certain specific working conditions.

[0039] In this embodiment, the external cylinder assembly also includes a piston bracket, and the two axial ends of the secondary piston 22 are both equipped with piston brackets. The secondary piston 22 is installed in the external cylinder body 24 through the piston bracket, and the radial gap between the secondary piston 22 and the external cylinder body 24 forms a damping channel. The external cylinder in this embodiment is a cylinder with an opening on the right side, wherein two piston brackets are provided, namely a left bracket 24 and a right bracket 21 provided at the two axial ends of the secondary piston 22, respectively, and the piston bracket is connected to the secondary piston 22 through a mortise and tenon structure, and the external cylinder body 24 is closed by an external cylinder end cover 20, and the two ends of the secondary piston 22 are respectively abutted against the cylinder bottom (i.e., the left end) of the external cylinder body 24 and the external cylinder end cover 20, and are positioned by a key-slot to limit and position the secondary piston 22 in the external cylinder body 24, as shown in the figure. The external cylinder body 24 in this embodiment is also provided with a wire connector 26 as shown in the figure, so as to facilitate the lead-out of the coil 23 wire.

[0040] In this embodiment, a piston rod 2 is also included. As shown in the figure, the piston rod 2 passes through the left end cover 3 and is threadedly connected to the piston body 8 to control the sliding of the first-stage piston. In this embodiment, an air filling valve 15 is provided on the right end cover 14 to fill the second chamber with compensating gas. In this embodiment, a guide belt 4 and a sealing ring 5 are also provided at the contact position between the piston rod 2 and the left end cover 3, and a guide belt 4 is provided at the contact position between the piston end plate 12 and the main cylinder body 6 to separate the space on both sides of the first-stage piston and play a sliding guide role to avoid asymmetric damping during reciprocating sliding. A seal is also provided at the contact position between the floating piston 13 and the main cylinder body 6 to prevent the magnetorheological fluid 7 from entering the second chamber. In this embodiment, the piston rod 2 is equipped with a left lifting ear 1, and the right end cover 14 is equipped with a right lifting ear 16.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A modular magnetorheological damper with asymmetric damping force, characterized in that: include: A master cylinder assembly, comprising a master cylinder body and a primary piston, wherein the primary piston is controllably slidably disposed in the master cylinder body, and the master cylinder body is filled with magnetorheological fluid; The external cylinder assembly comprises an external cylinder body and a secondary piston installed in the external cylinder body, wherein both ends of the external cylinder body in the axial direction are connected to the main cylinder body and are respectively located on both sides of the sliding direction of the primary piston; The magnetorheological fluid can flow back and forth between the main cylinder body and the external cylinder body as the primary piston slides.

2. The modular magnetorheological damper with asymmetric damping force according to claim 1, characterized in that: The master cylinder assembly also includes a floating piston. The master cylinder body includes a first chamber and a second chamber arranged in sequence along the axial direction. The primary piston is slidably arranged in the first chamber. The floating piston can be limited and slidably arranged in the second chamber along with the sliding of the primary piston.

3. The modular magnetorheological damper with asymmetric damping force according to claim 2, characterized in that: The master cylinder assembly further includes a left end cover and a right end cover, wherein the left end cover is mounted on an end corresponding to the first chamber of the master cylinder body, and the right end cover is mounted on an end corresponding to the second chamber of the master cylinder body.

4. The modular magnetorheological damper with asymmetric damping force according to claim 3, characterized in that: The first-stage piston is provided with a circulation channel which penetrates in the radial direction. There are multiple circulation channels, which are arranged along the circumference of the first-stage piston. A one-way valve is provided in any of the circulation channels, and the circulation direction of the one-way valve is from the left end cover to the right end cover.

5. The modular magnetorheological damper with asymmetric damping force according to claim 2, characterized in that: The first chamber is connected to the second chamber, and the diameter of the first chamber is smaller than that of the second chamber so that the inner surface of the master cylinder forms a stepped structure.

6. The modular magnetorheological damper with asymmetric damping force according to claim 1, characterized in that: The external cylinder assembly also includes a piston bracket, and the piston brackets are installed at both axial ends of the secondary piston. The secondary piston is installed in the external cylinder body through the piston bracket, and the radial gap between the secondary piston and the external cylinder body forms a damping channel.

7. The modular magnetorheological damper with asymmetric damping force according to claim 2, characterized in that: The external cylinder assembly further includes a guide tube. Both axial ends of the external cylinder body are provided with guide tubes. The external cylinder body is connected to the first chamber of the main cylinder body through the guide tube.

8. The modular magnetorheological damper with asymmetric damping force according to claim 4, characterized in that: The primary piston includes a piston body and a piston end plate, the one-way valve includes a ball and an elastic member, the circulation channel is arranged on the piston body, the ball is arranged to roll on the circulation channel, the piston end plate is attached to the piston body, the piston end plate is provided with an outlet at a position corresponding to the circulation channel, the elastic member is installed on the circulation channel, and the two ends of the elastic member are respectively and correspondingly abutted against the ball and the piston end plate.

9. The modular magnetorheological damper with asymmetric damping force according to claim 1, characterized in that: It also includes a piston rod, which passes through the left end cover and is connected to the piston body to control the sliding of the first-stage piston.

10. The modular magnetorheological damper with asymmetric damping force according to claim 1, characterized in that: The surface of the secondary piston is provided with winding grooves along the circumferential direction, and a plurality of winding grooves are provided. The plurality of winding grooves are arranged along the axial direction of the secondary piston, and a coil is wound in any of the winding grooves.

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