Magneto-rheological shock absorber

Abstract

The magnetorheological damper comprises an outer cylinder, an inner cylinder arranged in the outer cylinder, a coil assembly fixed in the inner cylinder and a piston rod penetrating through the outer cylinder, the inner cylinder and the coil assembly, the lower end of the piston rod is connected with a piston, an outer magnetic flow channel is formed in the outer cylinder, and an inner magnetic flow channel is formed in the inner cylinder. The upper end and the lower end of the inner cylinder are provided with circulation openings communicated with the outer magnetic flow channel and the inner magnetic flow channel, and the coil assembly is provided with magnetic flow gaps communicated with the circulation openings and the magnetic flow channels, so that reliability and stability of reciprocating motion of the piston rod are guaranteed, the problem that a piston ring is prone to abrasion is solved, and the service life of the shock absorber is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration dampers, and in particular to a magnetorheological vibration damper. Background Art

[0002] In order to ensure the stability of the piston assembly during movement, some existing magnetorheological dampers generally have a guide installed in the cylinder, and the coil assembly is installed on the piston assembly and moves up and down with the piston assembly. This structure not only places high demands on the seal of the guide, but also for the magnetorheological damper, the iron powder in the magnetorheological fluid will cause great pressure on the guide bushing and seal, greatly shortening their service life. Summary of the invention

[0003] The object of the present invention is to provide a magnetorheological damper with low sealing requirement and long service life.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a magnetorheological damper, which includes an outer cylinder, an inner cylinder arranged in the outer cylinder, a coil assembly fixed in the inner cylinder, and a piston rod passing through the outer cylinder, the inner cylinder and the coil assembly, the lower end of the piston rod is connected to a piston, the interior of the outer cylinder forms an external magnetic flow channel, the interior of the inner cylinder forms an internal magnetic flow channel, the upper and lower ends of the inner cylinder are provided with flow openings connecting the external magnetic flow channel and the internal magnetic flow channel, and the coil assembly is provided with a magnetic flow gap connected to the flow opening and the magnetic flow channel.

[0005] In one embodiment, the coil assembly includes at least a first coil group and a second coil group, the first coil group is located at the upper end of the inner cylinder, and the second coil group is located at the lower end of the inner cylinder.

[0006] In one embodiment, the piston reciprocates between the first coil assembly and the second coil assembly.

[0007] In one embodiment, the first coil assembly includes a coil housing, a coil body sleeved in the coil housing, and a first coil sleeved on the coil body, and a gap is provided between an outer wall of the coil body and an inner wall of the coil housing to form the magnetic flow gap.

[0008] In one embodiment, the top and bottom ends of the coil housing are respectively provided with a top cover and a bottom cover, the top cover is provided with a first flow hole, the bottom cover is provided with a second flow hole, and the first flow hole, the second flow hole and the magnetic flow gap are connected.

[0009] In one embodiment, the second coil group has the same structure as the first coil group.

[0010] In one embodiment, a piston ring is provided between the coil housing and the inner wall of the inner cylinder.

[0011] In one embodiment, the magnetorheological damper further includes a hollow rod, and the second coil group is connected to a wire, and the wire passes through the hollow rod and out of the outer cylinder.

[0012] In one embodiment, the coil assembly further includes a third coil group and / or a fourth coil group, and the third coil group and / or the fourth coil group are located between the first coil group and the second coil group.

[0013] In one embodiment, the outer cylinder is filled with nitrogen.

[0014] After adopting the above technical solution, the present invention has the following advantages:

[0015] 1. In the present invention, the magnetorheological shock absorber is configured to include an outer cylinder, an inner cylinder, a coil assembly and a piston rod, and the coil assembly is fixed in the inner cylinder. When the piston rod reciprocates in the inner cylinder, it can be limited and guided by the coil assembly, thereby ensuring the reliability and stability of the reciprocating motion of the piston rod, while improving the problem of easy wear of the piston ring, thereby increasing the service life of the shock absorber. In addition, since the coil assembly is fixed and acts as a guide, the problem of setting a complex guide structure and easy damage of the seal is avoided, the sealing requirement and assembly difficulty are reduced, and the overall purchase cost of the shock absorber is reduced.

[0016] 2. By setting the coil assembly to include at least the first coil group and the second coil group, and setting the first coil group and the second coil group separately up and down, not only can the piston rod be guided and limited well to ensure the stability and reliability of the piston rod during reciprocating motion, but also when the piston moves up and down, the magnetic induction between the magnetorheological fluid and the coil assembly can be greatly enhanced, and the two coil groups can be adjusted simultaneously to greatly increase the adjustable damping range.

[0017] 3. By arranging the piston between the first coil group and the second coil group, the piston can better drive the magnetorheological fluid to flow into the outer cylinder or back to the inner cylinder along the magnetic flow gap at the upper and lower ends during reciprocating motion, thereby generating a damping force, and realizing simultaneous adjustment of the two coil assemblies, thereby further greatly increasing the adjustable damping range.

[0018] 4. By configuring the first coil group to include a coil shell, a coil body sleeved in the coil shell, and a first coil sleeved on the coil body, the gap between the outer wall of the coil body and the inner wall of the coil shell is used to form the magnetic flow gap. This not only ensures that the magnetorheological fluid passes through the coil group to produce a good magnetic induction change with the coil group, but also the overall structure of the coil group is simple, which is convenient for production and assembly.

[0019] 5. By respectively arranging a top cover and a bottom cover at the top and bottom ends of the coil housing, and arranging a first flow hole on the top cover, and arranging a second flow hole on the bottom cover, not only can the coil body and the coil be well fixed in the coil housing, thereby ensuring the good function of the coil group as a whole, but also the first flow hole and the second flow hole can realize good communication with the magnetic flow gap, thereby ensuring smooth and reliable passage of the magnetorheological fluid.

[0020] 6. A piston ring is arranged between the coil housing and the inner wall of the inner cylinder so that the coil housing and the inner wall of the inner cylinder are better fixed and will not come loose.

[0021] 7. By setting a hollow rod, the wire of the coil group can pass through the outer tube, so as to facilitate signal connection with the outside and better transmit the signal.

[0022] 8. By setting the third and / or fourth coil group, the reciprocating motion of the piston can be further enhanced, and the magnetorheological fluid flows into the outer cylinder or flows back to the inner cylinder along the magnetic flow gap at the upper and lower ends, thereby generating damping force, and the two coils are adjusted simultaneously to greatly increase the adjustable damping range.

[0023] 9. By filling the outer cylinder with nitrogen, the pressure in the outer cylinder and the inner cylinder is ensured to be stable, so that the damping force can be generated better and more stably to achieve a better vibration reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a cross-sectional view of the magnetorheological damper of the present invention.

[0026] Figure 2 for Figure 1 A is an enlarged view of the middle image.

[0027] Figure 3 for Figure 1 Enlarged view of B.

[0028] The names of the components in the figure are as follows:

[0029] 100. Magnetorheological damper;

[0030] 1. Outer cylinder; 11. Outer magnetic flow channel; 2. Inner cylinder; 21. Inner magnetic flow channel; 22. Flow opening; 3. Coil assembly; 31. First coil group; 311. Coil housing; 312. Coil body; 313. First coil; 314. Top cover; 3141. First flow hole; 315. Bottom cover; 3151. Second flow hole; 32. Second coil group; 33. Magnetic flow gap; 4. Piston rod; 5. Piston; 6. Piston ring; 7. Hollow rod; 8. Wire. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0032] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0033] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected bodies are not connected through an intermediate structure, but are only connected to form a whole through a connecting structure. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0036] like Figures 1 to 3As shown, the present invention provides a magnetorheological damper, comprising an outer cylinder 1, an inner cylinder 2 arranged in the outer cylinder 1, a coil assembly 3 fixed in the inner cylinder 2, and a piston rod 4 passing through the outer cylinder 1, the inner cylinder 2 and the coil assembly 3, the lower end of the piston rod 4 is connected to a piston 5, the outer cylinder 1 is cylindrical, the outer cylinder 1 forms an outer magnetic flow channel 11, the inner cylinder 2 is correspondingly cylindrical, and the inner cylinder 2 forms an inner magnetic flow channel 21, the upper and lower ends of the inner cylinder 2 are provided with flow openings 22 connecting the outer magnetic flow channel 11 and the inner magnetic flow channel 21, the coil assembly 3 is provided with a magnetic flow gap 33 connected with the flow opening 22 and the inner and outer magnetic flow channels (11, 22), the magnetorheological damper of this structure is not only simple in structure, but also has good functions.

[0037] In this embodiment, the coil assembly 3 at least includes a first coil group 31 and a second coil group 32, the first coil group 31 is located at the upper end of the inner tube 2, and the second coil group 32 is located at the lower end of the inner tube 2, and the first coil group 31 and the second coil group 32 are fixed in the inner tube 2, so that when the piston rod reciprocates in the inner tube, it can be limited and guided by the coil assembly, ensuring the reliability and stability of the reciprocating motion of the piston rod, while improving the problem of easy wear of the piston ring, thereby improving the service life of the shock absorber, and because the coil assembly is fixed and acts as a guide, it avoids the problem of setting a guide with a complex structure and the problem of easy damage of the seal, reduces the sealing requirements and assembly difficulty, and also reduces the overall procurement cost of the shock absorber; and the first coil group 31 and the second coil group 32 are separately arranged up and down, so that not only can the piston rod be well guided and limited, ensuring the stability and reliability of the piston rod when reciprocating, but also when the piston moves up and down, the magnetic induction between the magnetorheological fluid and the coil assembly can be greatly enhanced, and the two coil groups are adjusted at the same time to greatly increase the adjustable damping range.

[0038] In some embodiments, in order to enhance the magnetic induction change between the magnetorheological fluid and the coil group, the piston 5 can be set to reciprocate between the first coil group 31 and the second coil group 32 to drive the magnetorheological fluid to reciprocate between the two coil groups. The magnetic induction change makes it possible for the piston to better drive the magnetorheological fluid to flow into the outer cylinder or back into the inner cylinder along the magnetic flow gap at the upper and lower ends when reciprocating, thereby generating a damping force, achieving simultaneous adjustment of the two coil assemblies, thereby further greatly increasing the adjustable damping range.

[0039] In some embodiments, the first coil group 31 includes a coil shell 311, a coil body 312 sleeved in the coil shell 311, and a first coil 313 sleeved on the coil body 312. A gap is provided between the outer wall of the coil body 312 and the inner wall of the coil shell 311 to form the magnetic flow gap 33. This not only ensures that the magnetorheological fluid passes through the coil group to produce a good magnetic induction change with the coil group, but also the overall structure of the coil group is simple, which is convenient for production and assembly.

[0040] In some embodiments, a top cover 314 and a bottom cover 315 may be provided at the top and bottom ends of the coil housing 311, respectively; the top cover 314 is provided with a first flow hole 3141, and the bottom cover 315 is provided with a second flow hole 3151; the first flow hole 3141, the second flow hole 3151 and the magnetic flow gap 33 are connected and arranged, so that not only the coil body and the coil can be well fixed in the coil housing, thereby ensuring the good function of the coil group as a whole, but also the first flow hole and the second flow hole can be well connected with the magnetic flow gap, thereby ensuring that the magnetorheological fluid passes smoothly and reliably.

[0041] In some embodiments, a piston ring 6 may be provided between the coil housing 311 and the inner side wall of the inner cylinder 2 to better fix the coil housing and the inner side wall of the inner cylinder and prevent them from loosening; and a hollow rod 7 is provided at the lower end of the inner cylinder 2, and the second coil group 32 is connected to a wire 8, and the wire 8 passes through the hollow rod 7 to pass out of the outer cylinder 1. In this way, the wire of the coil group can pass through the outer cylinder through the hollow rod, thereby facilitating signal connection with the outside and better transmitting the signal.

[0042] Furthermore, in some embodiments, nitrogen may be filled in the outer tube 1 to ensure that the pressure in the outer tube and the inner tube is stable, so that the damping force can be generated better and more stably to achieve a better vibration reduction effect.

[0043] In addition, in some embodiments, and it can be understood that the coil assembly 3 also includes a third coil group and / or a fourth coil group, and the piston rod passes through the first coil group and the third coil group, and the piston is located between the third coil group and the fourth coil group and reciprocates, so that the first coil group and the third coil group form two guides, which can better limit and fix the piston rod, and ensure the reliability and stability of the reciprocating motion of the piston rod; at the same time, when the piston reciprocates between the third coil group and the fourth coil group, it can well enhance the magnetic induction between the magnetorheological fluid and the fourth coil group and the second coil group, and realize the simultaneous adjustment of the four coil assemblies, thereby further greatly increasing the adjustable damping range. Of course, the number is not limited to this, and different numbers of coil groups can be set according to specific needs.

[0044] In addition to the above preferred embodiments, the technical solutions protected by the present invention are not limited to the above embodiments. It should be pointed out that the combination of the technical solutions of any embodiment with the technical solutions of one or more other embodiments is within the protection scope of the present invention. Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to it based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A magnetorheological damper, characterized in that: The invention comprises an outer cylinder, an inner cylinder arranged in the outer cylinder, a coil assembly fixed in the inner cylinder and a piston rod passing through the outer cylinder, the inner cylinder and the coil assembly, the lower end of the piston rod is connected with a piston, an outer magnetic flow channel is formed inside the outer cylinder, an inner magnetic flow channel is formed inside the inner cylinder, flow openings connecting the outer magnetic flow channel and the inner magnetic flow channel are provided at the upper and lower ends of the inner cylinder, and a magnetic flow gap connected with the flow opening and the magnetic flow channel is provided on the coil assembly.

2. The magnetorheological damper according to claim 1, characterized in that: The coil assembly at least includes a first coil group and a second coil group, wherein the first coil group is located at the upper end of the inner cylinder, and the second coil group is located at the lower end of the inner cylinder.

3. The magnetorheological damper according to claim 2, characterized in that: The piston reciprocates between the first coil assembly and the second coil assembly.

4. The magnetorheological damper according to claim 2, characterized in that: The first coil assembly includes a coil housing, a coil body sleeved in the coil housing, and a first coil sleeved on the coil body. A gap is provided between an outer wall of the coil body and an inner wall of the coil housing to form the magnetic flow gap.

5. The magnetorheological damper according to claim 4, characterized in that: The top and bottom ends of the coil housing are respectively provided with a top cover and a bottom cover, the top cover is provided with a first flow hole, the bottom cover is provided with a second flow hole, and the first flow hole, the second flow hole and the magnetic flow gap are connected.

6. The magnetorheological damper according to claim 5, characterized in that: The second coil group has the same structure as the first coil group.

7. The magnetorheological damper according to claim 4, characterized in that: A piston ring is arranged between the coil shell and the inner side wall of the inner cylinder.

8. The magnetorheological damper according to claim 2, characterized in that: The magnetorheological vibration damper also includes a hollow rod, and the second coil group is connected to a wire, and the wire passes through the hollow rod and out of the outer cylinder.

9. The magnetorheological damper according to claim 2, characterized in that: The coil assembly further includes a third coil group and / or a fourth coil group, and the third coil group and / or the fourth coil group are located between the first coil group and the second coil group.

10. The magnetorheological damper according to claim 1, characterized in that: The outer cylinder is filled with nitrogen.

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