A rotary eddy current vibration damper with adjustable damping

Abstract

The present invention provides a rotary eddy current vibration damper with adjustable damping, comprising a conductor cylinder, a rotating shaft, an outer cylinder, a screw, a screw nut and a permanent magnet group, wherein the screw nut is sleeved on the screw, the screw and the screw nut are both arranged inside the outer cylinder and the three are arranged coaxially, the screw nut is rotatably arranged on the inner wall of the outer cylinder through a second bearing, the rotating shaft is a hollow structure, the rotating shaft is sleeved on the outer periphery of the screw and the two are coaxial, one end of the rotating shaft is fixedly connected to the screw nut, the permanent magnet group comprises a plurality of permanent magnets, the plurality of permanent magnets are evenly annularly arranged on the outer wall of the rotating shaft, a conductor cylinder is arranged on the inner wall of the outer cylinder, and the conductor cylinder is arranged opposite to the permanent magnet. The conductor cylinder is adjusted in position in the axial direction of the outer cylinder by adjusting the nut, and then the mapping area of ​​the permanent magnet on the conductor cylinder is adjusted to achieve the range adjustment of the eddy current damping force.

Description

Technical Field

[0001] The invention relates to the technical field of vibration dampers, and in particular to a rotary eddy current vibration damper with adjustable damping. Background Art

[0002] The vibration reduction and isolation performance of the vehicle suspension system directly affects the vehicle's operating qualities such as stability and comfort. For a long time, the vehicle suspension system has gradually formed a passive spring-damper structure that is still used today. Its vibration reduction performance is gradually difficult to meet the requirements under the development trend of pursuing intelligence and comfort. In addition, the damping unit often uses viscous dampers such as hydraulic shock absorbers, which have the disadvantages of being difficult to maintain stable performance for a long time, oil leakage, being greatly affected by temperature, and having high requirements for intelligent technology. Therefore, the suspension system urgently needs to achieve a breakthrough.

[0003] The introduction of the inertial vessel-spring-damper suspension structure and the development of eddy current damping technology have brought new ideas to the design of the suspension system and quickly became a hot topic of research. The inertial vessel-spring-damper suspension structure can simultaneously attenuate low-frequency and high-frequency vibrations, and has a better vibration reduction effect on large impact vibrations. Eddy current damping is based on the principle of electromagnetic induction and has the advantages of no contact when damping is generated, no need for working fluid and sealing, good temperature adaptability, high reliability, good durability, etc. It has better adaptability than viscous damping. Therefore, the use of eddy current shock absorbers based on inertial vessels is an effective way to improve the vibration reduction and isolation performance of vehicle suspension systems.

[0004] However, using eddy current shock absorbers to replace the original hydraulic shock absorbers also has its shortcomings. The shock absorbers of the suspension system require a wide range of damping force and many reference speed points. In order to ensure maintainability, the damping force of the eddy current shock absorbers needs to be adjustable within a certain range.

[0005] In summary, there is an urgent need for a rotary eddy current vibration absorber with adjustable damping to solve the problems existing in the prior art. Summary of the invention

[0006] The present invention aims to provide a rotary eddy current damper with adjustable damping, aiming to solve the problem of adjusting the damping force of the eddy current damper. The specific technical solution is as follows:

[0007] A rotary eddy current damper with adjustable damping comprises a conductor cylinder, a rotating shaft, an outer cylinder, a screw, a screw nut and a permanent magnet group, wherein the screw nut is sleeved on the screw, the screw and the screw nut are both arranged inside the outer cylinder and the three are arranged coaxially, the screw nut is rotatably arranged on the inner wall of the outer cylinder through a second bearing, the rotating shaft is a hollow structure, the rotating shaft is sleeved on the outer periphery of the screw and the two are coaxial, one end of the rotating shaft is fixedly connected to the screw nut, the permanent magnet group comprises a plurality of permanent magnets, the plurality of permanent magnets are evenly arranged on the outer wall of the rotating shaft, a conductor cylinder is provided on the inner wall of the outer cylinder, and the conductor cylinder is arranged opposite to the permanent magnet.

[0008] Preferably in the above technical solution, a gap is left between the conductor cylinder and the permanent magnet, and the conductor cylinder and the permanent magnet rotate relative to each other.

[0009] Preferably in the above technical solution, the number of permanent magnets in the permanent magnet group is even, and the magnetization directions of adjacent permanent magnets are opposite; and the permanent magnet group is provided with multiple groups along the axial direction of the rotating shaft.

[0010] Preferably, the above technical solution further includes an adjusting nut, the conductor tube is fixedly connected to the adjusting nut, the outer periphery of the adjusting nut is provided with an external thread, the inner wall of the outer tube is provided with an internal thread, and the conductor tube is adjustably arranged on the inner wall of the outer tube through the adjusting nut.

[0011] Preferably in the above technical solution, a first bearing is also sleeved on the rotating shaft, and the rotating shaft is rotatably arranged on the inner wall of the outer cylinder through the first bearing; and the permanent magnet is arranged on a side of the first bearing away from the screw nut.

[0012] Preferably in the above technical solution, a guide member is provided on one end of the screw rod located inside the rotating shaft, and the guide member is in sliding contact with the inner wall of the rotating shaft.

[0013] Preferably in the above technical solution, the guide member includes a guide seat and a guide ring, the guide seat is sleeved on the end of the screw rod, the guide ring is sleeved on the outer periphery of the guide seat and the guide ring is in sliding contact with the inner wall of the rotating shaft.

[0014] Preferably in the above technical solution, an end of the outer cylinder where the second bearing is arranged is provided with an end cover, an end of the outer cylinder away from the end cover is provided with a first connecting piece, and an end of the screw rod away from the guide piece is provided with a second connecting piece.

[0015] Preferably in the above technical solution, a protective cover is further provided on the second connecting member, and the protective cover is sleeved on the outer circumference of the outer cylinder.

[0016] Preferably, in the above technical solution, the outer cylinder and the rotating shaft are made of magnetic conductive material, and the conductor cylinder is made of conductive material.

[0017] The application of the technical solution of the present invention has the following beneficial effects:

[0018] The present invention realizes the integration of an eddy current damper and a ball screw inertial device. The ball screw inertial device amplifies the inertial mass of the rotating shaft to provide an inertial force, generates a passive negative stiffness characteristic and can enhance the vibration reduction performance. The ball screw amplifies the eddy current damping force and improves the equivalent damping coefficient of the vibration absorber. The inner rotor and outer stator structure (the rotating shaft, the permanent magnet and the screw nut are the rotor, and the conductor cylinder and the outer cylinder are the stator) are adopted to enhance the use safety and heat dissipation capacity, and realize the electromagnetic shielding effect. The material of the outer cylinder and the rotating shaft is a magnetic conductive material, and the material of the conductor cylinder is a conductive material, which does not require a working fluid, has good temperature adaptability, high reliability, good durability and good maintainability. The conductor cylinder is adjusted in the axial direction of the outer cylinder by adjusting the nut, and then the mapping area of ​​the permanent magnet on the conductor cylinder is adjusted, so that the range adjustment of the eddy current damping force can be realized, which is conducive to realizing product serialization and modularization.

[0019] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment 1 of the present invention;

[0022] Among them, 1-first connecting piece, 2-guide seat, 3-guide ring, 4-adjusting nut, 5-conductor cylinder, 6-permanent magnet, 7-first bearing, 8-rotating shaft, 9-outer cylinder, 10-screw, 11-screw nut, 12-second bearing, 13-end cover, 14-protective cover, 15-second connecting piece. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0024] Embodiment 1:

[0025] See also Figure 1, a rotary eddy current damper with adjustable damping, characterized in that it includes a conductor cylinder 5, a rotating shaft 8, an outer cylinder 9, a screw 10, a screw nut 11 and a permanent magnet group, the screw nut 11 is sleeved on the screw 10, the screw 10 and the screw nut 11 are both arranged inside the outer cylinder 9 and the three are coaxially arranged, the screw nut 11 is rotatably arranged on the inner wall of the outer cylinder 9 through a second bearing 12, the rotating shaft 8 is a hollow structure, the rotating shaft 8 is sleeved on the outer periphery of the screw 10 and the two are coaxial, one end of the rotating shaft 8 is fixedly connected to the screw nut 11, the permanent magnet group includes a plurality of permanent magnets 6, and the plurality of permanent magnets 6 are evenly arranged on the outer wall of the rotating shaft 8, a conductor cylinder 5 is provided on the inner wall of the outer cylinder 9, and the conductor cylinder 5 and the permanent magnet 6 are arranged opposite to each other.

[0026] A gap is left between the conductor cylinder 5 and the permanent magnet 6 , and the conductor cylinder 5 and the permanent magnet 6 rotate relative to each other.

[0027] The number of permanent magnets 6 in the permanent magnet group is even, and the magnetization directions of adjacent permanent magnets are opposite; multiple groups of the permanent magnet group are arranged along the axial direction of the rotating shaft 8 .

[0028] The outer cylinder 9 and the rotating shaft 8 are made of magnetic conductive materials, preferably low-carbon steel, and the conductor cylinder 5 is made of conductive materials, preferably copper or aluminum alloy.

[0029] The damping adjustable rotary eddy current vibration absorber also includes an adjusting nut 4, the conductor tube 5 is fixedly connected to the adjusting nut 4, the outer periphery of the adjusting nut 4 is provided with an external thread, the inner wall of the outer tube 9 is provided with an internal thread, and the conductor tube 5 is adjustably arranged on the inner wall of the outer tube 9 through the adjusting nut 4; the position of the conductor tube in the axial direction of the outer tube is adjusted by the adjusting nut, thereby adjusting the relative area between the conductor tube and the permanent magnet, and further adjusting the damping force of the vibration absorber.

[0030] See also Figure 1 The damping adjustment process of the rotary eddy current vibration absorber with adjustable damping is as follows: during assembly, first assemble the conductor cylinder to the limit step on the outer cylinder, at this time the eddy current damping force reaches the maximum value; during the damping debugging process, the adjusting nut and the conductor cylinder are continuously moved downward by hand through a special wrench, at this time the eddy current damping force gradually decreases until the specified damping force is reached, and the adjusting nut is fixed.

[0031] The rotating shaft 8 is also sleeved with a first bearing 7, and the rotating shaft 8 is rotatably arranged on the inner wall of the outer cylinder 9 through the first bearing 7, see Figure 1The outer wall of the rotating shaft 8 is a stepped structure, and the inner wall of the outer cylinder 9 is also a stepped structure. The first bearing 7 is limited by the steps of the rotating shaft and the outer cylinder, thereby limiting the axial movement of the rotating shaft; preferably, the permanent magnet 6 is arranged on the side of the first bearing 7 away from the screw nut 11.

[0032] Preferably, in this embodiment, a guide member is provided on one end of the screw rod 10 located inside the rotating shaft 8 , and the guide member is in sliding contact with the inner wall of the rotating shaft 8 .

[0033] Specifically, the guide member includes a guide seat 2 and a guide ring 3 . The guide seat 2 is sleeved on the end of the screw rod 10 . The guide ring 3 is sleeved on the outer periphery of the guide seat 2 and the guide ring 3 is in sliding contact with the inner wall of the rotating shaft 8 .

[0034] An end cover 13 is provided at one end of the outer cylinder 9 where the second bearing 12 is arranged. A through hole is provided on the end cover, and the screw nut and the screw both pass through the through hole. The second bearing 12 is limited by the end cover, and the combined rotation and axial limitation of the rotating shaft and the screw nut are achieved through the cooperation of the first bearing and the second bearing; a first connecting member 1 is provided at one end of the outer cylinder 9 away from the end cover 13, and a second connecting member 15 is provided at one end of the screw 10 away from the guide member.

[0035] The second connecting member 15 is further provided with a protective cover 14 , and the protective cover 14 is sleeved on the outer circumference of the outer cylinder 9 .

[0036] The first connecting member 1 and the second connecting member 15 are metal-rubber assemblies, and the first connecting member and the second connecting member are used to connect the shock absorber to an external device, and the external device is generally a suspension system.

[0037] The working principle of the rotary eddy current vibration damper with adjustable damping in this embodiment is described as follows: the eddy current vibration damper is fixed to the suspension system through the first connecting member and the second connecting member, and the external vibration and impact drive the screw to perform axial reciprocating motion relative to the outer cylinder, and the screw drives the screw nut to make the rotating shaft and the permanent magnet thereon rotate relative to the conductor cylinder, forming an inertial mass effect.

[0038] According to the principle of electromagnetic induction, the conductor tube cuts the magnetic induction lines of the permanent magnet, thereby inducing eddy currents in the conductor tube; according to Lenz's law, the eddy current induced magnetic field hinders the relative movement of the conductor tube and the permanent magnet magnetic field, that is, eddy current damping is generated. The inertial mass and eddy current damping force can generate a large axial damping force after being amplified by the screw nut pair. At the same time, the induced eddy current in the conductor tube is a closed loop, and the vibration energy can be quickly converted into heat dissipation through the resistance effect of the conductor tube and the outer tube, achieving the purpose of energy consumption and vibration reduction.

[0039] Among them, the magnitude of the eddy current damping force is related to the rate of change of the magnetic flux in the conductor cylinder, and reaches its maximum value when the permanent magnet is in the middle position of the conductor cylinder; when the conductor cylinder moves axially toward the lower end by screwing the thread of the adjusting nut, the mapping area of ​​the permanent magnet on the conductor cylinder decreases, and the magnetic flux in the conductor cylinder and its rate of change will decrease, resulting in a decrease in the eddy current damping force, thereby achieving an adjustable range of the eddy current damping force.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotary eddy current vibration damper with adjustable damping, characterized in that: The invention comprises a conductor cylinder (5), a rotating shaft (8), an outer cylinder (9), a screw rod (10), a screw rod nut (11) and a permanent magnet group, wherein the screw rod nut (11) is sleeved on the screw rod (10), the screw rod (10) and the screw rod nut (11) are both arranged inside the outer cylinder (9) and the three are arranged coaxially, the screw rod nut (11) is rotatably arranged on the inner wall of the outer cylinder (9) through a second bearing (12), the rotating shaft (8) is a hollow structure, the rotating shaft (8) is sleeved on the outer periphery of the screw rod (10) and the two are coaxially arranged, one end of the rotating shaft (8) is fixedly connected to the screw rod nut (11), and the permanent magnet group comprises a plurality of permanent magnets (6), the plurality of permanent magnets (6) are evenly arranged on the outer wall of the rotating shaft (8), a conductor cylinder (5) is arranged on the inner wall of the outer cylinder (9), and the conductor cylinder (5) and the permanent magnet (6) are arranged opposite to each other; It also includes an adjusting nut (4), the conductor tube (5) is fixedly connected to the adjusting nut (4), the outer circumference of the adjusting nut (4) is provided with an external thread, the inner wall of the outer tube (9) is provided with an internal thread, and the conductor tube (5) is adjustably arranged on the inner wall of the outer tube (9) through the adjusting nut (4); The outer cylinder (9) and the rotating shaft (8) are made of magnetic conductive materials, and the conductor cylinder (5) is made of conductive materials.

2. The rotary eddy current vibration absorber with adjustable damping according to claim 1, characterized in that: A gap is left between the conductor cylinder (5) and the permanent magnet (6), and the conductor cylinder (5) and the permanent magnet (6) rotate relative to each other.

3. The rotary eddy current vibration absorber with adjustable damping according to claim 2, characterized in that: The number of permanent magnets (6) in the permanent magnet group is an even number, and the magnetization directions of adjacent permanent magnets are opposite; and a plurality of permanent magnet groups are provided along the axial direction of the rotating shaft (8).

4. The rotary eddy current vibration absorber with adjustable damping according to claim 3, characterized in that: The rotating shaft (8) is also sleeved with a first bearing (7), and the rotating shaft (8) is rotatably arranged on the inner wall of the outer cylinder (9) through the first bearing (7); the permanent magnet (6) is arranged on a side of the first bearing (7) away from the screw nut (11).

5. The rotary eddy current vibration absorber with adjustable damping according to claim 1, characterized in that: A guide piece is provided on one end of the screw rod (10) located inside the rotating shaft (8), and the guide piece is in sliding contact with the inner wall of the rotating shaft (8).

6. The rotary eddy current vibration absorber with adjustable damping according to claim 5, characterized in that: The guide member comprises a guide seat (2) and a guide ring (3); the guide seat (2) is sleeved on the end of the screw rod (10); the guide ring (3) is sleeved on the outer periphery of the guide seat (2) and the guide ring (3) is in sliding contact with the inner wall of the rotating shaft (8).

7. The rotary eddy current vibration absorber with adjustable damping according to claim 6, characterized in that: An end of the outer cylinder (9) on which the second bearing (12) is arranged is provided with an end cover (13), an end of the outer cylinder (9) away from the end cover (13) is provided with a first connecting member (1), and an end of the screw rod (10) away from the guide member is provided with a second connecting member (15).

8. The rotary eddy current vibration absorber with adjustable damping according to claim 7, characterized in that: The second connecting member (15) is also provided with a protective cover (14), and the protective cover (14) is sleeved on the outer circumference of the outer cylinder (9).

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