Inner and outer cylinder type magnetorheological damper adopting multi-magnetic-pole excitation

Abstract

The invention provides an inner-outer cylinder type magnetorheological damper adopting multi-magnetic-pole excitation. The inner-outer cylinder type magnetorheological damper comprises an inner cylinder, and the two ends of the inner cylinder are fixedly connected with a left end cover and a right end cover correspondingly; a plurality of through grooves are formed in the outer wall of the inner cylinder; the outer cylinder sleeves the outer wall of the inner cylinder; the left piston rod and the right piston rod are arranged in the inner cylinder, one end of the left piston rod penetrates through the left end cover, and one end of the right piston rod penetrates through the right end cover; the winding frame is arranged in the inner cylinder, the left piston rod and the right piston rod are sleeved with the two ends of the winding frame respectively, and the magnet exciting coils are evenly distributed on the winding frame and staggered with the axial liquid flow channels. The magnetic field can be guided to form a closed magnetic field loop at the axial liquid flow channel, the effective working length is increased, the output damping force of the damper is effectively improved, magnetic lines of force can be evenly distributed, and the problems of overall working efficiency reduction and local magnetic saturation are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of magnetorheological dampers, and in particular to an inner-outer-outer tube magnetorheological damper adopting multi-pole excitation. Background Art

[0002] Magnetorheological damper is a new type of intelligent damping device with magnetorheological fluid as the working medium. Magnetorheological damper developed based on magnetorheological effect has the advantages of simple structure, small size, low energy consumption and fast response. Due to its adjustable damping characteristics, it is widely used in vibration control fields such as automobile vibration reduction and prosthesis.

[0003] Traditional magnetorheological dampers usually design the piston into an I-shaped structure, and a single or multiple groups of excitation coils are wound on the coil groove in the middle area of ​​the piston, and a liquid flow channel is provided between the piston and the damper cylinder wall. When current is passed through the excitation coil, a magnetic field perpendicular to the direction of the liquid flow is formed at the liquid flow channel, and the magnetorheological fluid flowing through this channel produces a magnetorheological effect. By changing the magnitude of the excitation coil current and thus changing the magnetic induction intensity, variable damping adjustment is achieved. Since the coil groove occupies most of the axial length of the piston, the effective working length of the piston is small, which affects the output of the damping force. In order to increase the effective working length, a common method is to add a magnetic conductive ring and a magnetic isolation ring to the coil groove. Although this method can allow more liquid flow channels to be affected by the magnetic field, it will lead to uneven magnetic field distribution. The liquid flow channel close to the excitation coil will generate a strong magnetic field, while the liquid flow channel far away from the coil will have a weak magnetic field, resulting in a decrease in overall working efficiency and prone to local magnetic saturation. In addition, this design increases the complexity of the structure and is difficult to meet the actual application requirements under different working conditions.

[0004] In summary, in the prior art, the coil groove occupies most of the axial length of the piston, which makes the effective working length of the piston smaller, affecting the output of the damping force. The addition of magnetic conductive rings and magnetic isolation rings will cause uneven magnetic field distribution, thereby leading to a decrease in overall working efficiency and prone to local magnetic saturation. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide an inner-outer-tube magnetorheological damper using multi-pole excitation to solve the deficiencies in the above-mentioned prior art.

[0006] The present invention provides an inner-outer-outer tube type magnetorheological damper using multi-pole excitation, comprising: An inner cylinder, wherein the two ends of the inner cylinder are respectively fixedly connected with a left end cover and a right end cover, and a plurality of through grooves are arranged on the outer wall of the inner cylinder, and the through grooves are axial liquid flow channels; An outer cylinder is sleeved on the outer wall of the inner cylinder; The left piston rod and the right piston rod are both arranged inside the inner tube, one end of the left piston rod passes through the left end cover, and one end of the right piston rod passes through the right end cover; A winding frame is arranged inside the inner cylinder, and two ends of the winding frame are respectively sleeved on the left piston rod and the right piston rod; A plurality of excitation coils are evenly arranged on the winding frame, and the plurality of excitation coils and the plurality of axial liquid flow channels are staggered; Among them, several of the excitation coils are used to generate a magnetic field, and the magnetic field passes through several of the axial liquid flow channels and forms a closed magnetic field loop in the axial liquid flow channels to expand the coverage of the magnetic field along the axial direction and increase the working length of the damper.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: a plurality of axial liquid flow channels are arranged on the inner cylinder, and multiple excitation coils are adopted, which can guide the magnetic field to form a closed magnetic field loop at the axial liquid flow channel, thereby increasing the effective working length, thereby being able to effectively improve the output damping force of the damper without changing the outer dimensions, and the magnetic field starts from the winding frame and passes through the axial liquid flow channel on the inner cylinder back to the winding frame, which can guide the formation of a closed magnetic field loop, so that the magnetic lines of force in the axial liquid flow channel are evenly distributed, thereby avoiding the problems of decreased overall working efficiency and local magnetic saturation.

[0008] Furthermore, the left end cover and the right end cover are fixed to the two ends of the inner tube by screws respectively.

[0009] Furthermore, a sealing ring is provided between the left end cover and one end of the inner tube, and between the right end cover and the other end of the inner tube.

[0010] Furthermore, the left end cover is provided with a first through hole for passing through one end of the left piston rod, and the right end cover is provided with a second through hole for passing through one end of the right piston rod.

[0011] Furthermore, a left end cover of a piston head and a right end cover of a piston head are respectively provided at both ends of the winding frame. The left end cover of the piston head is arranged correspondingly to the left piston rod, and the right end cover of the piston head is arranged correspondingly to the right piston rod.

[0012] Furthermore, a plurality of baffles are evenly arranged on the winding frame, and the baffles are arranged alternately with the excitation coils.

[0013] Furthermore, an end cover is provided at one end of the outer cylinder close to the right piston rod.

[0014] Furthermore, the left piston rod and the right piston rod are of stepped structure.

[0015] Furthermore, the inner cylinder and the winding frame are both made of magnetic conductive materials.

[0016] Furthermore, the plurality of excitation coils are wound on the plurality of magnetic pole structures in a one-to-one correspondence, and the number of the plurality of excitation coils is an even number. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The cross-sectional view of the inner-outer tube type magnetorheological damper using multi-pole excitation in the embodiment of the present invention is shown in FIG. Figure 1 ; Figure 2 The cross-sectional view of the inner-outer tube type magnetorheological damper using multi-pole excitation in the embodiment of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a schematic diagram of the three-dimensional structure of the winding frame of the inner-outer-tube type magnetorheological damper using multi-pole excitation in an embodiment of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the piston head formed by assembling the winding frame, the left piston rod and the right piston rod of the inner-outer cylinder type magnetorheological damper adopting multi-pole excitation in an embodiment of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the inner cylinder of the inner-outer cylinder type magnetorheological damper adopting multi-pole excitation in an embodiment of the present invention; Figure 6 It is a two-dimensional cross-sectional view of the magnetic circuit structure of the inner-outer-cylinder type magnetorheological damper using multi-pole excitation in an embodiment of the present invention.

[0018] Description of main component symbols: 1. Left end cover; 2. Outer cylinder; 3. Inner cylinder; 32. Middle through hole; 4. Left piston rod; 5. Left end cover of piston head; 6. Winding frame; 7. Excitation coil; 8. Right end cover of piston head; 9. Right piston rod; 10. Right end cover; 11. End cover; 12. Baffle; 13. Pole structure; 301. Axial liquid flow channel.

[0019] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] See also Figures 1 to 6 , shown is an inner-outer cylinder type magnetorheological damper using multi-pole excitation in an embodiment of the present invention, including an inner cylinder 3, an axial liquid flow channel 301, an outer cylinder 2, a left piston rod 4, a right piston rod 9, a winding frame 6 and an excitation coil 7.

[0024] The two ends of the inner cylinder 3 are respectively fixedly connected with a left end cover 1 and a right end cover 10, a plurality of through grooves are evenly arranged on the outer wall of the inner cylinder 3, the through grooves are axial liquid flow channels 301, the axial liquid flow channels 301 and the excitation coils 7 are provided with a plurality of groups, an end cover 11 is provided at one end of the outer cylinder 2 close to the right piston rod 9, the left piston rod 4 and the right piston rod 9 are both arranged inside the inner cylinder 3, one end of the left piston rod 4 passes through the left end cover 1, and one end of the right piston rod 9 passes through the right end cover 10, the winding frame 6 is arranged inside the inner cylinder 3, the two ends of the winding frame 6 are respectively sleeved on the left piston rod 4 and the right piston rod 9, and a plurality of the excitation coils are evenly arranged. On the outer wall of the winding frame 6, a number of the excitation coils 7 are staggered with the number of the axial liquid flow channels 301, a number of baffles 12 are evenly arranged on the winding frame 6, and a number of the baffles 12 are staggered with the number of the excitation coils 7. The two ends of the winding frame 6 are respectively provided with a piston head left end cover 5 and a piston head right end cover 8, the piston head left end cover 5 is corresponding to the left piston rod 4, and the piston head right end cover 8 is corresponding to the right piston rod 9, wherein the number of the excitation coils 7 are used to generate a magnetic field, and the magnetic field passes through the number of the axial liquid flow channels 301 and forms a closed magnetic field loop in the axial liquid flow channel 301 to expand the coverage of the magnetic field along the axial direction and increase the working length of the damper.

[0025] It can be understood that the magnetic field starts from the winding frame 6, passes through the axial liquid flow channel 301 on the inner cylinder 3, and returns to the winding frame 6, thereby guiding the formation of a closed magnetic field loop, so that the magnetic lines of force of the axial liquid flow channel 301 are evenly distributed. In addition, by providing the axial liquid flow channel 301 on the inner cylinder 3 and using multiple excitation coils 7 to guide the magnetic field to form a closed magnetic field loop at the axial liquid flow channel 301, the effective working length is increased, and the output damping force of the damper can be effectively improved without changing the external dimensions.

[0026] It should be explained that the left piston rod 4 and the right piston rod 9 are stepped structures, and the outer circumferential surface of the left end of the left piston rod 4, that is, the end close to the left end cover 1, is processed with external threads. The left end cover 1 and the right end cover 10 are respectively fixed to the two ends of the inner cylinder 3 by screws (not shown in the figure), and a sealing ring (not shown in the figure) is provided between the left end cover 1 and one end of the inner cylinder 3 and between the right end cover 10 and the other end of the inner cylinder 3, and the left end cover 1 is provided with a first through hole (not shown in the figure) for passing through one end of the left piston rod 4, and the right end cover is provided with a second through hole (not shown in the figure) for passing through one end of the right piston rod 9, and the left piston rod 4 cooperates with the inner surface of the first through hole of the left end cover 1 and is sealed by a sealing ring (not shown in the figure).

[0027] In this embodiment, the left end cover 5 of the piston head is tightened and pressed with threads on the winding frame 6 through the left piston rod 4, and the right end cover 8 of the piston head is tightened and pressed with threads on the winding frame 6 through the right piston rod 9; the baffle 12 is pressed and fixed in the winding frame 6 by the left end cover 5 of the piston head and the right end cover 8 of the piston head, and cooperates with the inner surface of the inner cylinder 3; an axial liquid flow channel 301 is provided on the inner cylinder 3, which cooperates with the outer surface of the baffle 12 and the inner surface of the outer cylinder 2 to form an axial effective damping channel; the excitation coil 7 is evenly wound on the winding frame 6; the left end cover 1 and the right end cover 10 are provided with a central through hole, the left piston rod 4 passes through the central through hole of the left end cover 1, and the right piston rod 9 passes through the central through hole of the right end cover 10, so that the piston head is located in the inner cylinder 3; the sealed cavity formed by the left end cover 1, the right end cover 10, the inner cylinder 3, the left piston rod 4, the left end cover 5 of the piston head, the winding frame 6, the baffle 12, the right end cover 8 of the piston head, and the right piston rod 9 is filled with magnetorheological fluid; the inner cylinder 3, the right end cover 10, and the end cover 11 are fixedly connected in sequence by screws and sealed by a sealing ring; the winding frame 6 and the inner cylinder 3 are made of magnetic conductive material; the left end cover 1, the outer cylinder 2, the left piston rod 4, the left end cover 5 of the piston head, the right end cover 8 of the piston head, the right piston rod 9, the right end cover 10, the end cover 11, and the baffle 12 are made of non-magnetic conductive material.

[0028] It should be explained that the inner cylinder 3 and the winding frame 6 are both made of magnetic conductive materials, and the left end cover 1, the outer cylinder 2, the left piston rod 4, the left end cover 5 of the piston head, the right end cover 8 of the piston head, the right piston rod 9, the right end cover 10, the end cover 11 and the baffle 12 are made of non-magnetic conductive materials, which can reduce the magnetic leakage phenomenon of the magnetorheological damper, further increase the utilization rate of the magnetic field, and reduce the magnetic field loss at the damping gap.

[0029] In specific implementation, under external excitation, when the left piston rod 4 moves to the right, the piston head, that is, the left end cover 5 of the piston head, the winding frame 6, the excitation coil 7, the baffle 12, the right end cover 8 of the piston head and the right piston rod 9 move to the right, and the magnetorheological fluid flows through the axial liquid flow channel 301 on the inner cylinder 3 and flows from the right chamber of the inner cylinder 3 to the left chamber; when current is passed through the excitation coil 7, the winding frame 6 and the axial liquid flow channel 301 of the inner cylinder 3 form a closed magnetic field loop, and a magnetic field perpendicular to the direction of the liquid flow is formed in the axial liquid flow channel. The magnetorheological fluid flowing through the liquid flow channel produces a magnetorheological effect, and the shear stress increases, which hinders the magnetorheological fluid from flowing through the liquid flow channel, achieving a damping and vibration reduction effect. Changing the current in the excitation coil can change the output damping force.

[0030] Please refer to Figure 2 The winding frame 6 includes an even number of magnetic pole structures 13, which are evenly arranged in the circumferential direction in the hollow area of ​​the inner cylinder 3; the inner cylinder 3 is provided with an axial liquid flow channel 301, which cooperates with the baffle 12 and the outer cylinder 2 to form an effective damping channel; the axial liquid flow channel 301 of the inner cylinder 3 and the even number of magnetic pole structures 13 of the winding frame 6 are staggered.

[0031] Please refer to Figure 3 The winding frame 6 is processed into a multi-pole structure 13, and the number of magnetic poles is a symmetrical even number; grooves (not shown in the figure) are opened at both ends of the multi-pole structure 13 of the winding frame 6, and the excitation coil 7 is evenly wound on the grooves of the multi-pole structure of the winding frame 6.

[0032] Please refer to Figure 5 The inner cylinder 3 is processed with multiple groups of axial liquid flow channels 301 along the radial direction. The symmetry axis of the middle through hole 32 of each group of axial liquid flow channels 301 is distributed on the inner cylinder 3 of the damper at an angle of 90 degrees, and the remaining axial liquid flow channels 301 are symmetrically distributed about the middle through hole 32.

[0033] Please refer to Figure 6The winding frame 6 adopts a multi-pole structure 13, and the magnetic field generated by the excitation coil 7 starts from the winding frame 6, passes through the axial liquid flow channel 301 of the inner cylinder 3, and returns to the winding frame 6 to form a closed loop. Since the number of magnetic pole structures 13 is a symmetrical even number, and the excitation coils 7 of adjacent magnetic pole structures 13 have opposite current directions, the magnetic fields are superimposed on each other, thereby improving the overall magnetic field effect. The winding frame 6 of the present invention adopts a multi-pole structure 13, which can form multiple closed loops as described above.

[0034] In the specific implementation, an axial liquid flow channel 301 is provided on the inner cylinder, and a multi-pole structure 13 is adopted. Under external excitation, the left piston rod 4, the winding frame 6 and the right piston rod 9 move, pushing the magnetorheological fluid to flow through the axial liquid flow channel 301 on the inner cylinder 3. When current is passed through the excitation coil 7, a closed magnetic field loop is formed in the winding frame 6, the inner cylinder 3, and the axial liquid flow channel 301. A magnetic field perpendicular to the liquid flow direction is formed in the axial liquid flow channel 301. The magnetorheological fluid flowing through the liquid flow channel produces a magnetorheological effect, and the shear stress increases, which hinders the magnetorheological fluid from flowing through the liquid flow channel, thereby achieving a damping and vibration reduction effect. Changing the current in the excitation coil can change the output damping force.

[0035] In summary, in the inner-outer-cylinder type magnetorheological damper with multi-pole excitation in the above-mentioned embodiments of the present invention, a plurality of axial liquid flow channels 301 are arranged on the inner cylinder 3, and a multi-excitation coil 7 is adopted. The magnetic field starts from the winding frame 6 and passes through the axial liquid flow channel 301 on the inner cylinder 3 and returns to the winding frame 6, which can guide the formation of a closed magnetic field loop, so that the magnetic lines of force in the axial liquid flow channel 301 are evenly distributed, avoiding the problems of overall work efficiency reduction and local magnetic saturation, and the inner-outer-cylinder type magnetorheological damper with multi-pole excitation of the present invention has a compact structure and occupies a small space.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", 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 any one or more embodiments or examples in a suitable manner.

[0037] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An inner-outer tube type magnetorheological damper using multi-pole excitation, characterized in that: include: An inner cylinder, wherein the two ends of the inner cylinder are respectively fixedly connected with a left end cover and a right end cover, and a plurality of through grooves are arranged on the outer wall of the inner cylinder, and the through grooves are axial liquid flow channels; An outer cylinder is sleeved on the outer wall of the inner cylinder; The left piston rod and the right piston rod are both arranged inside the inner tube, one end of the left piston rod passes through the left end cover, and one end of the right piston rod passes through the right end cover; A winding frame is arranged inside the inner cylinder, and two ends of the winding frame are respectively sleeved on the left piston rod and the right piston rod; A plurality of excitation coils are evenly arranged on the winding frame, and the plurality of excitation coils and the plurality of axial liquid flow channels are staggered; Among them, several of the excitation coils are used to generate a magnetic field, and the magnetic field passes through several of the axial liquid flow channels and forms a closed magnetic field loop in the axial liquid flow channels to expand the coverage of the magnetic field along the axial direction and increase the working length of the damper.

2. The inner-outer tube type magnetorheological damper using multi-pole excitation according to claim 1 is characterized in that: The left end cover and the right end cover are respectively fixed to the two ends of the inner cylinder by screws.

3. The inner-outer tube type magnetorheological damper using multi-pole excitation according to claim 1 is characterized in that: A sealing ring is provided between the left end cover and one end of the inner tube, and between the right end cover and the other end of the inner tube.

4. The inner-outer tube type magnetorheological damper using multi-pole excitation according to claim 1 is characterized in that: The left end cover is provided with a first through hole for passing through one end of the left piston rod, and the right end cover is provided with a second through hole for passing through one end of the right piston rod.

5. The inner-outer tube type magnetorheological damper using multi-pole excitation according to claim 1 is characterized in that: The two ends of the winding frame are respectively provided with a piston head left end cover and a piston head right end cover, the piston head left end cover is arranged corresponding to the left piston rod, and the piston head right end cover is arranged corresponding to the right piston rod.

6. The inner-outer-outer tube type magnetorheological damper using multi-pole excitation according to claim 1 is characterized in that: A plurality of baffles are evenly arranged on the winding frame, and the baffles are arranged alternately with the excitation coils.

7. The inner-outer tube type magnetorheological damper using multi-pole excitation according to claim 1 is characterized in that: An end cover is provided at one end of the outer cylinder close to the right piston rod.

8. The inner-outer tube type magnetorheological damper using multi-pole excitation according to claim 1 is characterized in that: The left piston rod and the right piston rod are of stepped structure.

9. The inner-outer tube type magnetorheological damper using multi-pole excitation according to claim 1 is characterized in that: The inner cylinder and the winding frame are both made of magnetic conductive materials.

10. The inner-outer tube type magnetorheological damper using multi-pole excitation according to claim 1, characterized in that: The plurality of excitation coils are wound on the plurality of magnetic pole structures in a one-to-one correspondence, and the number of the plurality of excitation coils is an even number.

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