Magneto-rheological brake with high-strength magnetic field

Abstract

The invention relates to the technical field of brakes, in particular to a magneto-rheological brake with a high-strength magnetic field, and mainly solves the technical problem that an existing magneto-rheological brake is small in braking torque. According to the magneto-rheological brake, the magnet exciting coil is arranged on the periphery of the brake disc, the two electromagnetic assemblies are arranged on the two axial sides of the brake disc, the two electromagnets are oppositely arranged in the axial direction, the polarities of the two opposite electrodes are opposite, each electromagnet is provided with an even number of electromagnets evenly distributed in the circumferential direction, and the polarities of the two adjacent electrodes are opposite. In this way, each electromagnet pair and the adjacent electromagnet pair form a closed magnetic circuit, the closed magnetic circuit perpendicularly penetrates through the magnetorheological channel twice, the magnetic field utilization rate is high, the magnetic field intensity can be greatly improved, then the braking torque is increased, and the magnetorheological brake can be suitable for high-speed or large-load scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of brakes, and particularly to a magnetorheological brake with a high-strength magnetic field. Background Art

[0002] Traditional friction brakes generate braking effects by using brake fluid to push brake pads against brake discs to produce frictional forces. Such brakes cannot achieve rapid and precise braking, and wear and noise are also generated during the braking process. Moreover, frictional wear will gradually reduce the braking performance of the brakes. Due to this technical defect, magnetorheological brakes have emerged.

[0003] A magnetorheological brake is a device that uses the magnetorheological effect to generate braking effects. Its core structure includes a magnetic field generating device and magnetorheological fluid filled between the brake pads and the brake disc. During braking, the magnetic field generating device generates a magnetic field and acts on the magnetorheological fluid. The magnetic particles in the magnetorheological fluid will arrange into a chain-like structure under the action of the magnetic field, causing the viscosity of the magnetorheological fluid to increase rapidly, thereby hindering the movement of the brake disc and generating a braking effect. When the magnetic field disappears, the magnetorheological fluid returns to its original liquid state, and the braking effect disappears accordingly. Moreover, the viscosity of the magnetorheological fluid increases with the increase of the magnetic field. By controlling the magnitude of the magnetic field intensity, the magnitude of the braking force can be precisely adjusted. Therefore, magnetorheological brakes have the advantages of rapid response time, precise control, low noise, and less friction and wear.

[0004] In existing magnetorheological brakes, an excitation coil is generally coaxially arranged around the brake disc. This excitation coil serves as the magnetic field generating device to generate a magnetic field acting on the magnetorheological fluid to achieve braking. The magnetic field intensity of this structure completely depends on the excitation coil, and the magnetic field intensity that can be generated is limited. Moreover, the magnetic flux lines cannot form a closed magnetic circuit, resulting in a large magnetic field loss. Eventually, the braking torque is small, making it difficult to be applicable to scenarios with high speeds or large loads. Summary of the Invention

[0005] To overcome the technical defect of the small braking torque existing in existing magnetorheological brakes, the present invention provides a magnetorheological brake with a high-strength magnetic field.

[0006] The magnetorheological brake with a high-strength magnetic field provided by the present invention includes: A rotating shaft; A brake disc, which is sleeved on the rotating shaft and rotates integrally with the rotating shaft; A housing assembly, which is rotatably sleeved on the rotating shaft and is rotationally sealed with the rotating shaft. The housing assembly forms a first annular cavity coaxially arranged around the brake disc and two second annular cavities respectively located on both axial sides of the brake disc. A magnetorheological channel is formed between the housing assembly and the brake disc, and the magnetorheological channel is filled with magnetorheological fluid; The exciting coil is wound within the first annular cavity and coaxial with the brake disc; The electromagnetic assembly includes two sets of electromagnets respectively located within two second annular cavities. The two sets of electromagnets are arranged axially opposite to each other, and the opposite two electrodes have opposite polarities. Each set of electromagnets is provided with an even number of electrodes evenly distributed circumferentially, and the adjacent two electrodes have opposite polarities.

[0007] Optionally, the brake disc includes a cylindrical portion sleeved on the rotating shaft and a disc-shaped portion provided at the middle of the outer circumferential surface of the cylindrical portion. The two second annular cavities are respectively located on both sides of the disc-shaped portion.

[0008] Optionally, the brake disc further includes a toothed portion provided on the outer circumferential surface of the disc-shaped portion. The axial length of the toothed portion is greater than that of the disc-shaped portion. A plurality of tooth rings are integrally formed on the inner side of the inner circumferential wall of the first annular cavity. The tooth rings are placed in the tooth gaps of the toothed portion, and a gap is reserved between the inner circumferential wall of the first annular cavity and the toothed portion.

[0009] Optionally, the inner circumferential wall of the first annular cavity is further provided with a cooling channel arranged along the gap. The cooling channel is adjacent to the magnetorheological fluid and extends to the outside at both ends to circulate and cool the magnetorheological fluid.

[0010] Optionally, a first cooling ring plate is further provided on the outer side of the inner circumferential wall of the first annular cavity. The exciting coil is wound on the first cooling ring plate. The first cooling ring plate is provided with a first cooling cavity, and the first cooling cavity is provided with an inlet and an outlet both communicating with the outside to circulate and cool the exciting coil.

[0011] Optionally, the electromagnet includes an iron core and a magnet coil. An annular groove is formed on the outer circumferential surface of the iron core, and the magnet coil is wound within the annular groove.

[0012] Optionally, the electromagnet further includes a second cooling ring plate. The second cooling ring plate is fixedly sleeved on the iron core and covers the outside of the magnet coil. The second cooling ring plate is provided with a second cooling cavity, and the second cooling cavity is provided with an inlet and an outlet both communicating with the outside to circulate and cool the magnet coil.

[0013] Optionally, the housing assembly includes: Two boxes are provided and symmetrically distributed on both sides of the rotating disc. The boxes are rotatably sleeved on the rotating shaft and are rotationally sealed with the rotating shaft. The second annular cavity is formed within the boxes; Two covers are provided and respectively fixed on one side of the two boxes away from the brake disc. The covers extend radially outward from the boxes and form an annular mounting portion; A cylindrical shell is connected between the two annular mounting portions to serve as the outer circumferential wall of the first annular cavity; A spacer cylinder, which is connected between two annular mounting parts and arranged at intervals inside the cylinder shell to serve as the inner ring wall of the first annular cavity.

[0014] Optionally, the rotating shaft includes a large-diameter shaft section and small-diameter shaft sections located on both sides of the large-diameter shaft section. The brake disc is sleeved on the large-diameter shaft section, and both the box body and the cover plate are rotatably sleeved on the small-diameter shaft sections through bearings. The housing assembly further includes retaining rings. There are two retaining rings, which are respectively fixed on the sides of the two cover plates away from the box body. One end of the bearing abuts against the retaining ring and the other end abuts against the shoulder formed by the large-diameter shaft section and the small-diameter shaft section.

[0015] Optionally, a part of the inner circular surface of the box body in the axial direction is fixedly sleeved on the outer ring of the bearing and another part is rotatably sleeved on the large-diameter shaft section through a sealing ring.

[0016] The technical solution provided by the present invention has the following advantages compared with the prior art: The magnetorheological brake with a high-intensity magnetic field provided by the present invention not only has an excitation coil arranged around the brake disc, but also has two sets of electromagnetic components arranged on both axial sides of the brake disc. The two sets of electromagnets are arranged opposite to each other in the axial direction and the opposite two electrode polarities are opposite. Each set of electromagnets has an even number of electrodes evenly distributed in the circumferential direction and the adjacent two electrode polarities are opposite. In this way, each pair of electromagnets forms a closed magnetic circuit with the adjacent pair of electromagnets, and the closed magnetic circuit vertically penetrates the magnetorheological channel twice, with a relatively high magnetic field utilization rate. Thus, the magnetic field intensity can be greatly improved, and further the braking torque can be increased, so that the present magnetorheological brake can be applicable to high-speed or large-load scenarios. Description of the Drawings

[0017] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments conforming to the present invention and used together with the specification to explain the principles of the present invention.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0019] Figure 1 Showing a cross-sectional view of the magnetorheological brake in the embodiment of the present invention; Figure 2 Showing a cross-sectional view of the rotating shaft and its attached components in the embodiment of the present invention; Figure 3 Showing a cross-sectional view of the brake disc in the embodiment of the present invention; Figure 4Shows a cross-sectional view of the housing assembly in an embodiment of the present invention; Figure 5 Indicates Figure 4 A partial enlarged view at location A in Figure 6 Shows a cross-sectional view of the electromagnet in an embodiment of the present invention.

[0020] In the figure: 1. Rotating shaft; 11. Large-diameter shaft section; 12. Small-diameter shaft section; 13. Bearing; 14. Sealing ring; 15. Key; 2. Brake disc; 21. Cylindrical part; 22. Disc-shaped part; 23. Tooth-shaped part; 3. Housing assembly; 31. First annular cavity; 32. Second annular cavity; 33. Magnetorheological channel; 34. Box body; 35. Cover plate; 351. Annular mounting part; 36. Cylindrical shell; 37. Partition cylinder; 371. Tooth ring; 372. Cooling channel; 38. Retaining ring; 39. First cooling ring plate; 391. First cooling cavity; 4. Excitation coil; 5. Electromagnetic assembly; 51. Electromagnet; 511. Iron core; 512. Magnet coil; 513. Annular groove; 514. Second cooling ring plate; 515. Second cooling cavity; 6. First bolt; 7. Second bolt; 8. Third bolt; 9. Exhaust hole. Detailed implementation manners

[0021] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the solution of the present invention will be further described below. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0023] Many specific details are set forth in the following description in order to provide a thorough understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all the embodiments.

[0024] The following combines Figures 1 to 6 To describe in detail the specific embodiments of the present invention.

[0025] This embodiment provides a magnetorheological brake with a high-intensity magnetic field. Refer to Figure 1 , which includes a rotating shaft 1, a brake disc 2, a housing assembly 3, an exciting coil 4, and an electromagnetic assembly 5.

[0026] Among them, refer to Figure 1 and Figure 2 , the rotating shaft 1 is the main body to be braked of the magnetorheological brake. During use, it is generally connected to a load to achieve the braking of the load.

[0027] Specifically, the rotating shaft 1 includes a large-diameter shaft section 11 and small-diameter shaft sections 12 located on both sides of the large-diameter shaft section 11. The rotating shaft 1 is designed as a stepped shaft mainly to facilitate the axial positioning of the housing assembly 3, which will be described in detail later in combination with the structure of the housing assembly 3.

[0028] Among them, refer to Figure 1 and Figure 3 , the brake disc 2 is sleeved on the rotating shaft 1 and rotates integrally with the rotating shaft 1.

[0029] Specifically, the brake disc 2 can be press-fitted on the rotating shaft 1, or sleeved on the rotating shaft 1 with a clearance and achieve circumferential positioning through positioning structures such as a key 15. For example, Figure 1 shown in

[0030] It should be noted that Figure 1 the length of the key 15 shown in

[0031] is less than the axial length of the brake disc 2. The brake disc 2 adopts a split structure of two semi-circles to facilitate the installation of the key 15. The purpose of this setting is to enable the key 15 to not only have the function of circumferential limit but also have a certain axial limit function, thereby improving the stability of the brake disc 2 relative to the rotating shaft 1.

[0032] Among them, refer to Figure 1 , Figure 4 and Figure 5 , the housing assembly 3 is rotatably sleeved on the rotating shaft 1 and is rotationally sealed with the rotating shaft 1. The housing assembly 3 forms a first annular cavity 31 coaxially arranged around the brake disc 2 and two second annular cavities 32 respectively located on both axial sides of the brake disc 2. A magnetorheological channel 33 is formed between the housing assembly 3 and the brake disc 2, and the magnetorheological channel 33 is filled with magnetorheological fluid.

[0033] It is easy to understand that a magnetorheological channel 33 is formed between the housing assembly 3 and the brake disc 2, that is, the space formed between the brake disc 2 and the inner ring wall of the first annular cavity 31 and the two end walls of the two second annular cavities 32 opposite thereto. Of course, as Figure 1 shown, if there is a gap between the second annular cavity 32 and the first annular cavity 31 and / or the rotating shaft 1 in the radial direction, the space formed between the brake disc 2 and the inner wall of the housing assembly 3 corresponding to the gap should also be added.

[0034] Specifically, the housing assembly 3 includes a box body 34, a cover plate 35, a cylinder shell 36 and a partition cylinder 37; there are two box bodies 34 which are symmetrically distributed on both sides of the rotating disc. The box body 34 is rotatably sleeved on the rotating shaft 1 and is rotationally sealed with the rotating shaft 1. A second annular cavity 32 is formed inside the box body 34; there are two cover plates 35 which are respectively fixed on the sides of the two box bodies 34 away from the brake disc 2. The cover plate 35 extends radially outward from the box body 34 and forms an annular mounting portion 351; the cylinder shell 36 is connected between the two annular mounting portions 351 to serve as the outer ring wall of the first annular cavity 31; the partition cylinder 37 is connected between the two annular mounting portions 351 and is arranged inside the cylinder shell 36 at intervals to serve as the inner ring wall of the first annular cavity 31. The housing assembly 3 adopts an assembled structure of the box body 34, the cover plate 35, the cylinder shell 36 and the partition cylinder 37, which is more conducive to the installation and maintenance of each component.

[0035] More specifically, the brake disc 2 is sleeved on the large-diameter shaft section 11 of the rotating shaft 1. Both the box body 34 and the cover plate 35 are rotatably sleeved on the small-diameter shaft section 12 of the rotating shaft 1 through bearings 13. The housing assembly 3 further includes retaining rings 38. There are two retaining rings 38 which are respectively fixed on the sides of the two cover plates 35 away from the box body 34. One end of the bearing 13 abuts against the retaining ring 38 and the other end abuts against the shoulder formed by the large-diameter shaft section 11 and the small-diameter shaft section 12. Both the box body 34 and the cover plate 35 are rotatably sleeved on the rotating shaft 1 through bearings 13, which is more conducive to ensuring the rotational stability of the rotating shaft 1 and the brake disc 2. And the bearing 13 is limited between the retaining ring 38 and the shoulder, which is more conducive to maintaining the axial stability of the overall structure and avoiding axial movement.

[0036] In detail, a part of the inner circular surface of the box body 34 in the axial direction is fixedly sleeved on the outer ring of the bearing 13 and the other part is rotatably sleeved on the large-diameter shaft section 11 through a sealing ring 14. A sealing ring 14 is arranged between the box body 34 and the large-diameter shaft section 11 to achieve the rotational seal between the housing assembly 3 and the rotating shaft 1. Of course, the rotational seal between the housing assembly 3 and the rotating shaft 1 can also be achieved through a labyrinth structure or the like.

[0037] In detail, the connection of the box body 34, the cover plate 35, the partition cylinder 37, the cylinder shell 36 and the retaining ring 38 is preferably in a detachable manner for easy maintenance. For example Figure 1As shown, the cover plate 35 and the spacer cylinder 37 are fixed by the first bolt 6, the box body 34, the cover plate 35 and the retaining ring 38 are fixed by the second bolt 7, and the cover plate 35 and the cylinder shell 36 are fixed by the third bolt 8.

[0038] It should be noted that the box body 34 should be designed as a splicing structure of a main body and a cover body or other forms to successfully install the electromagnet 51, which is easy for those skilled in the art to design. In this embodiment, the main body and the cover body are fixed by welding to form the box body 34, and the weld seam is polished and removed by mechanical means to avoid interfering with the magnetorheological channels 33 on both sides of the brake disc 2.

[0039] Furthermore, exhaust holes 9 can be provided on the cylinder shell 36, the box body 34 and the cover plate 35 to communicate the first annular cavity 31 and the second annular cavity 32 with the outside, so that the exciting coil 4 placed in the first annular cavity 31 and the electromagnet 51 placed in the second annular cavity 32 can be cooled by air cooling.

[0040] Specifically, the two second annular cavities 32 are respectively located on both sides of the disc-shaped portion 22 of the brake disc 2, that is, the two box bodies 34 are located on both sides of the disc-shaped portion 22. The brake disc 2 is provided with a cylindrical portion 21 and a disc-shaped portion 22: on the one hand, it can ensure the mating area between the brake disc 2 and the rotating shaft 1, thus ensuring the firmness of the assembly of the brake disc 2 and the rotating shaft 1; on the other hand, it can reduce the distance between the two second annular cavities 32, which is beneficial to the penetration of magnetic lines of force, and at the same time can also reduce the volume of the device.

[0041] Specifically, a toothed ring 371 is integrated on the inner side of the inner ring wall of the first annular cavity 31 (i.e., the inner side of the spacer cylinder 37), the toothed ring 371 is placed in the tooth gap of the toothed portion 23 of the brake disc 2, and a gap is reserved between the inner ring wall of the first annular cavity 31 and the toothed portion 23. The cooperation between the toothed ring 371 and the toothed portion 23 can increase the number of radial magnetorheological channels 33 through which the magnetic field passes vertically, which is equivalent to increasing the effective damping length of the magnetic field passing vertically through the magnetorheological channels 33, thereby further improving the braking torque.

[0042] It is easy to understand that the so-called "integration" means that the toothed ring 371 belongs to a part of the inner ring wall of the first annular cavity 31. Therefore, the space between the inner ring wall of the first annular cavity 31 and the toothed portion 23 includes both the space between the toothed ring 371 and the tooth gap of the toothed portion 23 and the space between the part of the inner ring wall of the first annular cavity 31 located between the toothed rings 371 and the teeth of the toothed portion 23.

[0043] It should be noted that the spacer cylinder 37 with the toothed ring 371 should be designed as a structure of two halves spliced together to be able to be smoothly inserted into the toothed portion 23, which is easy for those skilled in the art to design.

[0044] Furthermore, the inner wall of the first annular cavity 31 (i.e., the partition cylinder 37 provided with the toothed ring 371) is also provided with cooling channels 372 arranged along the gap. The cooling channels 372 are arranged adjacent to the magnetorheological fluid and extend to the outside at both ends to circulate and cool the magnetorheological fluid. During use, one end of the cooling channel 372 is designed as the liquid inlet, and the other end is designed as the liquid outlet. The low-temperature liquid enters the cooling channel 372 from the liquid inlet, then exchanges heat with the high-temperature magnetorheological fluid, and finally discharges the heat of the magnetorheological fluid from the liquid outlet. In this way, the circulation cooling of the magnetorheological fluid is realized by means of external structures such as condensers.

[0045] It is easy to understand that the so-called "adjacent" needs to meet the wall thickness design requirements of the cooling channel 372 and can effectively cool the magnetorheological fluid, which is easy for those skilled in the art to design.

[0046] Specifically, a first cooling ring plate 39 is further provided on the outer side of the inner wall of the first annular cavity 31 (i.e., the outer side of the partition cylinder 37). The exciting coil 4 is wound around the first cooling ring plate 39. The first cooling ring plate 39 is provided with a first cooling cavity 391, and the first cooling cavity 391 is provided with an inlet and an outlet both communicating with the outside to circulate and cool the exciting coil 4. During use, the low-temperature liquid enters the first cooling cavity 391 from the inlet, then exchanges heat with the high-temperature exciting coil 4, and finally discharges the heat of the exciting coil 4 from the outlet. In this way, the circulation cooling of the exciting coil 4 is realized by means of external structures such as condensers.

[0047] Among them, referring to Figure 1 , the exciting coil 4 is wound in the first annular cavity 31 and is coaxial with the brake disc 2.

[0048] Specifically, the exciting coil 4 is wound around the first cooling ring plate 39 to improve the heat dissipation efficiency.

[0049] It should be noted that the exciting coil 4, as the main magnetic field generating device, can generate a large number of magnetic force lines parallel to the rotating shaft 1 and provide the main magnetic field intensity for the magnetorheological fluid.

[0050] Among them, referring to Figure 1 and Figure 6 , the electromagnetic assembly 5 includes two sets of electromagnets 51 respectively located in two second annular cavities 32. The two sets of electromagnets 51 are arranged axially opposite to each other and the opposite two electrodes have opposite polarities. Each set of electromagnets 51 is provided with an even number of electrodes evenly distributed circumferentially and the adjacent two electrodes have opposite polarities.

[0051] It is easy to understand that the layout of the above electromagnets 51 and the distribution of the electrode polarities make each pair of electromagnets 51 form a closed magnetic circuit with the adjacent pair of electromagnets 51, and the closed magnetic circuit vertically penetrates the magnetorheological channel 33 twice, with a high magnetic field utilization rate.

[0052] It should be noted that the electromagnetic component 5, as an auxiliary generating device of the magnetic field, has a high magnetic field utilization rate, can generate more magnetic lines parallel to the rotating shaft 1, and provide auxiliary magnetic field strength for the magnetorheological fluid. The excitation coil 4 and the electromagnetic component 5 are superimposed to form a high-intensity magnetic field of the device.

[0053] Specifically, the electromagnet 51 includes an iron core 511 and a magnetic coil 512. An annular groove 513 is provided on the outer circumferential surface of the iron core 511, and the magnetic coil 512 is wound in the annular groove 513. The provision of the annular groove 513 facilitates the winding of the magnetic coil 512 and can effectively prevent the magnetic coil 512 from falling off.

[0054] Furthermore, the electromagnet 51 also includes a second cooling ring plate 514, which is fixedly sleeved on the iron core 511 and covers the outer side of the magnetic coil 512. The second cooling ring plate 514 is provided with a second cooling cavity 515, and the second cooling cavity 515 is provided with an inlet and an outlet both connected to the outside to circulate and cool the magnetic coil 512. When in use, the low-temperature liquid enters the second cooling cavity 515 from the inlet, and then exchanges heat with the high-temperature magnetic coil 512, and finally carries the original heat of the magnetic coil 512 and is discharged from the outlet, so that the circulated cooling of the magnetic coil 512 is achieved with the help of external structures such as a condenser.

[0055] The assembly process of the magnetorheological brake with high magnetic field in this embodiment is as follows: S1. The brake disc 2 is installed by means of splicing on the large diameter shaft section 11 of the rotating shaft 1, and is limited by the key 15; S2. The spacer 37 with the gear ring 371 is sleeved on the periphery of the brake disc 2 by means of splicing; S3. The sealing ring 14 (eg, 1 mm) is arranged at intervals on one side of the brake disc 2, so that the sealing ring 14 is sleeved on the large diameter shaft section 11 of the rotating shaft 1 with an interference fit; S4. An electromagnet 51 is installed in the box 34 on one side; S4. The housing 34 on one side is sleeved on the outer ring of the bearing 13 by interference fit, and then the combined structure of the housing 34 and the bearing 13 is sleeved on the shaft 1, so that the inner ring of the bearing 13 is sleeved on the small diameter shaft section 12 of the shaft 1 by interference fit and positioned by the shaft shoulder, and at the same time, the inner circumferential surface of the housing 34 abuts against the sealing ring 14; S5. The cover plate 35 on one side is sleeved on the outer ring of the bearing 13, and the cover plate 35 is fixedly connected to the spacer 37 by a first bolt 6; S6. The retaining ring 38 on one side is sleeved on the rotating shaft 1 with a gap, and the retaining ring 38, the cover plate 35 and the housing 34 are fixedly connected by the second bolt 7, and the retaining ring 38 axially limits the outer ring of the bearing 13; S7. The first cooling ring plate 39 is sleeved on the periphery of the partition 37; S8. Wind the excitation coil 4 around the outside of the first cooling ring plate 39; S9. Place the cylinder shell 36 around the excitation coil 4 and fixedly connect it to the cover plate 35 through the third bolt 8; S10. Repeat steps S3 to S6 to install the sealing ring 14, the electromagnet 51, the box body 34, the bearing 13, the cover plate 35 and the retaining ring 38 on the other side of the brake disc 2.

[0056] The magnetorheological brake with high-intensity magnetic field in this embodiment is widely applicable to fields such as industrial automation, transportation, and mechanical control, and has high market application prospects and economic benefits.

[0057] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Although the above embodiments have been described in detail, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the above embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A magnetorheological brake with a high-intensity magnetic field, characterized in that, Comprising: A rotating shaft (1); A brake disc (2), which is sleeved on the rotating shaft (1) and rotates integrally with the rotating shaft (1); A housing assembly (3), which is rotatably sleeved on the rotating shaft (1) and is rotationally sealed with the rotating shaft (1). The housing assembly (3) forms a first annular cavity (31) coaxially arranged around the brake disc (2) and two second annular cavities (32) respectively located on both axial sides of the brake disc (2). A magnetorheological channel (33) is formed between the housing assembly (3) and the brake disc (2), and the magnetorheological channel (33) is filled with magnetorheological fluid; An exciting coil (4), which is wound in the first annular cavity (31) and is coaxial with the brake disc (2); An electromagnetic assembly (5), which includes two sets of electromagnets (51) respectively located in the two second annular cavities (32). The two sets of electromagnets (51) are arranged axially opposite to each other and the opposite two electrodes have opposite polarities. Each set of electromagnets (51) is provided with an even number of electrodes circumferentially distributed and the adjacent two electrodes have opposite polarities.

2. The magnetorheological brake with a high-intensity magnetic field according to claim 1, characterized in that, The brake disc (2) includes a cylindrical portion (21) sleeved on the rotating shaft (1) and a disc-shaped portion (22) provided in the middle of the outer circular surface of the cylindrical portion (21). The two second annular cavities (32) are respectively located on both sides of the disc-shaped portion (22).

3. The magnetorheological brake with a high-intensity magnetic field according to claim 2, wherein The brake disc (2) further includes a toothed portion (23) provided on the outer circular surface of the disc-shaped portion (22). The axial length of the toothed portion (23) is greater than that of the disc-shaped portion (22). A plurality of toothed rings (371) are integrally formed on the inner side of the inner ring wall of the first annular cavity (31). The toothed rings (371) are placed in the tooth gaps of the toothed portion (23), and a gap is reserved between the inner ring wall of the first annular cavity (31) and the toothed portion (23).

4. The magnetorheological brake with a high-intensity magnetic field according to claim 3, characterized in that The inner ring wall of the first annular cavity (31) is further provided with a cooling channel (372) arranged along the gap. The cooling channel (372) is arranged adjacent to the magnetorheological fluid and both ends extend to the outside to circulate and cool the magnetorheological fluid.

5. The magnetorheological brake with a high-intensity magnetic field according to claim 4, wherein, A first cooling ring plate (39) is further provided on the outer side of the inner ring wall of the first annular cavity (31). The exciting coil (4) is wound on the first cooling ring plate (39). The first cooling ring plate (39) is provided with a first cooling cavity (391), and the first cooling cavity (391) is provided with an inlet and an outlet both communicating with the outside to circulate and cool the exciting coil (4).

6. The magnetorheological brake with a high-intensity magnetic field according to claim 1, wherein, The electromagnet (51) includes an iron core (511) and a magnet coil (512). An annular groove (513) is formed on the outer circular surface of the iron core (511), and the magnet coil (512) is wound in the annular groove (513).

7. The magnetorheological brake with a high-intensity magnetic field according to claim 6, characterized in that, The electromagnet (51) further includes a second cooling ring plate (514). The second cooling ring plate (514) is fixedly sleeved on the iron core (511) and covers the outside of the magnet coil (512). The second cooling ring plate (514) is provided with a second cooling cavity (515), and the second cooling cavity (515) is provided with an inlet and an outlet both communicating with the outside to circulate and cool the magnet coil (512).

8. The magnetorheological brake with a high-intensity magnetic field according to any one of claims 1 to 7, characterized in that, The housing assembly (3) includes: A box body (34), there are two of them and they are symmetrically distributed on both sides of the rotating disc. The box body (34) is rotatably sleeved on the rotating shaft (1) and is rotationally sealed with the rotating shaft (1). The second annular cavity (32) is formed inside the box body (34); Cover plates (35), there are two of them and they are respectively fixed on the sides of the two box bodies (34) away from the brake disc (2). The cover plates (35) extend radially outside the box body (34) and form an annular mounting portion (351); A cylinder shell (36), which is connected between the two annular mounting portions (351) to serve as the outer ring wall of the first annular cavity (31); A partition cylinder (37), which is connected between the two annular mounting portions (351) and is arranged at intervals inside the cylinder shell (36) to serve as the inner ring wall of the first annular cavity (31).

9. The magnetorheological brake with a high-intensity magnetic field according to claim 8, characterized in that, The rotating shaft (1) includes a large-diameter shaft section (11) and small-diameter shaft sections (12) located on both sides of the large-diameter shaft section (11). The brake disc (2) is sleeved on the large-diameter shaft section (11). Both the box body (34) and the cover plate (35) are rotatably sleeved on the small-diameter shaft section (12) through bearings (13). The housing assembly (3) further includes retaining rings (38), there are two of them and they are respectively fixed on the sides of the two cover plates (35) away from the box body (34). One end of the bearing (13) abuts against the retaining ring (38) and the other end abuts against the shoulder formed by the large-diameter shaft section (11) and the small-diameter shaft section (12).

10. The magnetorheological brake with a high-intensity magnetic field according to claim 9, characterized in that, A part of the inner circular surface of the box body (34) in the axial direction is fixedly sleeved on the outer ring of the bearing (13) and another part is rotatably sleeved on the large-diameter shaft section (11) through a sealing ring (14).

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