Water-cooling multi-piece double-coil magneto-rheological brake

Abstract

The invention discloses a water-cooling multi-piece double-coil magneto-rheological brake which comprises a shell assembly, the shell assembly comprises a first shell and a second shell which are symmetrically arranged, annular grooves which are oppositely arranged are formed in the two shells, excitation coils and magnetism isolating rings are installed in the annular grooves from inside to outside, an annular flow channel is formed in each magnetism isolating ring, and the annular flow channels are communicated with the first shell and the second shell; a liquid inlet hole and a liquid outlet hole are formed in the shell, and the annular flow channel of the magnetism isolating ring is matched with the liquid inlet hole and the liquid outlet hole of the shell to form a cooling circulation channel; the multiple brake pads are coaxially arranged between the first shell and the second shell, the brake pads are spaced through shaft sleeves, the brake pads and the first shell as well as the brake pads and the second shell are spaced through shaft sleeves, and gaps are filled with magnetorheological fluid; the rotating shaft penetrates through the center of the shell assembly and the center of the brake pad, and the rotating shaft and the brake pad are coaxially arranged and fixedly connected. Through the design of the double coils, rapid establishment and dissipation of a magnetic field can be achieved, and therefore the braking force can be adjusted more flexibly.

Description

Technical Field

[0001] The present invention relates to a water-cooled multi-disc double-coil magnetorheological brake, belonging to the technical field of brakes. Background Art

[0002] With the development of intelligent control technology and materials science, especially the application of intelligent materials, magnetorheological brakes have gradually become a new type of braking device that can achieve rapid response and precise control, and are widely used in fields such as vehicles, robots, and construction machinery. Although traditional friction brakes have mature technologies, they have certain limitations in aspects such as high-frequency response, dynamic control, and braking force adjustment, such as small output torque and low stability. Therefore, there is an urgent need to provide a water-cooled multi-disc double-coil magnetorheological brake, which has a large output torque, a wide adjustable range of output torque, a relatively simple and compact structure, and stable working performance. Summary of the Invention

[0003] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a water-cooled multi-disc double-coil magnetorheological brake, which has a large output torque, high stability, a compact structure, and is suitable for large-scale popularization and application.

[0004] In order to achieve the above object, a water-cooled multi-disc double-coil magnetorheological brake adopted by the present invention includes:

[0005] A housing assembly, including a first housing and a second housing arranged symmetrically. An annular groove is provided inside the two housings, and an exciting coil and a magnetic isolation ring are installed in the annular groove from the inside to the outside. An annular flow channel is provided in each magnetic isolation ring. Liquid inlet holes and liquid outlet holes are provided on the housing, and the annular flow channels of the magnetic isolation rings cooperate with the liquid inlet holes and liquid outlet holes of the housing to form a cooling circulation path;

[0006] Brake discs, a plurality of the brake discs are coaxially arranged between the first housing and the second housing. The brake discs are spaced by bushings between the brake discs and between the brake discs and the first housing and the second housing, and the gaps are filled with magnetorheological fluid;

[0007] A rotating shaft, passing through the housing assembly and the centers of the brake discs, and the rotating shaft is coaxially arranged and fixedly connected with the brake discs;

[0008] When the exciting coil is energized, the viscosity of the magnetorheological fluid between the brake discs increases, generating a braking torque acting on the brake discs to brake the rotating shaft.

[0009] As an improvement, the rotating shaft is connected to each brake disc by a key, and the brake discs are parallel to each other.

[0010] As an improvement, a first end cover is bolted to the left side of the first housing, and a second end cover is bolted to the right side of the second housing.

[0011] As an improvement, bearing assemblies are provided between the first outer shell and the first end cover, and between the second outer shell and the second end cover. The bearing assembly includes a deep groove ball bearing bracket and deep groove ball bearing steel balls. The rotating shaft is rotatably installed between the first outer shell and the first end cover, and between the second outer shell and the second end cover through the bearing assembly.

[0012] As an improvement, the first outer shell and the second outer shell are bolted, and a static sealing ring is installed between the first outer shell and the second outer shell.

[0013] As an improvement, grooves are provided at the parts where the rotating shaft contacts the first outer shell and the second outer shell, and static sealing rings and dynamic sealing rings are installed in the grooves.

[0014] As an improvement, the first outer shell, the second outer shell, the brake pads, and the shaft sleeves are all made of magnetically conductive materials, and the magnetic isolation ring is made of copper material.

[0015] As an improvement, lead channels and liquid injection holes are provided on the surfaces of the first outer shell and the second outer shell.

[0016] As an improvement, static sealing rings are installed on both the left and right sides of the annular flow channel of the magnetic isolation ring.

[0017] Compared with the prior art, in the water-cooled multi-disc double-coil magnetorheological brake of the present invention, by symmetrically arranging two excitation coils, the generated magnetic field intensity is increased, thereby enhancing the shear stress of the magnetorheological fluid, and further increasing the braking torque; multiple brake pads are coaxially placed and the diameter of the brake pads is maximized, so that the working area of the magnetorheological fluid is larger, more magnetorheological fluid participates in the braking process, and a multi-layer working area design is adopted, so that the magnetorheological fluid acts simultaneously on multiple parallel shear planes, thereby superimposing to generate a larger braking torque; an annular flow channel is designed for each magnetic isolation ring, and the heat generated by the excitation coil and the magnetorheological fluid working area is dissipated and cooled through the cooling circulation path, maintaining the stable performance of the magnetorheological fluid, avoiding the decrease of the liquid shear stress caused by the temperature rise, and thus maintaining a high braking torque. Description of the Drawings

[0018] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a cross-sectional schematic diagram of the overall structure of the present invention;

[0020] Figure 3 is a cross-sectional view of the liquid injection hole of the present invention;

[0021] Figure 4 is a schematic diagram of magnetic induction lines in the working state of the excitation coil of the present invention;

[0022] Figure 5 Schematic diagram of the working area of the magnetorheological fluid of the present invention;

[0023] Figure 6 Schematic diagram of the cooling cycle of the magnetic isolation ring of the present invention;

[0024] Figure 7 Explosion diagram of the overall structure of the present invention;

[0025] In the figure: 1. First outer shell; 2. First liquid inlet hole; 3. First annular flow channel of the magnetic isolation ring; 4. First excitation coil; 5. First external hexagonal screw; 6. First end cover; 7. First connection key; 8. Rotating shaft; 9. First deep groove ball bearing bracket; 10. First deep groove ball bearing steel ball; 11. First dynamic seal ring; 12. First static seal ring; 13. First shaft sleeve; 14. First magnetic isolation ring; 15. First lead channel; 16. Second static seal ring; 17. Third static seal ring; 18. First liquid outlet hole; 19. First brake pad; 20. Fourth static seal ring; 21. Second shaft sleeve; 22. Second brake pad; 23. Second liquid outlet hole; 24. Fifth static seal ring; 25. Sixth static seal ring; 26. Second annular flow channel of the magnetic isolation ring; 27. Second lead channel; 28. Second external hexagonal screw; 29. Seventh static seal ring; 30. Second dynamic seal ring; 31. Second end cover; 32. Second deep groove ball bearing steel ball; 33. Second deep groove ball bearing bracket; 34. Second connection key; 35. Third connection key; 36. Fourth connection key; 37. Fifth connection key; 38. Fourth shaft sleeve; 39. Third brake pad; 40. Third shaft sleeve; 41. Second excitation coil; 42. Second magnetic isolation ring; 43. Second liquid inlet hole; 44. Second outer shell; 45. Third external hexagonal screw; 46. First liquid injection hole; 47. Second liquid injection hole. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present disclosure.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "left" and "right" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention.

[0028] As Figures 1 - 7As shown in the figure, a water-cooled multi-disc double-coil magnetorheological brake includes a housing assembly, brake pads installed inside the housing assembly, and a rotating shaft 8 installed at the center of the housing assembly and the brake pads;

[0029] The housing assembly includes a first housing 1 and a second housing 44 arranged symmetrically. Opposite annular grooves are provided inside the two housings. An exciting coil and a magnetic isolation ring are installed in the annular groove from the inside to the outside. An annular flow channel is provided inside each magnetic isolation ring. Liquid inlet holes and liquid outlet holes are provided on the housing. The annular flow channels of the magnetic isolation rings cooperate with the liquid inlet holes and liquid outlet holes of the housing to form a cooling circulation path; As Figure 6 shown in the figure, in view of the magnetorheological heat dissipation problem, the present invention designs the structure of the magnetic isolation ring. An annular flow channel is provided at the center of the magnetic isolation ring, which matches the liquid inlet hole and the liquid outlet hole on the housing to form a cooling circulation path, effectively dissipating heat, maintaining the stable performance of the magnetorheological fluid, and avoiding the decrease of the liquid shear stress caused by the temperature rise, so as to maintain a high braking torque;

[0030] A plurality of the brake pads are coaxially arranged between the first housing 1 and the second housing 44. The brake pads are spaced by bushings between the brake pads and between the brake pads and the first housing 1 and the second housing 44. At the same time, the gaps between the brake pads and between the brake pads and the first housing 1 and the second housing 44 are filled with magnetorheological fluid, as Figure 5 shown in the figure;

[0031] The rotating shaft 8 passes through the housing assembly and the center of the brake pads. The rotating shaft 8 is coaxially arranged with the brake pads. The brake pads are fixed on the rotating shaft 8 and can rotate synchronously with the rotating shaft 8;

[0032] When the exciting coil is energized, the viscosity of the magnetorheological fluid between the brake pads and between the brake pads and the housing increases, generating a braking torque acting on the brake pads to brake the rotating shaft 8.

[0033] As an improved embodiment, as Figure 2 、 Figure 7 shown in the figure, an annular groove is provided inside the first housing 1. A first exciting coil 4 and a first magnetic isolation ring 14 are provided in the annular groove. The first magnetic isolation ring 14 is arranged outside the first exciting coil 4. A first magnetic isolation ring annular flow channel 3 is provided in the middle of the first magnetic isolation ring 14. This annular flow channel matches the first liquid inlet hole 2 and the first liquid outlet hole 18 on the first housing 1 to form a cooling circulation path. A second static seal ring 16 and a third static seal ring 17 are respectively placed on both sides of the first magnetic isolation ring annular flow channel 3; An annular groove is provided inside the second housing 44. A second exciting coil 41 and a second magnetic isolation ring 42 are provided in the annular groove. The second magnetic isolation ring 42 is arranged outside the second exciting coil 41. A second magnetic isolation ring annular flow channel 26 is provided on the second magnetic isolation ring 42. A fifth static seal ring 24 and a sixth static seal ring 25 are respectively placed on the left and right sides of this annular flow channel.

[0034] As an embodiment of the improvement, as Figure 2 , Figure 7 shown, the rotating shaft 8 is key-connected to each brake pad, and the brake pads are parallel to each other. Specifically, key grooves are provided at both ends and in the middle of the rotating shaft 8. The key grooves provided at both ends are for placing the first connecting key 7 and the second connecting key 34, and the key groove provided in the middle is for placing the third connecting key 35, the fourth connecting key 36, and the fifth connecting key 37. The third connecting key 35 is axially fixedly connected to the third brake pad 39, the fourth connecting key 36 is axially fixedly connected to the second brake pad 22, and the fifth connecting key 37 is axially fixedly connected to the first brake pad 19. First bushings 13, second bushings 21, third bushings 40, and fourth bushings 38 are respectively provided between the first housing 1, the first brake pad 19, the second brake pad 22, the third brake pad 39, and the second housing 44, as Figure 2 shown. The first brake pad 19, the second brake pad 22, and the third brake pad 39 are coaxially placed and are coaxial with the rotating shaft 8. The first bushings 13, the second bushings 21, the third bushings 40, and the fourth bushings 38 are coaxially placed and are coaxial with the rotating shaft 8.

[0035] As an embodiment of the improvement, as Figure 1 , Figure 2 , Figure 7 shown, a first end cover 6 is bolted to the left side of the first housing 1, and a second end cover 31 is bolted to the right side of the second housing 44. Specifically, the first end cover 6 and the first housing 1 are fixedly connected by first external hexagon head screws 5. A deep groove ball bearing composed of a first deep groove ball bearing bracket 9 and first deep groove ball bearing steel balls 10 is installed between the first end cover 6 and the first housing 1. The rotating shaft 8 passes through the central parts of the first end cover 6 and the first housing 1; the second end cover 31 and the second housing 44 are fixedly connected by second external hexagon head screws 28. A deep groove ball bearing composed of a second deep groove ball bearing bracket 33 and second deep groove ball bearing steel balls 32 is installed between the second end cover 31 and the second housing 44. The rotating shaft 8 is rotatably installed between the first end cover 6 and the first housing 1 and between the second end cover 31 and the second housing 44 through two deep groove ball bearings.

[0036] As an embodiment of the improvement, four threaded through holes are evenly distributed on the surfaces of the first end cover 6 and the second end cover 31, four threaded holes are evenly distributed in the central part of the first housing 1, four threaded through holes are evenly distributed at the edge, four threaded holes are evenly distributed in the central part of the second housing 44, and four threaded holes are evenly distributed in the inner part of the edge.

[0037] As an embodiment of the improvement, as Figure 2As shown, the first outer shell 1 and the second outer shell 44 are fixedly connected by a third external hexagonal screw 45, and a fourth static sealing ring 20 is provided at the part where the second outer shell 44 contacts the first outer shell 1.

[0038] As an improved embodiment, as Figure 2 、 Figure 7 shown, a groove is provided at the part where the first outer shell 1 contacts the rotating shaft 8 for placing the first static sealing ring 12 and the first dynamic sealing ring 11, and a groove is provided at the part where the second outer shell 44 contacts the rotating shaft 8 for placing the seventh static sealing ring 29 and the second dynamic sealing ring 30.

[0039] As an improved embodiment, as Figure 1 、 Figure 2 and Figure 7 shown, a first lead channel 15 and a first liquid injection hole 46 are provided on the surface of the first outer shell 1, and the first liquid inlet hole 2 and the first liquid outlet hole 18 are provided on the side. A second lead channel 27 and a second liquid injection hole 47 are provided on the surface of the second outer shell 44, and the second liquid inlet hole 43 and the second liquid outlet hole 23 are provided on the side.

[0040] As an improved embodiment, the first outer shell 1, the second outer shell 44, the first shaft sleeve 13, the second shaft sleeve 21, the third shaft sleeve 40, the fourth shaft sleeve 38, the first brake pad 19, the second brake pad 22 and the third brake pad 39 are all made of magnetically conductive materials, and the first magnetic isolation ring 14 and the second magnetic isolation ring 42 are both made of copper materials.

[0041] The working principle of the present invention:

[0042] As Figure 2 shown, when the first excitation coil 4 and the second excitation coil 41 are not energized, the rotating shaft 8 is in a rotating state, and the magnetorheological fluid in the gap between the first brake pad 19, the second brake pad 22 and the third brake pad 39 is in a low-viscosity fluid state. At this time, the resistance of the magnetorheological fluid to the brake pad is very small, and there is almost no braking torque, and the rotating shaft 8 can rotate at a high speed;

[0043] As Figure 4 shown, when the first excitation coil 4 and the second excitation coil 41 are energized, the magnetorheological fluid in the gap between the first brake pad 19, the second brake pad 22 and the third brake pad 39 changes to a quasi-solid state within millimeters, causing the viscosity of the magnetorheological fluid to increase sharply, thereby generating a braking torque acting on the brake pad, and then braking the rotating shaft 8. Moreover, by adjusting the intensity of the magnetic field, stepless adjustment of the braking torque can be achieved.

[0044] Through the design of a dual coil, the present invention can achieve the rapid establishment and dissipation of a magnetic field, thereby more flexibly adjusting the braking force. In addition, the dual coil arrangement can also reduce the spatial non-uniformity of the magnetic field and improve the overall braking effect. The multi-piece brake pad structure is mainly used to increase the bearing area of the braking force, thereby achieving more efficient braking performance. A water-cooled heat dissipation system is introduced into the magnetorheological brake to address the problem of heat accumulation under high-frequency and high-load conditions. The water-cooled heat dissipation system removes heat by circulating cooling water, keeping the temperature of the magnetorheological fluid and the brake within a safe range, ensuring the stability and reliability of the system, thereby maintaining stable performance and extending the service life.

[0045] It should be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0046] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A water-cooled multi-disc double-coil magnetorheological brake, characterized in that, Comprising: A housing assembly, including a first housing (1) and a second housing (44) arranged symmetrically. Inside the two housings, there are annular grooves arranged oppositely. An exciting coil and a magnetic shielding ring are installed in the annular groove from the inside to the outside. Each magnetic shielding ring is provided with an annular flow channel. The housing is provided with a liquid inlet hole and a liquid outlet hole. The annular flow channel of the magnetic shielding ring cooperates with the liquid inlet hole and the liquid outlet hole of the housing to form a cooling circulation path; Brake pads, a plurality of the brake pads are coaxially arranged between the first housing (1) and the second housing (44). The brake pads are spaced by bushings between them and between the brake pads and the first housing (1) and the second housing (44), and the gap is filled with magnetorheological fluid; A rotating shaft (8), passing through the housing assembly and the center of the brake pads, and the rotating shaft (8) is coaxially arranged and fixedly connected with the brake pads; When the exciting coil is energized, the viscosity of the magnetorheological fluid between the brake pads increases, generating a braking torque acting on the brake pads to brake the rotating shaft (8).

2. The water-cooled multi-disc double-coil magnetorheological brake according to claim 1, wherein The rotating shaft (8) is connected to each brake pad by a key, and the brake pads are parallel to each other.

3. The water-cooled multi-disc double-coil magnetorheological brake according to claim 1, wherein A first end cover (6) is bolted to the left side of the first housing (1), and a second end cover (31) is bolted to the right side of the second housing (44).

4. A water-cooled multi-disc double-coil magnetorheological brake according to claim 3, characterized in that, Bearing assemblies are provided between the first housing (1) and the first end cover (6), and between the second housing (44) and the second end cover (31). The bearing assemblies include deep groove ball bearing brackets and deep groove ball bearing steel balls. The rotating shaft (8) is rotatably installed between the first housing (1) and the first end cover (6), and between the second housing (44) and the second end cover (31) through the bearing assemblies.

5. The water-cooled multi-disc double-coil magnetorheological brake according to claim 1, characterized in that, The first housing (1) and the second housing (44) are bolted, and a static sealing ring is installed between the first housing (1) and the second housing (44).

6. The water-cooled multi-disc double-coil magnetorheological brake according to claim 1, characterized in that, Grooves are provided at the parts where the rotating shaft (8) contacts the first housing (1) and the second housing (44), and a static sealing ring and a dynamic sealing ring are installed in the grooves.

7. A water-cooled multi-disc double-coil magnetorheological brake according to claim 1, characterized in that, The first housing, the second housing (44), the brake pads, and the bushings are all made of magnetic conductive materials, and the magnetic shielding ring is made of copper material.

8. A water-cooled multi-disc double-coil magnetorheological brake according to claim 1, characterized in that, Lead channels and liquid injection holes are provided on the surfaces of the first housing (1) and the second housing (44).

9. A water-cooled multi-disc double-coil magnetorheological brake according to claim 1, characterized in that, Static sealing rings are installed on both the left and right sides of the annular flow channel of the magnetic shielding ring.

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