A magnetorheological brake with integrated shear and shear valve dual working modes

Abstract

The present invention provides a magnetorheological brake with integrated shear and shear valve dual working modes, including a mounting set, a brake structure and a driven structure; the driven structure includes a first driven ring, a second driven ring and a winding frame, the first driven ring and the second driven ring are both connected to the winding frame, and an excitation coil is wound on the winding frame; the brake structure includes a rotating shaft and a brake disc, the brake disc is sleeved on the rotating shaft, and the brake disc is connected to the winding frame through a cylindrical cam structure; the two opposite side walls of the first driven ring and the two opposite side walls of the second driven ring respectively leave axial damping gaps with the two opposite side walls of the mounting set, and the two opposite side walls of the brake disc and the two opposite side walls of the mounting set leave radial damping gaps. Through the present application, it is possible to provide a higher torque-to-volume ratio without changing the structural dimensions, which is conducive to satisfying the occasions where the installation space is small and a large output torque can be provided.

Description

Technical Field

[0001] The invention relates to the field of magnetorheological brakes, and in particular to a magnetorheological brake with integrated shear and shear valve dual working modes. Background Art

[0002] Magnetorheological brake is one of the magnetorheological intelligent devices. Thanks to the rheological effect of magnetorheological fluid, it has the advantages of fast response speed, simple structure and adjustable braking torque. According to the different fluid flow channels, magnetorheological brakes can be divided into drum type, disc type and hybrid type.

[0003] The working area of ​​a drum magnetorheological brake is generally the damping gap formed between the inner circumferential surface of the fixed housing and the outer circumferential surface of the brake drum. The working area of ​​a disc magnetorheological brake is generally the damping gap formed between the end face of the brake disc and the end face of the fixed disc. They all increase the output torque by increasing the number or length of rotors, which increases the volume of the brake and makes it inconvenient to install. Hybrid magnetorheological brakes have both axial damping gaps and radial damping gaps, which can further improve the performance of the brake, but due to the increase in the number of damping gaps, the volume of the brake also increases. The three different types of magnetorheological brakes will increase the volume of the brake while increasing the output torque.

[0004] The working modes of magnetorheological fluid are divided into valve type, shear type, extrusion type and other working modes. Most magnetorheological brakes only use the shear working mode. Limited by the maximum shear yield stress of the magnetorheological fluid and the size of the brake, the torque-to-volume ratio of the magnetorheological brake is generally low, which cannot meet the occasions with small installation space and large output torque requirements. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a magnetorheological brake with integrated shear and shear valve dual working modes to solve the deficiencies in the prior art.

[0006] To achieve the above-mentioned object, the present invention provides a magnetorheological brake with integrated shear and shear valve dual working modes, comprising a mounting kit, a brake structure and a driven structure arranged in the mounting kit;

[0007] The driven structure is sleeved on the outer side of the brake structure, and the driven structure includes a first driven ring, a second driven ring and a winding frame, the first driven ring and the second driven ring are respectively located on two opposite sides of the winding frame, and the first driven ring and the second driven ring are both connected to the winding frame, and an excitation coil is wound on the winding frame;

[0008] The brake structure comprises a connected rotating shaft and a brake disc, wherein the brake disc is sleeved on the rotating shaft, and the brake disc and the rotating shaft share a central axis, and the brake disc is connected to the winding frame through a cylindrical cam structure, and the brake disc is used to synchronously drive the driven structure to move in a direction parallel to the rotating shaft through the cylindrical cam structure as the rotating shaft rotates;

[0009] Wherein, the two side walls opposite to each other of the first driven ring and the two side walls opposite to each other of the second driven ring respectively leave axial damping gaps with the two side walls opposite to each other of the mounting sleeve, and the two side walls opposite to each other of the brake disc leave radial damping gaps with the two side walls opposite to each other of the mounting sleeve, and the extension direction of the axial damping gap is perpendicular to the extension direction of the radial damping gap, and the extension direction of the axial damping gap is parallel to the central axis of the rotating shaft.

[0010] The beneficial effects of the present invention are as follows: by arranging a braking structure and a driven structure in the mounting set, a radial damping gap is formed between the brake disc of the braking structure and the mounting set, and an axial damping gap is formed between the first driven ring and the second driven ring of the driven structure and the mounting set respectively; by winding an excitation coil on a winding frame and energizing the excitation coil to provide a working magnetic field, the brake disc is driven to rotate by the rotating shaft in the braking structure; during the rotation of the brake disc, the winding frame, the first driven ring and the second driven ring in the driven structure are driven to move in a direction parallel to the rotating shaft by the cylindrical cam structure, so that the shear working mode and the shear valve working mode can be performed simultaneously, so as to provide a higher torque-to-volume ratio without changing the structural size, which is beneficial to meet the needs of small installation space and large output torque. At the same time, the brake also has the characteristics of short response time and good dynamic performance.

[0011] Preferably, the installation kit includes two magnetic conductive barrels, two magnetic shielding covers and a cylinder barrel, and the two magnetic conductive barrels, the two magnetic shielding covers and the cylinder barrel are combined to form a closed space, and the driven structure and the braking structure are both located in the closed space.

[0012] Preferably, one end of the two magnetic barrels are rotatably connected to the rotating shaft through a connecting structure, the two magnetic barrels are respectively located at opposite ends of the brake disc, the cylinder barrel is sleeved on the outside of the driven structure, and the two magnetic isolation covers are respectively located at opposite ends of the cylinder barrel, one end of each magnetic isolation cover is connected to the cylinder barrel, and the other end of the magnetic isolation cover is connected to the other end of the corresponding magnetic barrel.

[0013] Preferably, the connecting structure includes an end cover and a bearing, the bearing is sleeved on the rotating shaft, the end cover is sleeved on the bearing, the end cover is connected to the corresponding magnetic barrel, the magnetic barrel is sleeved on the flange of the brake disc, and the magnetic barrel is limited between the end cover and the brake disc.

[0014] Preferably, the flange of the brake disc is sealed and connected to the corresponding magnetic barrel via an oil seal.

[0015] Preferably, the cylindrical cam structure includes a cylindrical boss and arc-shaped teeth, the arc-shaped teeth are arranged on the inner surface of the winding frame, the cylindrical boss is arranged on the inner side wall of the arc-shaped teeth away from the winding frame, a cam groove is opened on the side of the brake disc, one end of the cylindrical boss is inserted into the cam groove, and an arc-shaped tooth groove is opened on the magnetic barrel, and the arc-shaped teeth extend out of the winding frame and extend into the arc-shaped tooth groove.

[0016] Preferably, the arc-shaped teeth are interference fit with the inner surface of the first driven ring and / or the second driven ring.

[0017] Preferably, the magnetic barrel, the cylinder, the first driven ring, the second driven ring and the brake disc are all made of magnetic conductive materials, and the rotating shaft, the end cover, the magnetic isolation cover and the winding frame are all made of magnetic isolation materials.

[0018] Preferably, the rotating shaft rotates synchronously with the brake disc via a flat key.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a magnetorheological brake with integrated shear and shear valve dual working modes provided by an embodiment of the present invention;

[0021] Figure 2 A cross-sectional view of a magnetorheological brake with integrated shear and shear valve dual working modes provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of a magnetorheological brake with integrated shear and shear valve dual working modes provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of a winding frame provided in an embodiment of the present invention;

[0024] Figure 5 A schematic structural diagram of a magnetic conductive barrel provided in an embodiment of the present invention.

[0025] Description of main component symbols:

[0026] 10. Rotating shaft; 11. Brake disc; 12. Flat key; 20. First driven ring; 21. Second driven ring; 22. Winding rack; 221. Circular groove; 23. Excitation coil; 24. Cylindrical boss; 25. Arc-shaped teeth; 31. First axial damping gap; 32. Second axial damping gap; 33. Third axial damping gap; 34. Fourth axial damping gap; 35. First radial damping gap; 36. Second radial damping gap; 41. Magnetic barrel; 411. Arc-shaped tooth groove; 42. Magnetic shielding cover; 43. Cylinder barrel; 44. End cover; 45. Bearing.

[0027] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] See also Figures 1 to 5 , which is a magnetorheological brake with integrated shear and shear valve dual working modes in an embodiment of the present invention, includes a mounting set, a braking structure and a driven structure.

[0032] Among them: the braking structure and the driven structure are both arranged in the installation kit, the driven structure is sleeved on the outside of the braking structure, the braking structure is used to drive the driven structure to move, the braking structure includes a rotating shaft 10 and a brake disc 11, the brake disc 11 is an annular structure, the brake disc 11 is sleeved on the rotating shaft 10, and the brake disc 11 and the rotating shaft 10 share a central axis, and at the same time, the brake disc 11 is connected to the rotating shaft 10 through a flat key 12, specifically, the flat key 12 is connected to the inner surface of the brake disc 11, and a groove is opened on the side of the rotating shaft 10, and the flat key 12 is embedded in the groove, so that the rotating shaft 10 drives the brake disc 11 to rotate synchronously.

[0033] In this embodiment, the driven structure includes a first driven ring 20, a second driven ring 21 and a winding frame 22. The first driven ring 20 and the second driven ring 21 are respectively located on opposite sides of the winding frame 22. The first driven ring 20 and the second driven ring 21 are both connected to the winding frame 22. The winding frame 22 is a circular ring structure. The winding frame 22 is sleeved on the outer side of the brake disc 11. A circular ring groove 221 is provided on the outer surface of the winding frame 22. An excitation coil 23 is wound in the circular ring groove 221. The brake disc 11 is connected to the inner surface of the winding frame 22 through a cylindrical cam structure, so that when the brake disc 11 rotates with the rotating shaft 10, the cylindrical cam structure can drive the winding frame 22, the first driven ring 20 and the second driven ring 21 to move in a direction parallel to the rotating shaft 10.

[0034] It should be noted that the central axis of the first driven ring 20, the central axis of the second driven ring 21, the central axis of the winding frame 22 and the central axis of the brake disc 11 are all on the same straight line, and the opposite side walls of the first driven ring 20 and the opposite side walls of the mounting sleeve both have axial damping gaps, which are the first axial damping gap 31 and the second axial damping gap 32 respectively, the opposite side walls of the second driven ring 21 and the opposite side walls of the mounting sleeve also have axial damping gaps, which are the third axial damping gap 33 and the fourth axial damping gap 34 respectively, and the opposite side walls of the brake disc 11 and the opposite side walls of the mounting sleeve both have radial damping gaps, which are the first radial damping gap 35 and the second radial damping gap 36 respectively, wherein the extension direction of the axial damping gap is perpendicular to the extension direction of the radial damping gap, and the extension direction of the axial damping gap is parallel to the central axis of the rotating shaft 10, and magnetorheological fluid is injected into the axial damping gap and the radial damping gap.

[0035] It should be noted that the excitation coil 23 can be connected to an external power supply. After the excitation coil 23 is powered on, a magnetic field can be formed. The viscosity of the magnetorheological fluid increases in the magnetic field environment, thereby generating a shear force that suppresses the rotation of the brake disc 11, thereby realizing the shear working mode. At the same time, while the rotating shaft 10 drives the brake disc 11 to rotate, the brake disc 11 drives the winding frame 22, the first driven ring 20 and the second driven ring 21 to move in a direction parallel to the rotating shaft 10 through the cylindrical cam structure, thereby generating a shear force that suppresses the movement of the first driven ring 20 and the second driven ring 21, thereby realizing the shear valve working mode.

[0036] It should be supplemented that when the brake disc 11 rotates one circle, the first driven ring 20, the winding rack 22 and the second driven ring 21 reciprocate left and right once. When the first driven ring 20, the winding rack 22 and the second driven ring 21 reciprocate left and right with the rotation of the brake disc 11, the lengths of the first axial damping gap 31 and the fourth axial damping gap 34 will change. Specifically, when the first driven ring 20 and the second driven ring 21 move to the left, the length of the first axial damping gap 31 increases and the length of the fourth axial damping gap 34 decreases. When the first driven ring 20 and the second driven ring 21 move to the right, the length of the first axial damping gap 31 decreases and the fourth axial damping gap 34 increases until the rated stroke is reached.

[0037] In this embodiment, the installation kit includes two magnetic barrels 41, two magnetic shielding covers 42 and a cylinder 43. The two magnetic barrels 41, the two magnetic shielding covers 42 and the cylinder 43 are combined to form a closed space. The driven structure and the brake structure are both located in the closed space. The two magnetic barrels 41 are respectively located at opposite ends of the brake disc 11, and the two magnetic barrels 41 are symmetrically arranged around the center point of the brake disc 11. One end of each magnetic barrel 41 is rotatably connected to the rotating shaft 10 through a connecting structure. The cylinder 43 is sleeved on the outside of the driven structure. That is, the cylinder 43 is sleeved on the outside of the winding frame 22, the first driven ring 20 and the second driven ring 21, and the two magnetic isolation covers 42 are respectively located at the opposite ends of the cylinder 43, and the central axis of the magnetic isolation cover 42, the central axis of the cylinder 43 and the central axis of the brake disc 11 are all on the same straight line, and the magnetic isolation cover 42 is located on the side of the magnetic barrel 41 away from the brake disc 11, one end of each magnetic isolation cover 42 is connected to the end of the corresponding cylinder 43 through a bolt structure, and the other end thereof is connected to the other end of the corresponding magnetic barrel 41 through a bolt structure.

[0038] In this embodiment, the connection structure includes an end cover 44 and a bearing 45. The bearing 45 is sleeved on the rotating shaft 10, and the end cover 44 is sleeved on the bearing 45. The inner surface of the bearing 45 is connected to the rotating shaft 10, and the outer surface of the bearing 45 is connected to the inner surface of the end cover 44. The end cover 44 is connected to the corresponding magnetic barrel 41 through a bolt structure. The magnetic barrel 41 is sleeved on the flange of the brake disc 11, and the magnetic barrel 41 is rotatably connected to the flange of the brake disc 11. The magnetic barrel 41 is limited between the end cover 44 and the brake disc 11. When the rotating shaft 10 rotates, the brake disc 11 rotates, and the magnetic barrel 41 remains relatively stationary under the action of the bearing 45.

[0039] In this embodiment, the flange of the brake disc 11 is sealed and connected to the corresponding magnetic barrel 41 via an oil seal.

[0040] In this embodiment, the cylindrical cam structure includes a cylindrical boss 24 and an arc-shaped tooth 25. The arc-shaped tooth 25 is arranged on the inner surface of the winding frame 22. The number of the arc-shaped teeth 25 is multiple, and the multiple arc-shaped teeth 25 are evenly distributed at equal angles along the circumference of the winding frame 22. The cylindrical boss 24 is arranged on the inner side wall of the arc-shaped tooth 25 away from the winding frame 22. A cam groove is provided on the side of the brake disc 11, and one end of the cylindrical boss 24 is inserted into the cam groove. Arc-shaped tooth grooves 411 are provided on the two magnetic barrels 41. The opposite ends of the arc-shaped tooth 25 extend out of the winding frame 22 and extend into the arc-shaped tooth grooves 411 on the corresponding magnetic barrels 41. It should be noted that when the brake disc 11 rotates, the cam groove also rotates accordingly, and the cylindrical boss 24 cooperates with the cam groove to drive the winding frame 22 to move.

[0041] It should be noted that the opposite ends of the arc-shaped teeth 25 are respectively interference fit with the inner surfaces of the first driven ring 20 and the second driven ring 21, so that the winding frame 22 can move along the direction parallel to the rotating axis 10 under the drive of the brake disc 11, and in the process of the movement of the winding frame 22, it can also drive the first driven ring 20 and the second driven ring 21 to move synchronously along the direction parallel to the rotating axis 10.

[0042] In this embodiment, the magnetic barrel 41, the cylinder 43, the first driven ring 20, the second driven ring 21 and the brake disc 11 are all made of magnetic conductive materials, and the rotating shaft 10, the end cover 44, the magnetic isolation cover 42 and the winding frame 22 are all made of magnetic isolation materials.

[0043] In the specific implementation, a braking structure and a driven structure are arranged in the mounting set, a radial damping gap is formed between the brake disc 11 of the braking structure and the mounting set, and an axial damping gap is formed between the first driven ring 20 and the second driven ring 21 of the driven structure and the mounting set respectively. An excitation coil 23 is wound on the winding frame 22 and the excitation coil 23 is powered on to provide a working magnetic field. Then, the brake disc 11 is driven to rotate by the rotating shaft 10 in the braking structure. During the rotation of the brake disc 11, the winding frame 22, the first driven ring 20 and the second driven ring 21 in the driven structure are driven to move in a direction parallel to the rotating shaft 10 by the cylindrical cam structure, so that the shear working mode and the shear valve working mode can be performed simultaneously, so as to provide a higher torque-to-volume ratio without changing the structural size, which is beneficial to meet the needs of small installation space and large output torque. At the same time, the brake also has the characteristics of short response time and good dynamic performance.

[0044] It should be noted that the above implementation process is only for illustrating the feasibility of the present application, but this does not mean that the magnetorheological brake with integrated shear and shear valve dual working modes of the present application has only the above-mentioned only implementation process. On the contrary, as long as the magnetorheological brake with integrated shear and shear valve dual working modes of the present application can be implemented, it can be included in the feasible implementation plan of the present application.

[0045] 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.

[0046] 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 present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A magnetorheological brake with integrated shear and shear valve dual working modes, characterized in that: It comprises a mounting set, a braking structure and a driven structure arranged in the mounting set; The driven structure is sleeved on the outer side of the brake structure, and the driven structure includes a first driven ring, a second driven ring and a winding frame, the first driven ring and the second driven ring are respectively located on two opposite sides of the winding frame, and the first driven ring and the second driven ring are both connected to the winding frame, and an excitation coil is wound on the winding frame; The brake structure comprises a connected rotating shaft and a brake disc, wherein the brake disc is sleeved on the rotating shaft, and the brake disc and the rotating shaft share a central axis, and the brake disc is connected to the winding frame through a cylindrical cam structure, and the brake disc is used to synchronously drive the driven structure to move in a direction parallel to the rotating shaft through the cylindrical cam structure as the rotating shaft rotates; Wherein, the two side walls opposite to the first driven ring and the two side walls opposite to the second driven ring respectively leave axial damping gaps with the two side walls opposite to the mounting set, the two side walls opposite to the brake disc leave radial damping gaps with the two side walls opposite to the mounting set, the extension direction of the axial damping gap is perpendicular to the extension direction of the radial damping gap, and the extension direction of the axial damping gap is parallel to the central axis of the rotating shaft; The installation kit includes two magnetic barrels, two magnetic isolation covers and a cylinder barrel. The two magnetic barrels, the two magnetic isolation covers and the cylinder barrel are combined to form a closed space. The driven structure and the brake structure are both located in the closed space. One end of the two magnetic barrels are rotatably connected to the rotating shaft through a connecting structure. The two magnetic barrels are respectively located at opposite ends of the brake disc. The cylinder barrel is sleeved on the outside of the driven structure. The two magnetic isolation covers are respectively located at opposite ends of the cylinder barrel. One end of each magnetic isolation cover is connected to the cylinder barrel, and the other end of the magnetic isolation cover is connected to the other end of the corresponding magnetic barrel.

2. The magnetorheological brake with integrated shear and shear valve dual working modes according to claim 1, characterized in that: The connection structure includes an end cover and a bearing, wherein the bearing is sleeved on the rotating shaft, the end cover is sleeved on the bearing, the end cover is connected to the corresponding magnetic barrel, the magnetic barrel is sleeved on the flange of the brake disc, and the magnetic barrel is limited between the end cover and the brake disc.

3. The magnetorheological brake with integrated shear and shear valve dual working modes according to claim 1, characterized in that: The flange of the brake disc is sealed and connected to the corresponding magnetic barrel via an oil seal.

4. The magnetorheological brake with integrated shear and shear valve dual working modes according to claim 1, characterized in that: The cylindrical cam structure includes a cylindrical boss and arc-shaped teeth, the arc-shaped teeth are arranged on the inner surface of the winding frame, the cylindrical boss is arranged on the inner side wall of the arc-shaped teeth away from the winding frame, a cam groove is opened on the side of the brake disc, one end of the cylindrical boss is inserted into the cam groove, and an arc-shaped tooth groove is opened on the magnetic barrel, and the arc-shaped teeth extend out of the winding frame and extend into the arc-shaped tooth groove.

5. The magnetorheological brake with integrated shear and shear valve dual working modes according to claim 4, characterized in that: The arc-shaped teeth are interference-fitted with the inner surface of the first driven ring and / or the second driven ring.

6. The magnetorheological brake with integrated shear and shear valve dual working modes according to claim 2, characterized in that: The magnetic barrel, the cylinder, the first driven ring, the second driven ring and the brake disc are all made of magnetic conductive materials, and the rotating shaft, the end cover, the magnetic shielding cover and the winding frame are all made of magnetic shielding materials.

7. The magnetorheological brake with integrated shear and shear valve dual working modes according to claim 1, characterized in that: The rotating shaft rotates synchronously with the brake disc via a flat key.

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