A magnetorheological brake with different operating modes for forward and reverse rotation

Abstract

The application provides a magnetorheological brake with different working modes in positive and reverse rotation, comprising a mounting shell, a braking structure and a return structure; the mounting shell comprises a cylinder, a first end cover and a second end cover, and the cylinder, the first end cover and the second end cover combine to form a closed space; the braking structure comprises a first brake disc, a second brake disc and a magnetic member, the first brake disc and the second brake disc are engaged in transmission, the first brake disc and the second brake disc are respectively sleeved on an input shaft and a controlled shaft, the magnetic member is sleeved on the outside of the first brake disc and the second brake disc, and the magnetic member is used for generating a magnetic field; the return structure is sleeved on the controlled shaft, one end of the return structure is connected with the second brake disc, the other end of the return structure is connected with the controlled shaft, the second brake disc is connected with the controlled shaft, and through the application, different working modes are realized in the case of the same magnetorheological brake, and the output brake torque is different in different working modes.

Description

Technical Field

[0001] This invention relates to the field of braking technology, and in particular to a magnetorheological brake that has different working modes in both forward and reverse rotation. Background Technology

[0002] Magnetorheological brakes are a type of magnetorheological intelligent device. Relying on the rheological effect of magnetorheological fluid, they feature fast response and adjustable braking torque. The operating modes of a magnetorheological brake are determined based on the working mode of the magnetorheological fluid within the damping gap of the brake, and can be mainly divided into compression mode, shearing mode, valve mode, and shear valve mode.

[0003] Traditional magnetorheological brakes generally only have a shearing working mode, meaning that the magnetorheological fluid in the damping gap between the rotor and stator is only subjected to circumferential shearing. Therefore, when designing the structure of a magnetorheological brake to increase the output braking torque, methods such as increasing the length and radius of the effective damping gap and increasing the number of brake discs are used to improve the output braking torque. This inevitably increases the size of the magnetorheological brake, making it unsuitable for practical applications.

[0004] There are now magnetorheological brakes that convert the rotational motion of the rotor into the lateral movement of the mover to achieve a shear valve working mode. Compared with magnetorheological brakes that only have a shear valve working mode, magnetorheological brakes with a shear valve working mode can output a larger output braking torque under the same size, which increases the torque-to-volume ratio of the magnetorheological brake and makes it suitable for practical applications.

[0005] For both traditional magnetorheological brakes and magnetorheological brakes with shear valve operating modes, they all have only one braking torque output range. Under long-term use of magnetorheological brakes, the thickness of the damping gap will increase with the time of use, thereby reducing the output braking torque, reducing the adjustable range of braking torque, and reducing the service life of the magnetorheological brake. Summary of the Invention

[0006] Therefore, the purpose of this invention is to provide a magnetorheological brake with different working modes in both forward and reverse rotation, so as to overcome the shortcomings of the prior art.

[0007] To achieve the above objectives, the present invention provides a magnetorheological brake with different operating modes for forward and reverse rotation, comprising a mounting housing, a braking structure, and a return structure; The mounting housing includes a cylinder, a first end cover, and a second end cover. The cylinder, the first end cover, and the second end cover are combined to form a closed space. The braking structure and the return structure are both located in the closed space. The braking structure includes a first brake disc, a second brake disc, and a magnetizing element. The first brake disc and the second brake disc engage in transmission. The first brake disc and the second brake disc are respectively sleeved on the input shaft and the controlled shaft. The magnetizing element is sleeved on the outside of the first brake disc and the second brake disc and is used to generate a magnetic field. The return structure is sleeved on the controlled shaft, and one end of the return structure is connected to the controlled shaft through a limiting block, while the other end of the return structure is connected to the second brake disc. A radial damping gap is formed between the first end cap and the first brake disc, and at least one of a first axial damping gap, a second axial damping gap, and a third axial damping gap is formed between the magnetizing component, the first brake disc, and the second brake disc according to the different directions of the input shaft.

[0008] The beneficial effects of this invention are as follows: By combining the cylinder, the first end cover, and the second end cover to form a closed space, the braking structure and the return structure are placed in the closed space. Then, the first brake disc and the second brake disc of the braking structure are engaged and driven. The first brake disc and the second brake disc are respectively sleeved on the input shaft and the controlled shaft. The magnetizing component of the braking structure is sleeved on the outside of the first brake disc and the second brake disc. The return structure is sleeved on the controlled shaft. One end of the return structure is connected to the second brake disc, and the other end of the return structure is connected to the controlled shaft through a limiting block. The second brake disc is also connected to the controlled shaft. This allows the output braking torque range of the magnetorheological brake to be changed by controlling the direction of the input shaft. Under the same magnetorheological brake, different working modes are achieved, and the output braking torque is different under different working modes. At the same time, the adjustable range of braking torque can be increased, and the service life of the magnetorheological brake can be increased.

[0009] Preferably, the magnetizing component includes a magnetic isolation ring, an excitation coil, and a magnetic guide ring. The magnetic guide ring is disposed between the braking structure and the cylinder. One end of the magnetic guide ring is connected to the first end cover through the magnetic isolation ring, and the other end of the magnetic guide ring is connected to the second end cover. The magnetic guide ring has a step, and the step, the magnetic guide ring, and the first end cover combine to form an annular groove. The excitation coil is sleeved in the annular groove.

[0010] Preferably, one end of the magnetic shielding ring is interference-fitted with the first end cap through a first protrusion structure, and the other end of the magnetic shielding ring is interference-fitted with the magnetic guide ring through a second protrusion structure, and the magnetic shielding ring is flush with the step.

[0011] Preferably, the first end cover is connected to the input shaft and the second end cover is connected to the controlled shaft by bearings and oil seals, and the first end cover is fixed to the cylinder, the second end cover is fixed to the cylinder, and the magnetic ring is fixed to the second end cover by bolts.

[0012] Preferably, the first end cover, the first brake disc, the cylinder, the second brake disc, and the magnetic ring are all made of magnetically conductive material, and the input shaft, the magnetic shielding ring, the second end cover, the return structure, and the controlled shaft are all made of magnetically shielding material. Preferably, the return structure is a telescopic spring structure. Preferably, the first end cover, the first brake disc, the second brake disc, the return structure, and the second end cover are arranged sequentially from left to right, and the central axes of the input shaft, the cylinder, the first end cover, the first brake disc, the magnetizing component, the second brake disc, the second end cover, and the controlled shaft are all located on the same straight line. Preferably, the first brake disc is provided with a first trapezoidal arc-shaped tooth, and the second brake disc is provided with a second trapezoidal arc-shaped tooth. The first trapezoidal arc-shaped tooth meshes with the second trapezoidal arc-shaped tooth so that the first brake disc and the second brake disc can transmit power. Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0013] Figure 1 A cross-sectional view of a magnetorheological brake with different operating modes in both forward and reverse rotation, provided for an embodiment of the present invention; Figure 2 This is a schematic diagram of the braking structure in the first state provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the braking structure provided in the second state according to an embodiment of the present invention; Figure 4 An exploded view of a magnetorheological brake with different operating modes in both forward and reverse rotation, provided as an embodiment of the present invention.

[0014] Explanation of key component symbols: 11. Cylinder; 12. First end cover; 13. Second end cover; 21. First brake disc; 22. Second brake disc; 23. Magnetic isolation ring; 24. Excitation coil; 25. Magnetic guide ring; 251. Step; 30. Return structure; 40. Input shaft; 50. Controlled shaft.

[0015] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0016] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0017] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] Please see Figures 1 to 4 The present invention provides a magnetorheological brake with different working modes for forward and reverse rotation, comprising a mounting housing, a braking structure, and a return structure 30.

[0020] The mounting housing includes a cylinder 11, a first end cover 12, and a second end cover 13. The openings at both ends of the cylinder 11 are covered by the first end cover 12 and the second end cover 13. The first end cover 12 and the cylinder 11, and the second end cover 13 and the cylinder 11 are fixed by bolts, so that the cylinder 11, the first end cover 12, and the second end cover 13 form a closed space. The braking structure and the return structure 30 are both located in the closed space. The braking structure includes a first brake disc 21, a second brake disc 22, and a magnetizing component. The first brake disc 21 has a first trapezoidal arc-shaped tooth, and the second brake disc 22 has a second trapezoidal arc-shaped tooth. The first and second trapezoidal arc-shaped teeth mesh to enable power transmission between the first brake disc 21 and the second brake disc 22. The first brake disc 21 is sleeved on the input shaft 40, and the second brake disc 22 is sleeved on the controlled shaft 50. The right end face of the flange of the input shaft 40 is fixedly connected to the left end face of the first brake disc 21 by a screw structure. The center of the first end cover 12 and the second end cover 13 are both provided with a round hole. The input shaft 40 passes through the round hole of the first end cover 12. The magnetizing component is sleeved on the outside of the first brake disc 21 and the second brake disc 22. The magnetizing component is used to generate a magnetic field. The magnetizing component includes a magnetic shielding ring 23, an excitation coil 24, and a magnetic guide ring 25. The magnetic guide ring 25 is sleeved between the braking structure and the cylinder 11. One end of the magnetic guide ring 25 is connected to the first end cover 12 through the magnetic shielding ring 23, and the other end of the magnetic guide ring 25 is connected to the second end cover 13. The magnetic guide ring 25 is connected to the second end cover 13 by a bolt structure. The magnetic guide ring 25 has a step 251. The step 251, the magnetic guide ring 25, and the first end cover 12 combine to form an annular groove. The excitation coil 24 is wound in the annular groove. The step 251 is flush with the magnetic shielding ring 23. The return structure 30 is sleeved on the controlled shaft 50. One end of the return structure 30 is connected to the end face of the second brake disc 22 away from the first brake disc 21, and the other end of the return structure 30 is connected to the controlled shaft 50 through a limiting block. The controlled shaft 50 and the input shaft 40 do not interfere with each other. The controlled shaft 50 is connected to the second brake disc 22 through a receiving boss. The receiving boss is machined on the outer circumference of the controlled shaft 50, so that the second brake disc 22 and the controlled shaft 50 rotate synchronously and can also perform axial translation. It should be noted that in this embodiment, the return structure 30 is a telescopic spring structure.

[0021] In this embodiment, a radial damping gap is formed between the first end cap 12 and the first brake disc 21. The magnetic ring 25, the first brake disc 21 and the second brake disc 22 can form at least one of the first axial damping gap, the second axial damping gap and the third axial damping gap according to the different directions of the input shaft 40.

[0022] Specifically, when the input shaft 40 rotates forward, the trapezoidal arc teeth of the first brake disc 21 and the second brake disc 22 mesh, and the first brake disc 21 and the second brake disc 22 will rotate simultaneously, forming a first axial damping gap between the first brake disc 21 and the second brake disc 22. When braking is required, the input shaft 40 rotates forward, and the excitation coil 24 is energized with current to generate a magnetic field. The magnetic field passes perpendicularly through the radial damping gap and the first axial damping gap. The magnetorheological fluid in the first axial damping gap is subjected to the magnetic field to generate a magnetorheological effect, thereby outputting braking torque through the shear working mode. When the input shaft 40 reverses, the first brake disc 21 rotates, and the first trapezoidal arc-shaped teeth of the first brake disc 21 push the second trapezoidal arc-shaped teeth of the second brake disc 22, causing the second brake disc 22 to translate to the right. At this time, a second axial damping gap is formed between the first brake disc 21 and the magnetic ring 25. The return structure 30 is under pressure when the second brake disc 22 translates to the right, so that the second brake disc 22 can translate to the left when the first brake disc 21 rotates to the meshing position of the first and second trapezoidal arc-shaped teeth. A third axial damping gap is formed between the second brake disc 22 and the magnetic ring 25, and the second brake disc 22 is affected by the left and right movement of the second brake disc 22. Due to the influence of the magnetic field, the magnetorheological fluid in the third axial damping gap operates in a shear valve mode. When braking is required, current is passed through the excitation coil 24 to generate a magnetic field. The magnetic field passes perpendicularly through the radial damping gap, the second axial damping gap, and the third axial damping gap. The magnetorheological fluid in the damping gap is subjected to the magnetic field and generates a magnetorheological effect, thereby outputting braking torque. Specifically, the first brake disc 21 outputs braking torque through the radial damping gap and the second axial damping gap in a shear valve mode, and the second brake disc 22 outputs braking torque by moving left and right to make the third axial damping gap form a shear valve mode.

[0023] In this embodiment, a bearing structure and an oil seal structure are provided between the first end cover 12 and the input shaft 40. The controlled shaft 50 passes through the circular hole of the second end cover 13, and a bearing structure and an oil seal structure are provided between the second end cover 13 and the controlled shaft 50. Specifically, the first end cover 12 is connected to the input shaft 40 through the bearing structure, and then the first end cover 12 and the input shaft 40, and the second end cover 13 and the controlled shaft 50 are sealed with oil through the oil seal structure. The second end cover 13 is connected to the controlled shaft 50 through the bearing structure, and then the second end cover 13 and the controlled shaft 50 are sealed with oil through the oil seal structure. It should be noted that the bearing structure and the oil seal structure are both existing technologies, so they will not be described in detail here.

[0024] In this embodiment, the cylinder 11, the first end cover 12, the second end cover 13, the first brake disc 21, the second brake disc 22, the magnetic ring 25, the magnetic isolation ring 23, the excitation coil 24, the return structure 30, and the central axis of the controlled shaft 50 are all located on the same straight line, and the first end cover 12, the first brake disc 21, the second brake disc 22, the return structure 30, and the second end cover 13 are arranged sequentially from left to right.

[0025] In this embodiment, one end of the magnetic shielding ring 23 is interference-fitted with the first end cap 12 through a first protrusion structure, and the other end of the magnetic shielding ring 23 is interference-fitted with the magnetic guide ring 25 through a second protrusion structure. The first protrusion structure and the second protrusion structure have the same structure. Specifically, the first protrusion structure includes a connecting boss and a connecting groove. The connecting boss and the connecting groove are adapted to each other. The connecting boss is connected to the first end cap 12 or the second end cap 13. The connecting groove is provided on the magnetic shielding ring 23. Through the interference fit between the connecting boss and the connecting groove, the first end cap 12 is connected to the magnetic shielding ring 23, and the second end cap 13 is connected to the magnetic shielding ring 23. In this embodiment, the first end cover 12, the first brake disc 21, the cylinder 11, the second brake disc 22 and the magnetic ring 25 are all made of magnetic material, and the input shaft 40, the magnetic shielding ring 23, the second end cover 13, the return structure 30 and the controlled shaft 50 are all made of magnetic shielding material.

[0026] In specific implementation, the cylinder 11, the first end cover 12, and the second end cover 13 are combined to form a closed space. The braking structure and the return structure 30 are placed in the closed space. Then, the first brake disc 21 and the second brake disc 22 of the braking structure are engaged for transmission. The first brake disc 21 and the second brake disc 22 are respectively sleeved on the input shaft 40 and the controlled shaft 50. The magnetizing component of the braking structure is sleeved on the outside of the first brake disc 21 and the second brake disc 22. The return structure 30 is sleeved on the controlled shaft 50. One end of the return structure 30 is connected to the second brake disc 22, and the other end of the return structure 30 is connected to the controlled shaft 50 through a limiting block. The second brake disc 22 is also connected to the controlled shaft 50. By controlling the direction of the input shaft 40, the output braking torque range of the magnetorheological brake can be changed. This allows for different working modes with different output braking torques under the same magnetorheological brake. At the same time, it can also increase the adjustable range of braking torque and increase the service life of the magnetorheological brake.

[0027] It should be noted that the above implementation process is only to illustrate the feasibility of this application, but it does not mean that the magnetorheological brake with different working modes in forward and reverse rotation of this application has only the above-mentioned single implementation process. On the contrary, as long as the magnetorheological brake with different working modes in forward and reverse rotation of this application can be implemented, it can be included in the feasible implementation scheme of this application.

[0028] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A magnetorheological brake with different operating modes in both forward and reverse rotation, characterized in that, This includes the mounting housing, braking structure, and return structure; The mounting housing includes a cylinder, a first end cover, and a second end cover. The cylinder, the first end cover, and the second end cover are combined to form a closed space. The braking structure and the return structure are both located in the closed space. The braking structure includes a first brake disc, a second brake disc, and a magnetizing element. The first brake disc and the second brake disc engage in transmission. The first brake disc and the second brake disc are respectively sleeved on the input shaft and the controlled shaft. The magnetizing element is sleeved on the outside of the first brake disc and the second brake disc and is used to generate a magnetic field. The return structure is sleeved on the controlled shaft, and one end of the return structure is connected to the controlled shaft through a limiting block, while the other end of the return structure is connected to the second brake disc. A radial damping gap is formed between the first end cap and the first brake disc, and at least one of a first axial damping gap, a second axial damping gap, and a third axial damping gap is formed between the magnetizing component, the first brake disc, and the second brake disc according to the different directions of the input shaft.

2. A magnetorheological brake with different operating modes in both forward and reverse rotation according to claim 1, characterized in that, The magnetizing component includes a magnetic isolation ring, an excitation coil, and a magnetic guide ring. The magnetic guide ring is disposed between the braking structure and the cylinder. One end of the magnetic guide ring is connected to the first end cover through the magnetic isolation ring, and the other end of the magnetic guide ring is connected to the second end cover. The magnetic guide ring has a step, and the step, the magnetic guide ring, and the first end cover combine to form an annular groove. The excitation coil is sleeved in the annular groove.

3. A magnetorheological brake with different operating modes in both forward and reverse rotation according to claim 2, characterized in that, One end of the magnetic shielding ring is interference-fitted with the first end cap through a first protrusion structure, and the other end of the magnetic shielding ring is interference-fitted with the magnetic conductor ring through a second protrusion structure. The magnetic shielding ring is flush with the step.

4. A magnetorheological brake with different operating modes in both forward and reverse rotation according to claim 2, characterized in that, The first end cover is connected to the input shaft and the second end cover is connected to the controlled shaft by bearings and oil seals. The first end cover is fixed to the cylinder, the second end cover is fixed to the cylinder, and the magnetic ring is fixed to the second end cover by bolts.

5. A magnetorheological brake with different operating modes in both forward and reverse rotation according to claim 2, characterized in that, The first end cover, the first brake disc, the cylinder, the second brake disc, and the magnetic ring are all made of magnetically conductive material, and the input shaft, the magnetic shielding ring, the second end cover, the return structure, and the controlled shaft are all made of magnetically shielding material.

6. A magnetorheological brake with different operating modes in both forward and reverse rotation according to claim 1, characterized in that, The return structure is a telescopic spring structure.

7. A magnetorheological brake with different operating modes in both forward and reverse rotation according to claim 1, characterized in that, The first end cap, the first brake disc, the second brake disc, the return structure, and the second end cap are arranged sequentially from left to right. The central axes of the input shaft, the cylinder, the first end cap, the first brake disc, the magnetizing component, the second brake disc, the second end cap, and the controlled shaft are all located on the same straight line.

8. A magnetorheological brake with different operating modes in both forward and reverse rotation according to claim 1, characterized in that, The first brake disc is provided with a first trapezoidal arc-shaped tooth, and the second brake disc is provided with a second trapezoidal arc-shaped tooth. The first trapezoidal arc-shaped tooth meshes with the second trapezoidal arc-shaped tooth so that the first brake disc and the second brake disc can transmit power.

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