Magnetorheological brake with large-torque braking function

Abstract

The utility model discloses a large-torque braking magneto-rheological brake, which comprises a main shaft, a hub and a bearing seat which are respectively arranged on the main shaft, a left magnetic conductive ring and a right magnetic conductive ring which are arranged on the bearing seat, a shell and a magnetic isolation cylinder which is arranged at the outer end parts of the left magnetic conductive ring and the right magnetic conductive ring, a plurality of main brake discs are installed on the outer edge of the hub, a plurality of auxiliary brake discs matched with the main brake discs at intervals in an inserted mode are installed on the inner wall of the magnetism isolating cylinder, the main brake discs and the auxiliary brake discs are both in a sawtooth shape, the left magnetic conductive ring, the magnetism isolating cylinder, the right magnetic conductive ring and the hub are matched to form a sealed cavity, and magnetorheological fluid is contained in the sealed cavity. The shell is arranged on the main shaft in a sleeving mode and located on the outer sides of the left magnetic conductive ring, the magnetic isolation cylinder and the right magnetic conductive ring, magnet exciting coils are arranged between the shell and the left magnetic conductive ring, between the shell and the magnetic isolation cylinder and between the shell and the right magnetic conductive ring, and the magnet exciting coils are controlled by independent power sources respectively. The brake device is high in magnetic induction intensity, large in brake torque and rapid in response, and has a large torque adjusting range and a flexible control function.

Description

Technical Field

[0001] This utility model relates to the field of magnetorheological brakes, specifically to a magnetorheological brake for high-torque braking. Background Technology

[0002] Magnetorheological fluids, discovered in the 20th century, are smart materials belonging to the category of controllable fluids. They are widely used due to their low energy consumption, extremely short response time, and the excellent space utilization of the mechanical equipment they produce. Magnetorheological brakes utilize the characteristic that magnetorheological fluids can change their rheological properties under the influence of a magnetic field to create superior braking devices. Compared to traditional hydraulic braking systems, magnetorheological brakes offer faster response times, controllable braking torque output, fewer system components, simpler braking mechanisms, and frictionless braking performance, resulting in better stability. However, when magnetorheological brakes are used to transmit large torques, insufficient braking torque often occurs. Summary of the Invention

[0003] To address the problems existing in the prior art, this utility model provides a magnetorheological brake for high torque braking.

[0004] To achieve the above objectives, this utility model employs a magnetorheological brake with high torque braking, comprising a main shaft, a hub and a bearing seat respectively mounted on the main shaft, a left magnetic guide ring and a right magnetic guide ring mounted on the bearing seat, and a housing and a magnetic shielding cylinder mounted on the outer ends of the left and right magnetic guide rings.

[0005] Multiple main brake discs are installed on the outer edge of the hub, and multiple auxiliary brake discs that are spaced and interlocked with the main brake discs are installed on the inner wall of the magnetic shielding cylinder. Both the main brake discs and the auxiliary brake discs are sawtooth-shaped. The left magnetic guide ring, the magnetic shielding cylinder, the right magnetic guide ring and the hub cooperate to form a sealed cavity, which is filled with magnetorheological fluid.

[0006] The housing is mounted on the main shaft and located outside the left magnetic guide ring, the magnetic shielding cylinder and the right magnetic guide ring. Excitation coils are provided between the housing and the left magnetic guide ring, the magnetic shielding cylinder and the right magnetic guide ring, and each excitation coil is controlled by an independent power supply.

[0007] As an improvement, the hub is connected to the main shaft via a flat key, and the two bearing seats are symmetrically mounted on the main shaft via bearings.

[0008] As an improvement, the housing includes a left end cover, a sleeve, and a right end cover. A left excitation coil is installed between the left end cover and the left magnetic ring, and a right excitation coil is installed between the right end cover and the right magnetic ring. An external excitation coil is installed between the sleeve and the magnetic isolation cylinder, the left magnetic ring, and the right magnetic ring.

[0009] As an improvement, the left end cap and the right end cap are respectively connected to the sleeve by bolts.

[0010] As an improvement, the left and right excitation coils are radially wound.

[0011] As an improvement, end face sealing rings are respectively installed between the left end cover and the right end cover and the main shaft.

[0012] As an improvement, a magnetic shielding ring is installed between the auxiliary brake disc and the outer edge of the wheel hub.

[0013] As an improvement, a sealing ring is installed between the bearing housing and the hub.

[0014] As an improvement, the main brake disc is connected to the wheel hub via a spline, and the auxiliary brake disc is connected to the magnetic shielding cylinder via a spline.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] (1) It adopts a sawtooth main brake disc and a sawtooth auxiliary brake disc. The working gap is sawtooth-shaped. Under the same volume, the working gap is increased and the braking torque is increased, which is suitable for applications that require high torque.

[0017] (2) By controlling the current magnitude of multiple excitation coils, the magnetic flux density of the magnetic field can be steplessly adjusted, thereby steplessly adjusting the braking torque of the brake and improving the applicability of the brake. Each excitation coil is controlled by an independent power supply and adopts an independent control strategy, which improves the flexibility of magnetic field adjustment, improves the stability of the system, reduces power waste, and reduces energy consumption.

[0018] (3) The simple housing structure makes the excitation coil easy to disassemble and maintain, reducing maintenance costs and improving the reliability of the brake. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the main brake disc of this utility model;

[0021] In the diagram: 1. Main shaft, 2. End face seal ring, 3. Bearing, 4. Left excitation coil, 5. Left end cover, 6. Magnetic isolation ring, 7. Left magnetic guide ring, 8. External excitation coil, 9. Auxiliary brake disc, 10. Main brake disc, 11. Magnetic isolation cylinder, 12. Sleeve, 13. Right excitation coil, 14. Right end cover, 15. Hub, 16. Seal ring, 17. Right magnetic guide ring, 18. Magnetorheological fluid. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other.

[0023] like Figure 1 , Figure 2 As shown, a magnetorheological brake for high torque braking includes a main shaft 1, a hub 15 and a bearing seat respectively mounted on the main shaft 1. There are two bearing seats, which are symmetrically arranged on the main shaft 1. A left magnetic guide ring 7 and a right magnetic guide ring 17 are respectively mounted on the two bearing seats. The brake also includes a housing and a magnetic shielding cylinder 11 installed at the outer ends of the left magnetic guide ring 7 and the right magnetic guide ring 17.

[0024] Multiple main brake discs 10 are installed on the outer edge of the hub 15, and multiple auxiliary brake discs 9 are installed on the inner wall of the magnetic shielding cylinder 11, which are spaced apart and interlocked with the main brake discs 10. Both the main brake discs 10 and the auxiliary brake discs 9 are sawtooth-shaped. The sawtooth-shaped main brake discs 10 and the sawtooth-shaped auxiliary brake discs 9 cooperate to form a sawtooth-shaped braking working gap. Under the same volume, the friction area is increased, the heat dissipation performance is improved, and it also helps to reduce vibration and noise, thus meeting the application requirements of high torque.

[0025] The left magnetic guide ring 7, the magnetic shielding cylinder 11, the right magnetic guide ring 17 and the hub 15 cooperate to form a sealed cavity, which is filled with magnetorheological fluid 18. The magnetorheological fluid 18 fills the gap between the main brake disc 10 and the auxiliary brake disc 9, and the gap between the auxiliary brake disc 9 and the left magnetic guide ring 7 and the right magnetic guide ring 17.

[0026] The housing is mounted on the main shaft 1 and located outside the left magnetic ring 7, the magnetic shielding cylinder 11, and the right magnetic ring 17. Excitation coils are provided between the housing and the left magnetic ring 7, the magnetic shielding cylinder 11, and the right magnetic ring 17. Each excitation coil is controlled by an independent power supply. The independent control strategy improves the flexibility of magnetic field adjustment, enhances system stability, reduces power waste, and lowers energy consumption.

[0027] As an improved embodiment, such as Figure 1 As shown, the hub 15 is connected to the main shaft 1 via a flat key, making installation convenient; the two bearing seats are respectively mounted on the main shaft 1 via bearings 3, meeting the performance requirements.

[0028] As an improved embodiment, such as Figure 1As shown, the housing includes a left end cover 5, a sleeve 12, and a right end cover 14. The right side of the left end cover 5 has a groove containing a left excitation coil 4, which is fixed by the left end cover 5 and a left magnetic guide ring 7. The left end cover 14 has a groove on its left side containing a right excitation coil 13, which is fixed by the right end cover 14 and a right magnetic guide ring 17. The inner wall of the sleeve 12 has a groove containing an external excitation coil 8, which is fixed by the sleeve 12 to the magnetic isolation cylinder 11, the left magnetic guide ring 7, and the right magnetic guide ring 17. This magnetorheological brake has three excitation coils. By controlling the current in the three excitation coils, the magnetic flux density can be steplessly adjusted, thereby steplessly adjusting the braking torque of the brake and improving its applicability.

[0029] As an improved embodiment, such as Figure 1 As shown, the left end cover 5 and the right end cover 14 are respectively connected to the sleeve 12 by bolts. The housing structure is simple in design, which makes the excitation coil easy to disassemble and maintain, and reduces maintenance costs.

[0030] As an improved embodiment, the left excitation coil 4 and the right excitation coil 13 are respectively radially wound to generate an axial magnetic field; the left and right excitation coils and the external excitation coil 8 are independently controlled and can be arranged in multiple groups to meet the needs of different working conditions.

[0031] As an improved embodiment, such as Figure 1 As shown, end face sealing rings 2 are respectively installed between the left inner wall of the left end cover 5 and the right inner wall of the right end cover 14 and the main shaft 1 to prevent the intrusion of pollutants and impurities, which helps to protect the internal components of the brake and extend the service life of the brake.

[0032] As an improved embodiment, such as Figure 1 As shown, a magnetic shielding ring 6 is installed between the auxiliary brake disc 9 and the outer edge of the wheel hub 15. The magnetic shielding ring 6 optimizes the distribution of the magnetic field inside the brake, reduces the influence of magnetic leakage, and shields the interference of external magnetic fields.

[0033] As an improved embodiment, such as Figure 1 As shown, a sealing ring 16 is installed between the bearing housing and the hub 15. The sealing ring 16 enables the left magnetic guide ring 7, the magnetic shielding cylinder 11, the right magnetic guide ring 17 and the hub 15 to cooperate to form a sealed cavity, which improves the sealing performance of the overall structure and prevents the magnetorheological fluid 18 from leaking out.

[0034] As an improved embodiment, the main brake disc 10 is connected to the wheel hub 15 via a spline, and the auxiliary brake disc 9 is connected to the magnetic shielding cylinder 11 via a spline, resulting in a stable connection.

[0035] The working principle of the magnetorheological brake for high-torque braking of this utility model is as follows:

[0036] Cables are introduced through the wiring channel to independently power and control the left excitation coil 4, right excitation coil 13, and external excitation coil 8, generating a strong magnetic field. The magnetic field lines pass perpendicularly through the left magnetic guide ring 7 and the right magnetic guide ring 17, acting on the magnetorheological fluid 18 in the gap between the sawtooth main brake disc 10 and the sawtooth auxiliary brake disc 9. This causes the magnetorheological fluid 18 to change from a Newtonian fluid state without an applied magnetic field to a Bingham fluid state after an applied magnetic field, thereby generating a large yield tangential stress. This results in a large frictional force between the sawtooth main brake disc 10 and the sawtooth auxiliary brake disc 9, ultimately driving the wheel hub 15 and the main shaft 1 keyed to the wheel hub 15 to achieve braking and stopping.

[0037] This invention relates to a magnetorheological brake for high-torque braking, which has high magnetic induction intensity, large braking torque, rapid response, and a large torque adjustment range and flexible control function, and has broad application prospects.

[0038] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this utility model and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

Claims

1. A magnetorheological brake for high-torque braking, comprising a main shaft (1), a hub (15) respectively mounted on the main shaft (1), and a bearing housing, wherein a left magnetic guide ring (7) and a right magnetic guide ring (17) are mounted on the bearing housing, characterized in that, It also includes a housing and a magnetic shielding cylinder (11) installed at the outer ends of the left magnetic ring (7) and the right magnetic ring (17); Multiple main brake discs (10) are installed on the outer edge of the hub (15), and multiple auxiliary brake discs (9) that are spaced and interlocked with the main brake discs (10) are installed on the inner wall of the magnetic shielding cylinder (11). Both the main brake discs (10) and the auxiliary brake discs (9) are sawtooth-shaped. The left magnetic guide ring (7), the magnetic shielding cylinder (11), the right magnetic guide ring (17) and the hub (15) cooperate to form a sealed cavity, and the sealed cavity is filled with magnetorheological fluid (18). The housing is mounted on the main shaft (1) and located outside the left magnetic ring (7), the magnetic shielding cylinder (11) and the right magnetic ring (17). Excitation coils are provided between the housing and the left magnetic ring (7), the magnetic shielding cylinder (11) and the right magnetic ring (17), and each excitation coil is controlled by an independent power supply.

2. The magnetorheological brake for high-torque braking according to claim 1, characterized in that, The hub (15) is connected to the main shaft (1) via a flat key, and the two bearing seats are symmetrically mounted on the main shaft (1) via bearings (3).

3. A magnetorheological brake for high-torque braking according to claim 1, characterized in that, The housing includes a left end cover (5), a sleeve (12) and a right end cover (14). A left excitation coil (4) is installed between the left end cover (5) and the left magnetic ring (7). A right excitation coil (13) is installed between the right end cover (14) and the right magnetic ring (17). An external excitation coil (8) is installed between the sleeve (12) and the magnetic shielding cylinder (11), the left magnetic ring (7) and the right magnetic ring (17).

4. A magnetorheological brake for high-torque braking according to claim 3, characterized in that, The left end cap (5) and the right end cap (14) are respectively connected to the sleeve (12) by bolts.

5. A magnetorheological brake for high-torque braking according to claim 3, characterized in that, The left excitation coil (4) and the right excitation coil (13) are radially wound.

6. A magnetorheological brake for high-torque braking according to claim 3, characterized in that, The left end cover (5) and the right end cover (14) are respectively equipped with end face sealing rings (2) between the main shaft (1).

7. A magnetorheological brake for high-torque braking according to claim 1, characterized in that, A magnetic shielding ring (6) is installed between the auxiliary brake disc (9) and the outer edge of the wheel hub (15).

8. A magnetorheological brake for high-torque braking according to claim 1, characterized in that, A sealing ring (16) is installed between the bearing housing and the hub (15).

9. A magnetorheological brake for high-torque braking according to claim 1, characterized in that, The main brake disc (10) is connected to the wheel hub (15) via a spline, and the auxiliary brake disc (9) is connected to the magnetic shielding cylinder (11) via a spline.

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