Magnetic gear transmission mechanism capable of reducing axial suction

Abstract

The utility model discloses a magnetic gear transmission mechanism capable of reducing axial attraction, which comprises a driving magnetic wheel disc assembly, a driven magnetic wheel disc assembly, a magnetic grid adjusting device assembly, a magnetic resistance device assembly and a base assembly, and the driving magnetic wheel disc assembly and the driven magnetic wheel disc assembly are both rotatably connected with the base assembly. The magnetic grid adjusting device assembly is fixedly connected with the base assembly, and the driving magnetic wheel disc assembly and the driven magnetic wheel disc assembly are oppositely arranged on the two different sides of the magnetic grid adjusting device assembly respectively. The magnetic resistance device assembly comprises a first permanent magnet fixedly connected with the driving magnetic wheel disc assembly and a second permanent magnet fixedly connected with the driven magnetic wheel disc assembly, and repulsive force is generated between the first permanent magnet and the second permanent magnet to weaken or counteract axial magnetic attraction force between the driving magnetic wheel disc assembly and the driven magnetic wheel disc assembly. The starting and running performance of the magnetic gear can be effectively improved, and the energy transmission efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of contactless magnetic transmission, in particular to a magnetic gear transmission mechanism capable of reducing axial suction force. Background Art

[0002] Magnetic gear transmission technology is developed on the basis of magnetic theory. It realizes contactless transmission of force or torque through magnetic action. There are two main structural forms: axial magnetic gear transmission mechanism and radial magnetic gear transmission mechanism. The master and slave magnetic wheels of the axial magnetic gear transmission mechanism are not directly connected. When the load torque is greater than the maximum value of the transmission torque, the magnetic wheel transmission slips without any mechanical damage. It has the characteristics of no wear, overload self-protection, and zero leakage.

[0003] In the process of transmitting torque, the axially magnetized magnetic gear has a large axial magnetic attraction between the two magnetic wheels, and the magnetic wheel is connected to the base through a bearing. The axial magnetic attraction acting on the magnetic wheel will cause the bearing to bear axial force during operation, resulting in considerable friction during the rotation of the magnetic wheel, which not only affects the energy transfer efficiency, but also causes deformation and wear of the bearing. In addition, the smaller the air gap between the magnetic wheel and the magnetic adjustment grid, the greater the magnetic flux density, the greater the axial magnetic attraction, and the more friction loss, which will seriously affect the energy transfer efficiency of the magnetic gear. Therefore, it is necessary to take technical measures to weaken or offset this axial magnetic attraction, which can effectively improve the starting and running performance of the magnetic gear and improve the energy transfer efficiency.

[0004] At present, there are two main methods for reducing the axial magnetic attraction of magnetic gear transmission mechanisms: one is to use bearings with low friction coefficients to reduce the energy loss caused by friction; the other is to improve the machining accuracy of parts and the flatness of contact surfaces to reduce eccentricity errors and friction losses. However, these methods can only reduce friction losses to a certain extent, and there are adjustment limits. They cannot fundamentally change the current situation of large axial magnetic attraction, so that magnetic gear transmission mechanisms can only be used in low-power applications.

[0005] CM02158160U discloses a new type of transverse magnetic field magnetic transmission gear pair, the driving wheel and the driven wheel of the magnetic transmission gear pair are in the shape of flat discs, and 2p r There are 2p permanent magnets on the driving wheel and 2p on the driven wheel. sA driven wheel permanent magnet, a ferromagnetic magnetic adjustment grid for modulating the air gap magnetic field is installed between the driving wheel and the driven wheel, and there are air gaps between the ferromagnetic magnetic adjustment grid and the end faces of the driving wheel and the driven wheel. There is no mechanical contact and friction between the three and they are coaxially distributed. The air gap magnetic field Bg passes through the air gap plane along a route parallel to the rotation axis to form a transverse magnetic field of the magnetic transmission gear pair. When working, the principle of attraction between the N pole and the S pole of the permanent magnetic material is used to realize non-mechanical contact and frictionless power transmission. Undoubtedly, the technical solution disclosed in the above patent document is a beneficial attempt in the technical field, but the magnetic transmission gear pair is not designed with a structure to weaken the axial magnetic attraction. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a magnetic gear transmission mechanism that can reduce axial suction, which can effectively improve the starting and operating performance of the magnetic gear, enhance energy transfer efficiency, and broaden application scenarios.

[0007] A magnetic gear transmission mechanism capable of reducing axial suction force in the utility model comprises an active magnetic wheel disc assembly, a driven magnetic wheel disc assembly, a magnetic adjustment grid device assembly, a magnetic resistance device assembly and a base assembly, wherein the active magnetic wheel disc assembly and the driven magnetic wheel disc assembly are both rotatably connected to the base assembly, the magnetic adjustment grid device assembly is fixedly connected to the base assembly, and the active magnetic wheel disc assembly and the driven magnetic wheel disc assembly are respectively arranged on different sides of the magnetic adjustment grid device assembly; the magnetic resistance device assembly comprises a first permanent magnet fixedly connected to the active magnetic wheel disc assembly and a second permanent magnet fixedly connected to the driven magnetic wheel disc assembly, the first permanent magnet and the second permanent magnet are positioned opposite to each other and a repulsive force is generated between the two to weaken or offset the axial magnetic suction force between the active magnetic wheel disc assembly and the driven magnetic wheel disc assembly.

[0008] Furthermore, both the first permanent magnet and the second permanent magnet are annular permanent magnets that are axially magnetized, and the magnetization directions of the first permanent magnet and the second permanent magnet are opposite.

[0009] Furthermore, the active magnetic wheel disk assembly includes a first magnetic yoke disk, a first transmission shaft and an active permanent magnet assembly; the active permanent magnet assembly includes N axially magnetized active permanent magnets arranged along the circumferential direction, and the magnetization directions of two adjacent active permanent magnets are opposite; the active permanent magnet assembly is arranged on the side of the first magnetic yoke disk facing the magnetic adjustment grid device assembly, and the first transmission shaft is arranged on the side of the first magnetic yoke disk facing away from the magnetic adjustment grid device assembly.

[0010] Furthermore, the first permanent magnet is fixedly connected to the first yoke disk, and the first permanent magnet is disposed around the outside of the active permanent magnet assembly.

[0011] Furthermore, the driven magnetic wheel assembly includes a second magnetic yoke disk, a second transmission shaft and a driven permanent magnet assembly; the driven permanent magnet assembly includes M axially magnetized driven permanent magnets arranged along the circumferential direction, and the magnetization directions of two adjacent driven permanent magnets are opposite; the driven permanent magnet assembly is arranged on the side of the second magnetic yoke disk facing the magnetic adjustment grid device assembly, and the second transmission shaft is arranged on the side of the second magnetic yoke disk facing away from the magnetic adjustment grid device assembly.

[0012] Furthermore, the second permanent magnet is fixedly connected to the second yoke disk, and the second permanent magnet is disposed around the outer side of the driven permanent magnet assembly.

[0013] Furthermore, the magnetic tuning grid device assembly includes a non-magnetic material skeleton and a magnetic tuning block assembly fixed on the non-magnetic material skeleton, and the magnetic tuning block assembly includes P magnetic tuning blocks arranged along the circumferential direction, where P=(N+M) / 2.

[0014] Furthermore, the P magnetic tuning blocks are all formed by stacking silicon steel sheets, and the stacking direction of the silicon steel sheets is perpendicular to the air gap magnetic field.

[0015] Further, when the magnetic gear transmission mechanism is used for increasing speed, N>M; when the magnetic gear transmission mechanism is used for decreasing speed, N<M.

[0016] Furthermore, the base assembly includes a non-magnetic material disc, a first base and a second base, the first base and the second base are respectively fixed on different sides of the non-magnetic material disc, the non-magnetic material disc is fixedly connected to the non-magnetic material skeleton, the first transmission shaft and the first base are rotatably connected via a bearing, and the second transmission shaft and the second base are rotatably connected via a bearing.

[0017] The beneficial effects of the utility model are:

[0018] (1) The first permanent magnet and the second permanent magnet of the utility model are positioned relative to each other and a repulsive force is generated between them. The force exerted on the first permanent magnet will be transmitted to the active magnetic wheel assembly, and the force exerted on the second permanent magnet will be transmitted to the driven magnetic wheel assembly, thereby weakening or offsetting the axial magnetic attraction between the active magnetic wheel assembly and the driven magnetic wheel assembly, reducing the friction force generated during the rotation of the active and driven magnetic wheel assemblies, and can effectively improve the starting and running performance of the magnetic gear, enhance the energy transfer efficiency, and broaden the application scenarios.

[0019] (2) The driving and driven magnetic wheels of the magnetic gear transmission mechanism of the utility model are not directly connected. When the load torque is greater than the maximum value of the transmission torque, the magnetic wheel transmission slips without causing any mechanical damage. It has the characteristics of no wear, overload self-protection, and zero leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is an exploded view of the utility model (the base assembly and the non-magnetic conductive material skeleton are hidden in the figure);

[0023] Figure 3 for Figure 1 Schematic diagram of the AA section.

[0024] The following are marked in the accompanying drawings:

[0025] 1-active magnetic wheel assembly, 11-first magnetic yoke disc, 12-first transmission shaft, 13-active permanent magnet;

[0026] 2-driven magnetic wheel assembly, 21-second magnetic yoke disc, 22-second transmission shaft, 23-driven permanent magnet;

[0027] 3-magnetic grid device assembly, 31-non-magnetic material skeleton, 32-magnetic adjustment block;

[0028] 4-magnetic resistance device assembly, 41-first permanent magnet, 42-second permanent magnet;

[0029] 5-base assembly, 51-non-magnetic material disc, 52-first base, 53-second base;

[0030] 6-Bearings. DETAILED DESCRIPTION

[0031] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] like Figure 1-Figure 3As shown, a magnetic gear transmission mechanism capable of reducing axial attraction in the present embodiment comprises an active magnetic wheel assembly 1, a driven magnetic wheel assembly 2, a magnetic grid device assembly 3, a magnetic resistance device assembly 4 and a base assembly 5, wherein the active magnetic wheel assembly 1 and the driven magnetic wheel assembly 2 are both rotatably connected to the base assembly 5, the magnetic grid device assembly 3 is fixedly connected to the base assembly 5, and the active magnetic wheel assembly 1 and the driven magnetic wheel assembly 2 are respectively arranged on different sides of the magnetic grid device assembly 3; the magnetic resistance device assembly 4 comprises a first permanent magnet 41 fixedly connected to the active magnetic wheel assembly 1 and a second permanent magnet 42 fixedly connected to the driven magnetic wheel assembly 2, the first permanent magnet 41 and the second permanent magnet 42 are positioned opposite to each other and a repulsive force is generated therebetween to weaken or offset the axial magnetic attraction between the active magnetic wheel assembly 1 and the driven magnetic wheel assembly 2. The first permanent magnet 41 and the second permanent magnet 42 are positioned relative to each other and a repulsive force is generated between them. The force exerted on the first permanent magnet 41 will be transmitted to the active magnetic wheel assembly 1, and the force exerted on the second permanent magnet 42 will be transmitted to the driven magnetic wheel assembly 2, thereby weakening or offsetting the axial magnetic attraction between the active magnetic wheel assembly 1 and the driven magnetic wheel assembly 2, reducing the friction generated during the rotation of the active and driven magnetic wheel assemblies 2, and can effectively improve the starting and running performance of the magnetic gear, improve the energy transfer efficiency, and broaden the application scenarios. In addition, the active and driven magnetic wheels of the magnetic gear transmission mechanism are not directly connected. When the load torque is greater than the maximum value of the transmission torque, the magnetic wheel transmission slips without causing any mechanical damage. It has the characteristics of no wear, overload self-protection, and zero leakage.

[0033] In this embodiment, the first permanent magnet 41 and the second permanent magnet 42 are both axially magnetized annular permanent magnets, and the magnetization directions of the first permanent magnet 41 and the second permanent magnet 42 are opposite. The annular permanent magnet can be an annular magnetic yoke back iron, and the annular permanent magnet is connected to the active magnetic wheel assembly 1 or the driven magnetic wheel assembly 2 through a non-magnetic material.

[0034] In this embodiment, the active magnetic wheel assembly 1 includes a first magnetic yoke disk 11, a first transmission shaft 12 and an active permanent magnet assembly; the active permanent magnet assembly includes N axially magnetized active permanent magnets 13 arranged along the circumferential direction, and the magnetization directions of two adjacent active permanent magnets 13 are opposite; the active permanent magnet assembly is arranged on the side of the first magnetic yoke disk 11 facing the magnetic grating device assembly 3, and the first transmission shaft 12 is arranged on the side of the first magnetic yoke disk 11 facing away from the magnetic grating device assembly 3. N is a positive integer greater than 3, such as 10, 30 or 50.

[0035] In this embodiment, the first permanent magnet 41 is fixedly connected to the first yoke disk 11 and is disposed around the outside of the active permanent magnet assembly. The first permanent magnet 41 surrounds the N active permanent magnets 13 of the active permanent magnet assembly, making the structure compact and improving space utilization.

[0036] In this embodiment, the driven magnetic wheel assembly 2 includes a second magnetic yoke disk 2, a second transmission shaft 22 and a driven permanent magnet assembly; the driven permanent magnet assembly includes M axially magnetized driven permanent magnets 23 arranged along the circumferential direction, and the magnetization directions of two adjacent driven permanent magnets 23 are opposite; the driven permanent magnet assembly is arranged on the side of the second magnetic yoke disk 2 facing the magnetic adjustment grid device assembly 3, and the second transmission shaft 22 is arranged on the side of the second magnetic yoke disk 2 facing away from the magnetic adjustment grid device assembly 3. M is a positive integer greater than 3, such as 10, 30 or 50.

[0037] In this embodiment, the second permanent magnet 42 is fixedly connected to the second yoke disk 2 and is disposed around the outside of the driven permanent magnet assembly. The second permanent magnet 42 surrounds the M driven permanent magnets 23 of the driven permanent magnet assembly, making the structure compact and improving space utilization.

[0038] In this embodiment, the magnetic tuning grid device assembly 3 includes a non-magnetic material skeleton 31 and a magnetic tuning block assembly fixed on the non-magnetic material skeleton 31. The magnetic tuning block assembly includes P magnetic tuning blocks 32 arranged along the circumferential direction, where P=(N+M) / 2.

[0039] In this embodiment, the P magnetic tuning blocks 32 are all formed by stacking silicon steel sheets, and the stacking direction of the silicon steel sheets is perpendicular to the air gap magnetic field.

[0040] In this embodiment, when the magnetic gear transmission mechanism is used for increasing speed, N>M; when the magnetic gear transmission mechanism is used for decreasing speed, N<M.

[0041] In this embodiment, the base assembly 5 includes a non-magnetic material disc 51, a first base 52 and a second base 53. The first base 52 and the second base 53 are respectively fixed on different sides of the non-magnetic material disc 51. The non-magnetic material disc 51 is fixedly connected to the non-magnetic material skeleton 31. The first transmission shaft 12 and the first base 52 are rotatably connected through the bearing 6. The second transmission shaft 22 and the second base 53 are rotatably connected through the bearing 6.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A magnetic gear transmission mechanism capable of reducing axial suction force, characterized in that: The invention comprises an active magnetic wheel disc assembly (1), a driven magnetic wheel disc assembly (2), a magnetic grating device assembly (3), a magnetic resistance device assembly (4) and a base assembly (5), wherein the active magnetic wheel disc assembly (1) and the driven magnetic wheel disc assembly (2) are both rotatably connected to the base assembly (5), the magnetic grating device assembly (3) is fixedly connected to the base assembly (5), and the active magnetic wheel disc assembly (1) and the driven magnetic wheel disc assembly (2) are respectively arranged relative to each other at the positions of the active magnetic wheel disc assembly (1) and the driven magnetic wheel disc assembly (2). The magnetic grating device assembly (3) is arranged on different sides; the magnetic resistance device assembly (4) comprises a first permanent magnet (41) fixedly connected to the active magnetic wheel assembly (1) and a second permanent magnet (42) fixedly connected to the driven magnetic wheel assembly (2), wherein the first permanent magnet (41) and the second permanent magnet (42) are positioned opposite to each other and a repulsive force is generated therebetween to weaken or offset the axial magnetic attraction between the active magnetic wheel assembly (1) and the driven magnetic wheel assembly (2).

2. The magnetic gear transmission mechanism capable of reducing axial suction force according to claim 1, characterized in that: The first permanent magnet (41) and the second permanent magnet (42) are both axially magnetized annular permanent magnets, and the magnetization directions of the first permanent magnet (41) and the second permanent magnet (42) are opposite.

3. The magnetic gear transmission mechanism capable of reducing axial suction force according to claim 2, characterized in that: The active magnetic wheel disk assembly (1) comprises a first magnetic yoke disk (11), a first transmission shaft (12) and an active permanent magnet assembly; the active permanent magnet assembly comprises N axially magnetized active permanent magnets (13) arranged along the circumferential direction, and the magnetization directions of two adjacent active permanent magnets (13) are opposite; the active permanent magnet assembly is arranged on a side of the first magnetic yoke disk (11) facing the magnetic grating device assembly (3), and the first transmission shaft (12) is arranged on a side of the first magnetic yoke disk (11) facing away from the magnetic grating device assembly (3).

4. The magnetic gear transmission mechanism capable of reducing axial suction force according to claim 3, characterized in that: The first permanent magnet (41) is fixedly connected to the first yoke disk (11), and the first permanent magnet (41) is arranged around the outside of the active permanent magnet assembly.

5. The magnetic gear transmission mechanism capable of reducing axial suction force according to claim 3, characterized in that: The driven magnetic wheel assembly (2) comprises a second magnetic yoke disk (21), a second transmission shaft (22) and a driven permanent magnet assembly; the driven permanent magnet assembly comprises M axially magnetized driven permanent magnets (23) arranged in a circumferential direction, and the magnetization directions of two adjacent driven permanent magnets (23) are opposite; the driven permanent magnet assembly is arranged on a side of the second magnetic yoke disk (21) facing the magnetic adjustment grid device assembly (3), and the second transmission shaft (22) is arranged on a side of the second magnetic yoke disk (21) facing away from the magnetic adjustment grid device assembly (3).

6. The magnetic gear transmission mechanism capable of reducing axial suction force according to claim 5, characterized in that: The second permanent magnet (42) is fixedly connected to the second yoke disc (21), and the second permanent magnet (42) is arranged around the outside of the driven permanent magnet assembly.

7. The magnetic gear transmission mechanism capable of reducing axial suction force according to claim 6, characterized in that: The magnetic adjustment grid device assembly (3) comprises a non-magnetic material skeleton (31) and a magnetic adjustment block assembly fixed on the non-magnetic material skeleton (31), wherein the magnetic adjustment block assembly comprises P magnetic adjustment blocks (32) arranged along the circumferential direction, wherein P=(N+M) / 2.

8. The magnetic gear transmission mechanism capable of reducing axial suction force according to claim 7, characterized in that: The P magnetic adjustment blocks (32) are all formed by stacking silicon steel sheets, and the stacking direction of the silicon steel sheets is perpendicular to the air gap magnetic field.

9. The magnetic gear transmission mechanism capable of reducing axial suction force according to claim 7, characterized in that: When the magnetic gear transmission mechanism is used for increasing speed, N>M; when the magnetic gear transmission mechanism is used for decreasing speed, N<M.

10. The magnetic gear transmission mechanism capable of reducing axial suction force according to claim 7, characterized in that: The base assembly (5) comprises a non-magnetic material disc (51), a first base (52) and a second base (53); the first base (52) and the second base (53) are respectively fixed on different sides of the non-magnetic material disc (51); the non-magnetic material disc (51) is fixedly connected to the non-magnetic material skeleton (31); the first transmission shaft (12) and the first base (52) are rotatably connected via a bearing (6); and the second transmission shaft (22) and the second base (53) are rotatably connected via a bearing (6).

Images