Non-contact torque transmission device with overload protection

Abstract

The invention provides a non-contact torque transmission device with an overload protection function, and belongs to the technical field of torque limiting transmission. The device comprises an outer rotor assembly, an inner rotor assembly matched with the outer rotor assembly, a transmission assembly connected with the inner rotor assembly and used for outputting transmission torque, and a supporting assembly used for fixedly supporting the outer rotor assembly and the transmission assembly. The outer rotor assembly comprises a hollow outer rotor shell and a hysteresis ring concentrically fixed to the inner side of the outer rotor shell, the inner rotor assembly comprises a permanent magnet set matched with the hysteresis ring, the hysteresis ring is in clearance fit with the inner rotor assembly, and a meshing structure meshed with a transmission input gear is arranged on the outer circle face of the outer rotor shell and used for inputting transmission torque. The inner rotor assembly is connected with the transmission assembly and used for transmitting the transmission torque. The device utilizes the hysteresis effect of the outer rotor and the inner rotor to generate hysteresis torque, realizes non-contact torque transmission and overload non-contact sliding, and is free of friction loss, high in reliability and long in service life.

Description

Technical Field

[0001] The invention belongs to the technical field of torque limiting transmission, and in particular provides a contactless torque transmission device with overload protection. Background Art

[0002] The electric trim actuator of the aircraft control system provides a trim function for the aircraft control force sensing system to reduce the physical exertion of the pilot. The power source of the electric trim actuator is the motor. When the trim button is pressed, the trim controller drives the motor to rotate. After the speed reducer and the electric trim actuator are transmitted, the sensing force system is trimmed. When the trim output reaches the output stroke limit position, the limit mechanism stops the output shaft and limits the output shaft movement. At this time, the motor power source needs to be disconnected to prevent the motor from stalling or overload damage. The prior art uses a friction torque limiter as an overload protection torque transmission method. After multiple slippage operations, the torque limit threshold becomes unstable due to wear, and is unstable at a small torque threshold, and the accuracy is not high. Either the torque threshold is reduced and the load cannot be driven normally, or the torque threshold is increased and the slip protection cannot be normal to protect the motor, so that the electric trim actuator cannot work normally, the reliability, life and maintainability are low, and it is difficult to meet the use requirements on the aircraft. Summary of the invention

[0003] The purpose of the present application is to address the deficiencies of existing overload protection torque transmission devices and to propose a contactless torque transmission device with overload protection. The device adopts the hysteresis effect of an outer rotor with hysteresis characteristics and an inner rotor with permanent magnets to generate the principle of hysteresis torque, thereby realizing non-contact torque transmission. In addition, the device has relatively no contact sliding and friction loss when overloaded, thus protecting the motor from stalling. The device has high reliability and long service life.

[0004] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a contactless torque transmission device with overload protection, the device comprising an outer rotor assembly, an inner rotor assembly matched with the outer rotor assembly, a transmission assembly connected to the inner rotor assembly for outputting transmission torque, and a support assembly for fixing and supporting the outer rotor assembly and the transmission assembly.

[0005] The outer rotor assembly comprises a hollow outer rotor housing and a hysteresis ring concentrically fixed to the inner side of the outer rotor housing, and the inner rotor assembly comprises a permanent magnet group matched with the hysteresis ring.

[0006] The hysteresis ring is clearance-matched with the inner rotor assembly,

[0007] The outer circumferential surface of the outer rotor housing is provided with a meshing structure that meshes with the transmission input gear for inputting the transmission torque.

[0008] The inner rotor assembly is connected to the transmission assembly for transmitting transmission torque.

[0009] The contactless torque transmission device with overload protection provided by the present invention also has the following technical features: one end of the outer rotor housing is provided with a plurality of circular arc convex segments for limiting the position of the hysteresis ring, and the plurality of circular arc convex segments are evenly distributed on the circumferential end surface of the outer rotor housing.

[0010] The outer circumferential surface of the hysteresis ring is concentric with the inner circumferential surface.

[0011] The contactless torque transmission device with overload protection provided by the present invention also has the following technical features: the meshing structure includes meshing teeth integrally arranged on the outer cylindrical surface or gears detachably mounted on the outer cylindrical surface.

[0012] The contactless torque transmission device with overload protection provided by the present invention also has the following technical features: the hysteresis ring is made of semi-hard magnetic hysteresis material, and the outer rotor housing is made of non-magnetic material.

[0013] The contactless torque transmission device with overload protection provided by the present invention also has the following technical features: the inner rotor assembly also includes a support frame for fixing the permanent magnet group and a sleeve arranged on the outer circle of the permanent magnet group for constraining the axial position of the permanent magnet group, and the support frame is connected to the transmission assembly.

[0014] The contactless torque transmission device with overload protection provided by the present invention also has the following technical features: the permanent magnet group includes an even number of evenly distributed permanent magnets, and the radial polarities of adjacent permanent magnets are opposite.

[0015] The contactless torque transmission device with overload protection provided by the present invention also has the following technical feature: the outer side surface of the support frame is provided with a plurality of planes corresponding to the inner side surface of each permanent magnet in the permanent magnet group.

[0016] The contactless torque transmission device with overload protection provided by the present invention also has the following technical features: the transmission assembly includes a gear shaft connected to the inner rotor assembly and a flat key for connecting the inner rotor assembly and the gear shaft.

[0017] The contactless torque transmission device with overload protection provided by the present invention also has the following technical features: the support assembly includes a support member for mounting and fixing the transmission assembly, a bearing for mounting the transmission assembly on the support member, and a rotating support member for supporting and connecting the outer rotor assembly with the transmission assembly.

[0018] The rotation support is used to constrain the axial position of the outer rotor assembly and ensure that the outer rotor assembly rotates coaxially relative to the transmission assembly.

[0019] The contactless torque transmission device with overload protection provided by the present invention also has the following technical features: the device also includes a first spacer ring for spacing the inner rotor assembly and the outer rotor assembly and a second spacer ring for spacing the inner rotor assembly and the support assembly.

[0020] Beneficial Effects

[0021] The contactless torque transmission device with overload protection provided by the present invention utilizes the hysteresis effect of the outer rotor and the inner rotor to generate hysteresis torque, thereby realizing non-contact torque transmission and overload contactless sliding, without friction loss, high reliability and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A half-section schematic diagram of an assembly of the transmission device provided by the present invention;

[0024] Figure 2 A schematic structural diagram of a 6-pole inner rotor assembly provided in an embodiment of the present invention;

[0025] Figure 3 A half-section schematic diagram of a three-pole inner rotor assembly provided by another embodiment of the present invention;

[0026] Figure 4 A schematic diagram of an outer shell provided by an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of a magnetic steel provided in an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of a six-pole inner rotor support frame provided in an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of a three-pole inner rotor support frame provided by another embodiment of the present invention;

[0030] Figure 8 A schematic diagram of the structure of a sleeve provided in an embodiment of the present invention;

[0031] Fig. 9 A cross-sectional view of an assembly of the transmission device provided by the present invention;

[0032] Fig.10 A schematic diagram of the structure of a hysteresis loop provided in an embodiment of the present invention,

[0033] Among them: 1: support; 2: outer rotor assembly; 2a: raised section; 3: hysteresis ring; 4: inner rotor assembly; 5: gear shaft; 6: rotating support; 7: first spacer ring; 8: flat key; 9: second spacer ring; 10: sleeve; 11: permanent magnet; 12: support frame; 13: bearing. DETAILED DESCRIPTION

[0034] The present application is further described in detail below in conjunction with the accompanying drawings and examples, but it should be noted that these implementation methods are not limitations of the present application, and equivalent changes or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these implementation methods are all within the scope of protection of the present application.

[0035] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the creation of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the creation of the present application.

[0036] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0037] The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of this application can be understood by specific circumstances.

[0038] like Figure 1-10As shown, an embodiment of the present application provides a contactless torque transmission device with overload protection, the device comprising an outer rotor assembly 2, an inner rotor assembly 4 cooperating with the outer rotor assembly 2, a transmission assembly connected to the inner rotor assembly 4 for outputting a transmission torque, and a support assembly for fixedly supporting the outer rotor assembly 2 and the transmission assembly, the outer rotor assembly 2 comprising a hollow outer rotor shell and a hysteresis ring 3 concentrically fixed to the inner side of the outer rotor shell, the inner rotor assembly 4 comprising a permanent magnet group cooperating with the hysteresis ring 3, the hysteresis ring 3 and the inner rotor assembly 4 having a clearance fit, the outer cylindrical surface of the outer rotor shell being provided with a meshing structure meshing with a transmission input gear for inputting a transmission torque, the inner rotor assembly 4 being connected to the transmission assembly for transmitting the transmission torque.

[0039] In some embodiments, one end of the outer rotor housing is provided with a plurality of arc convex segments 2a for limiting the position of the hysteresis ring, and the plurality of arc convex segments 2a are evenly distributed on the circumferential end surface of the outer housing, and the outer circumferential surface of the hysteresis ring 3 is concentric with the inner circumferential surface.

[0040] In some embodiments, the meshing structure includes meshing teeth integrally arranged on the outer surface or gears detachably mounted on the outer surface. The gears on the outer surface can be straight teeth, helical teeth, or gears capable of transmitting torque.

[0041] In some embodiments, the hysteresis ring 3 is made of semi-hard magnetic hysteresis material, and the outer rotor shell is made of non-magnetic material.

[0042] In some embodiments, the inner rotor assembly 4 further includes a support frame 12 for fixing the permanent magnet group and a sleeve 10 arranged on the outer circle of the permanent magnet group for constraining the axial position of the permanent magnet group, and the support frame 12 is connected to the transmission assembly.

[0043] In some embodiments, the permanent magnet group includes an even number of evenly distributed permanent magnets 11, and the radial polarities of adjacent permanent magnets 11 are opposite. When the outer diameter of the rotor assembly 4 is small, the number of pole pairs is as small as 3 pairs of poles, or even 2 pairs of poles or 1 pair of poles. When the outer diameter of the rotor assembly 4 is large, the number of pole pairs is increased to 6 pairs of poles, or even 8 pairs of poles or 10 pairs of poles. Specifically, under a given volume condition, the number of pole pairs maximizes the generated hysteresis torque.

[0044] In some embodiments, the outer side surface of the support frame 12 is provided with a plurality of planes corresponding to the inner side surface of each permanent magnet 11 in the permanent magnet group.

[0045] In some embodiments, the transmission assembly includes a gear shaft 5 connected to the inner rotor assembly 4 and a flat key 8 for connecting the inner rotor assembly 4 and the gear shaft 5 .

[0046] In some embodiments, the support assembly includes a support member 1 for mounting and fixing the transmission assembly, a bearing 13 for mounting the transmission assembly on the support member 1, and a rotating support member 6 for supporting and connecting the outer rotor assembly with the transmission assembly, wherein the rotating support member 6 is used to constrain the axial position of the outer rotor assembly and ensure that the outer rotor assembly rotates coaxially relative to the transmission assembly. The support member is a flange ball bearing or a copper ring.

[0047] In some embodiments, the device further comprises a first spacer ring 7 for spacing the inner rotor assembly and the outer rotor assembly, and a second spacer ring 9 for spacing the inner rotor assembly and the support assembly.

[0048] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A contactless torque transmission device with overload protection, characterized in that: The device comprises an outer rotor assembly, an inner rotor assembly matched with the outer rotor assembly, a transmission assembly connected to the inner rotor assembly for outputting transmission torque, and a support assembly for fixing and supporting the outer rotor assembly and the transmission assembly. The outer rotor assembly comprises a hollow outer rotor housing and a hysteresis ring concentrically fixed to the inner side of the outer rotor housing, and the inner rotor assembly comprises a permanent magnet group matched with the hysteresis ring. The hysteresis ring is clearance-matched with the inner rotor assembly, The outer circumferential surface of the outer rotor housing is provided with a meshing structure that meshes with the transmission input gear for inputting the transmission torque. The inner rotor assembly is connected to the transmission assembly for transmitting transmission torque.

2. The contactless torque transmission device with overload protection according to claim 1, characterized in that: One end of the outer rotor housing is provided with a plurality of arc convex segments for limiting the position of the hysteresis ring, and the plurality of arc convex segments are evenly distributed on the circumferential end surface of the outer rotor housing. The outer circumferential surface of the hysteresis ring is concentric with the inner circumferential surface.

3. The contactless torque transmission device with overload protection according to claim 1, characterized in that: The meshing structure includes meshing teeth integrally arranged on the outer cylindrical surface or gears detachably mounted on the outer cylindrical surface.

4. The contactless torque transmission device with overload protection according to claim 1, characterized in that: The hysteresis ring is made of semi-hard magnetic hysteresis material, and the outer rotor shell is made of non-magnetic material.

5. The contactless torque transmission device with overload protection according to claim 1, characterized in that: The inner rotor assembly also includes a support frame for fixing the permanent magnet group and a sleeve arranged on the outer circle of the permanent magnet group for constraining the axial position of the permanent magnet group. The support frame is connected to the transmission assembly.

6. The contactless torque transmission device with overload protection according to claim 5, characterized in that: The permanent magnet group includes an even number of evenly distributed permanent magnets, and the radial polarities of adjacent permanent magnets are opposite.

7. The contactless torque transmission device with overload protection according to claim 5, characterized in that: The outer side surface of the support frame is provided with a plurality of planes corresponding to the inner side surface of each permanent magnet in the permanent magnet group.

8. The contactless torque transmission device with overload protection according to claim 1, characterized in that: The transmission assembly includes a gear shaft connected to the inner rotor assembly and a flat key used to connect the inner rotor assembly and the gear shaft.

9. The contactless torque transmission device with overload protection according to claim 1, characterized in that: The support assembly includes a support member for mounting and fixing the transmission assembly, a bearing for mounting the transmission assembly on the support member, and a rotating support member for supporting and connecting the outer rotor assembly with the transmission assembly. The rotation support is used to constrain the axial position of the outer rotor assembly and ensure that the outer rotor assembly rotates coaxially relative to the transmission assembly.

10. The contactless torque transmission device with overload protection according to claim 1, characterized in that: The device further comprises a first spacer ring for spacing the inner rotor assembly and the outer rotor assembly and a second spacer ring for spacing the inner rotor assembly and the support assembly.

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