Locking shaft sleeve of magnetic suspension bearing thrust disc

Abstract

The utility model discloses a locking shaft sleeve of magnetic suspension bearing thrust disc, it includes shaft sleeve body, oblique locking piece and buffer piece, the middle part of shaft sleeve body is equipped with internal thread hole, and the outer edge of shaft sleeve body is equipped with the oblique thread hole of inclined arrangement along the circumference, and the bottom between oblique thread hole and internal thread hole is equipped with buffer groove, and the rotation of oblique thread hole is contrary with the rotation of internal thread hole, and buffer piece sets up in buffer groove and the surface of buffer piece is flush with the crest of internal thread hole, and each oblique locking piece locks in corresponding oblique thread hole, to make the bottom of oblique locking piece lean on buffer piece, and the shaft sleeve body is sleeved on the pivot, and is implemented tapping to buffer piece through external thread section. The locking shaft sleeve of magnetic suspension bearing thrust disc is equipped with the oblique thread hole of inclined arrangement, and the locking force distribution is more uniform, and the rotation of oblique thread hole is contrary with the rotation of internal thread hole, and constitutes the self -locking structure of thread pair, greatly improves the pre -tightening force, and the installation stability is good.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic levitation technology, and in particular relates to a locking bushing for a magnetic levitation bearing thrust disc. Background Technology

[0002] With the development of magnetic levitation technology, high-speed magnetic levitation motors are increasingly being used in various industries. Traditional motors use mechanical bearings to support the shaft, resulting in relatively low speeds. Gear mechanisms are typically used to increase the speed, leading to transmission and mechanical friction losses. Magnetic levitation motors, on the other hand, use magnetic bearings to levitate the shaft in space using electromagnetic force, enabling high-speed operation. They offer advantages such as zero mechanical friction, long lifespan, and low noise. In high-speed magnetic levitation motors, the thrust plate transmits the axial load generated by the magnetic bearings, while the locking bushing rigidly restricts the axial displacement of the thrust plate. These three components work together to form a rotor support system, creating a closed-loop "levitation-load-locking" function. This provides core support for the motor to achieve high reliability and long lifespan operation under high-speed conditions.

[0003] Currently, locking bushings are typically fitted onto the outer end of a rotating shaft to lock the thrust disc. To improve locking force and ease of operation, existing locking bushings usually have an internal thread on the inner wall of the bushing body that matches the external thread on the rotating shaft. An insert is embedded in a groove on the bushing body. During screwing, the surface of the insert that contacts the external thread of the rotating shaft is tapped by the external thread to create threads that match it. After tightening, a flat-head bolt is inserted into the threaded holes arranged 180° opposite to each other for threaded connection. The flat-head bolt applies additional clamping force to the insert, making the insert fit even more tightly against the surface of the rotating shaft, achieving high locking force. However, since the flat-head bolt can only provide unidirectional locking force in the radial direction, it is prone to vibration and preload reduction under long-term high-speed operation, causing bolt loosening and resulting in poor installation stability, which urgently needs to be addressed. Utility Model Content

[0004] The purpose of this invention is to provide a locking bushing for a magnetic levitation bearing thrust disc, so as to solve the problem of poor installation stability of conventional locking bushings in the prior art.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A locking bushing for a magnetic levitation bearing thrust disc, the locking bushing being sleeved on the outer end face of a rotating shaft, the locking bushing comprising a bushing body and at least one set of locking components, wherein:

[0007] The bushing body has an internal threaded hole in the middle, and the outer end face of the rotating shaft has an external threaded section. The internal threaded hole and the external threaded section are adapted to each other. The bushing body is detachably installed on the rotating shaft through the cooperation of the internal threaded hole and the external threaded section.

[0008] At least one inclined threaded hole is formed circumferentially along the outer edge of the bushing body. A buffer groove is formed between the bottom of the inclined threaded hole and the internal threaded hole. Each inclined threaded hole corresponds to a set of locking components. Each set of locking components includes an inclined locking member and a buffer member. The inclined locking member is adapted to the inclined threaded hole. The rotation direction of the inclined threaded hole is opposite to that of the internal threaded hole. The buffer member is disposed in the buffer groove and the surface of the buffer member is flush with the tooth crest of the internal threaded hole. Each inclined locking member is locked in the corresponding inclined threaded hole so that the bottom of the inclined locking member abuts against the buffer member. The bushing body is sleeved on the rotating shaft so that the buffer member extending to the tooth crest of the internal threaded hole is tapped through the external thread section.

[0009] Furthermore, three oblique threaded holes are provided, which are circumferentially opened on the outer edge of the bushing body. The oblique threaded holes are distributed at 120° intervals between adjacent two oblique threaded holes. Three sets of locking components are provided, and the three sets of locking components are arranged one-to-one with the three oblique threaded holes.

[0010] Furthermore, at least one locking groove is provided on the outer edge surface of the bushing body. Each locking groove extends along the axial direction of the bushing body and is located between two adjacent oblique threaded holes. An external locking fixture is embedded in the locking groove and rotates to tighten the bushing body onto the rotating shaft.

[0011] Furthermore, three locking grooves are evenly distributed on the outer edge surface of the bushing body, and each locking groove is spaced 60° apart from the two adjacent oblique threaded holes.

[0012] Furthermore, the oblique locking component is an oblique bolt, the shank of the oblique bolt has a threaded section adapted to the oblique threaded hole, the bushing body has a countersunk groove at the top of the oblique threaded hole, and the head of the oblique bolt abuts in the countersunk groove.

[0013] Furthermore, the buffer is a soft metal insert.

[0014] Furthermore, the angle between the axis of the oblique threaded hole and the axis of the bushing body is an acute angle.

[0015] Compared with the prior art, the beneficial effects of the locking bushing of the magnetic levitation bearing thrust disc are as follows:

[0016] 1) By opening inclined threaded holes on the outer circumference of the bushing body, the direction of rotation of the inclined threaded holes is opposite to that of the internal threaded holes. Each inclined locking element is locked in the corresponding inclined threaded hole, so that the bottom of the inclined locking element abuts against the buffer. The inclined threaded holes not only decompose the locking force into axial and radial components, making the locking force distribution more uniform, but also increase the length of the inclined locking element in the same assembly space, thus enhancing the tensile strength. The direction of rotation of the inclined threaded holes is opposite to that of the internal threaded holes, forming a self-locking structure of the threaded pair, which greatly improves the preload and has good installation stability.

[0017] 2) By providing a buffer groove between the bottom of the oblique threaded hole and the internal threaded hole, the soft metal insert is set in the buffer groove, the bushing body is sleeved on the rotating shaft, and the soft metal insert extending to the tooth crest of the internal threaded hole is tapped by the external thread section. This not only buffers the stress between the locking bushing and the rotating shaft during operation, but also significantly improves the wear resistance of the inner surface of the locking bushing.

[0018] 3) By providing a locking groove on the outer edge of the bushing body, and by engaging an external locking fixture which is then inserted into and rotated, the bushing body is tightened onto the rotating shaft, thus providing a bushing body that is easy to disassemble and reassemble and can be locked a second time. Attached Figure Description

[0019] To more clearly illustrate and understand the technical solutions in the embodiments of this utility model, the accompanying drawings used in the background technology and embodiment description of this utility model will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional view of the locking bushing of the magnetic levitation bearing thrust disk provided in this embodiment of the utility model.

[0021] Figure 2 This is a three-dimensional structural schematic diagram of the locking bushing of the magnetic levitation bearing thrust disc provided in this embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the installation structure of the locking bushing of the magnetic levitation bearing thrust disc provided in this embodiment of the utility model;

[0023] Figure 4 yes Figure 3 Schematic diagram of cross-section at point AA. Detailed Implementation

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] To facilitate understanding of this utility model, a more complete description of it will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model. It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there may be an intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations. 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 utility model belongs. The terminology used herein in the description of this utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Please see Figures 1 to 4 As shown, in this embodiment, a locking bushing for a magnetic levitation bearing thrust plate is sleeved on the outer end face of a rotating shaft 10. The locking bushing for the magnetic levitation bearing thrust plate includes a bushing body 20 and at least one set of locking components 30. The bushing body 20 has an internal threaded hole 21 in its middle portion, and the outer end face of the rotating shaft 10 has an external threaded section 11. The internal threaded hole 21 and the external threaded section 11 are adapted to each other. The bushing body 20 is detachably mounted on the rotating shaft 10 through the cooperation of the internal threaded hole 21 and the external threaded section 11. At least one inclined oblique threaded hole 22 is opened circumferentially along the outer edge of the bushing body 20. A buffer is provided between the bottom of the oblique threaded hole 22 and the internal threaded hole 21. The groove 23 has a set of locking components 30 for each oblique threaded hole 22. Each set of locking components 30 includes an oblique locking member 31 and a buffer member 32. The oblique locking member 31 is adapted to the oblique threaded hole 22. The rotation direction of the oblique threaded hole 22 is opposite to that of the internal threaded hole 21. The buffer member 32 is set in the buffer groove 23 and the surface of the buffer member 32 is flush with the tooth crest of the internal threaded hole 21. Each oblique locking member 31 is locked in the corresponding oblique threaded hole 22 so that the bottom of the oblique locking member 31 abuts against the buffer member 32. The bushing body 20 is sleeved on the rotating shaft 10 so as to tap the buffer member 32 extending to the tooth crest of the internal threaded hole 21 through the external thread section 11.

[0027] As can be seen, by opening inclined threaded holes 22 on the outer circumference of the bushing body 20, the direction of rotation of the inclined threaded holes 22 is opposite to that of the internal threaded holes 21. Each inclined locking member 31 is locked in the corresponding inclined threaded hole 22, so that the bottom of the inclined locking member 31 abuts against the buffer member 32. The inclined threaded holes 22 not only decompose the locking force into axial and radial components, making the locking force distribution more uniform, but also increase the length of the inclined locking member 31 in the same assembly space, thereby enhancing the tensile strength. The direction of rotation of the inclined threaded holes 22 is opposite to that of the internal threaded holes 21, forming a self-locking structure of the threaded pair, which greatly improves the preload and provides good installation stability.

[0028] In one embodiment, three oblique threaded holes 22 are provided, and the three oblique threaded holes 22 are provided circumferentially on the outer edge of the bushing body 20. The two adjacent oblique threaded holes 22 are distributed at a interval of 120°. Three sets of locking components 30 are provided, and the three sets of locking components 30 are provided in a one-to-one correspondence with the three oblique threaded holes 22.

[0029] Of course, four oblique threaded holes 22 may also be provided, with adjacent oblique threaded holes 22 spaced 90° apart. The number of oblique threaded holes 22 will not be elaborated here, and can be flexibly set according to different functions and requirements.

[0030] As can be seen, by setting three oblique threaded holes 22, with an interval of 120° between adjacent oblique threaded holes 22, the traditional bushing threaded holes and matching bolts are orthogonally arranged, and the direction of rotation of the threaded holes is the same as the direction of rotation of the bushing internal thread. The stress is concentrated at the root, which is prone to fretting wear and fatigue cracks under high frequency vibration conditions. Therefore, compared with the traditional threaded holes arranged at 180° opposite, the locking bushing of this application adopts an oblique threaded hole structure with an axial tilt angle. The preload of the oblique locking element 31 is more than 20% higher than the preload of the vertically arranged bolts, the locking force distribution is more uniform, and the stability is better.

[0031] In one embodiment, at least one locking groove 40 is provided on the outer edge surface of the bushing body 20. Each locking groove 40 extends along the axial direction of the bushing body 20 and is located between two adjacent oblique threaded holes 22. An external locking fixture is embedded in the locking groove 40 and rotates to tighten the bushing body 20 onto the rotating shaft 10.

[0032] Specifically, the external locking fixture is a wrench with a 40-size locking groove.

[0033] As can be seen, by providing a locking groove 40 on the outer edge surface of the bushing body 20, and cooperating with the external locking fixture to be embedded in the locking groove 40 and rotated, the bushing body 20 is tightened onto the rotating shaft 10, providing a bushing body 20 that is easy to disassemble and reassemble and can achieve secondary locking.

[0034] In one embodiment, three locking grooves 40 are evenly distributed on the outer edge surface of the bushing body 20, and each locking groove 40 is spaced 60° apart from two adjacent oblique threaded holes 22.

[0035] Specifically, the locking groove 40 is a through rectangular groove. Regarding the specific dimensions such as the width, length and depth of the rectangular groove opened in the circumferential direction of the outer circular wall of the bushing body 20, this application does not make specific limitations, and can be flexibly set according to the size of the bushing body 20 and the locking force requirements.

[0036] As can be seen, the symmetrical layout of the evenly distributed locking grooves 40 and the oblique threaded holes 22 at 60° intervals, with the locking grooves 40 and threaded holes staggered, avoids assembly conflicts with the oblique locking parts 31 and enhances the overall structural stability. At the same time, the locking structure with even distribution in multiple directions can limit and fix or unlock the bushing body 20 from different angles, significantly improving the efficiency of disassembly and assembly.

[0037] In one embodiment, the oblique locking member 31 is an oblique bolt. The shank of the oblique bolt has a threaded section that is adapted to the oblique threaded hole 22. The bushing body 20 has a countersunk groove 24 at the top of the oblique threaded hole 22, and the head of the oblique bolt abuts in the countersunk groove 24.

[0038] As can be seen, the threaded engagement achieves a stable locking, ensuring the reliability of the connection between the oblique bolt and the bushing body 20. The countersunk groove 24 allows the bolt head to be fully embedded in the bushing body 20, preventing the head from protruding outward and interfering with the operation of other components, and ensuring the flatness of the outer edge surface of the bushing.

[0039] In one implementation, the buffer 32 is a soft metal insert.

[0040] Specifically, the soft metal insert is made of copper, aluminum-lead alloy, or tin-lead alloy, etc. This application does not make specific restrictions on the material of the soft metal insert, and it can be flexibly set according to requirements.

[0041] As can be seen, by providing a buffer groove 23 between the bottom of the oblique threaded hole 22 and the internal threaded hole 21, and setting the soft metal insert in the buffer groove 23, the bushing body 20 is sleeved on the rotating shaft 10. By tapping the soft metal insert extending to the tooth crest of the internal threaded hole 21 through the external thread section 11, it is possible not only to buffer the stress between the locking bushing and the rotating shaft 10 during operation, but also to significantly improve the wear resistance of the inner surface of the locking bushing.

[0042] In one embodiment, the angle between the axis of the oblique threaded hole 22 and the axis of the bushing body 20 is an acute angle.

[0043] Specifically, the angle between the axis of the oblique threaded hole 22 and the axis of the bushing body 20 is 60° or 75°. The angle will not be elaborated here, but can be flexibly set according to different functions and requirements.

[0044] It should be noted that: the locking bushing of this application is fitted onto the outer end face of the rotating shaft 10 to lock the thrust plate 100. The bushing body 20 has a buffer groove 23 at the root of the internal thread hole 21 and a high-performance soft metal insert is embedded therein. The thickness of the soft metal insert is about 3 to 4 mm as a strain buffer layer. The elastic deformation of the soft metal insert can effectively reduce the stress amplitude, improve thermal stress, and extend the bolt life. The outer edge of the bushing body 20 is provided with a slanted thread hole 22. After the slanted bolt is inserted into the thread hole, the slanted bolt is tightened with a wrench. After the slanted bolt is screwed in and installed, the soft metal insert is embedded into the buffer groove 23 using a melting infiltration inlay process to ensure that the height of the soft metal insert is flush with the tooth height of the internal thread hole 21 of the bushing body 20. Thus, the bushing body 20 can be installed on the rotating shaft 10 by rotating and screwing it in.

[0045] When the locking bushing of the aforementioned magnetic levitation bearing thrust disc is locked, the bushing body 20 is screwed onto the rotating shaft 10. The external thread of the rotating shaft 10 will be tapped with matching threads on the outer surface of the soft metal insert. The threads tapped on the soft metal insert and the external thread of the rotating shaft 10 form a tight fit. That is, the frictional resistance is generated by the elastic deformation of the soft metal material to achieve anti-loosening. In addition, an external locking fixture can be used to be embedded in the locking groove 40 and rotated to achieve secondary locking of the bushing body 20 and enhance the locking effect.

[0046] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above examples. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A locking bushing for a magnetic levitation bearing thrust disc, the locking bushing being sleeved on the outer end face of a rotating shaft, characterized in that, The locking bushing of the magnetic levitation bearing thrust disk includes a bushing body and at least one set of locking components, wherein: The bushing body has an internal threaded hole in the middle, and the outer end face of the rotating shaft has an external threaded section. The internal threaded hole and the external threaded section are adapted to each other. The bushing body is detachably installed on the rotating shaft through the cooperation of the internal threaded hole and the external threaded section. At least one inclined threaded hole is formed circumferentially along the outer edge of the bushing body. A buffer groove is formed between the bottom of the inclined threaded hole and the internal threaded hole. Each inclined threaded hole corresponds to a set of locking components. Each set of locking components includes an inclined locking member and a buffer member. The inclined locking member is adapted to the inclined threaded hole. The rotation direction of the inclined threaded hole is opposite to that of the internal threaded hole. The buffer member is disposed in the buffer groove and the surface of the buffer member is flush with the tooth crest of the internal threaded hole. Each inclined locking member is locked in the corresponding inclined threaded hole so that the bottom of the inclined locking member abuts against the buffer member. The bushing body is sleeved on the rotating shaft so that the buffer member extending to the tooth crest of the internal threaded hole is tapped through the external thread section.

2. The locking bushing of the magnetic levitation bearing thrust disc according to claim 1, characterized in that, The bushing body has three oblique threaded holes, which are circumferentially opened on the outer edge of the bushing body. The oblique threaded holes are distributed at 120° intervals between adjacent two oblique threaded holes. There are three sets of locking components, and the three sets of locking components are arranged one-to-one with the three oblique threaded holes.

3. The locking bushing of the magnetic levitation bearing thrust disc according to claim 2, characterized in that, At least one locking groove is provided on the outer edge surface of the bushing body. Each locking groove extends along the axial direction of the bushing body and is located between two adjacent oblique threaded holes. An external locking fixture is embedded in the locking groove and rotates to tighten the bushing body onto the rotating shaft.

4. The locking bushing of the magnetic levitation bearing thrust disc according to claim 3, characterized in that, The outer edge of the bushing body is provided with three locking grooves, and each locking groove is spaced 60° apart from the two adjacent oblique threaded holes.

5. The locking bushing of the magnetic levitation bearing thrust disc according to claim 1, characterized in that, The oblique locking component is an oblique bolt. The shank of the oblique bolt has a threaded section that is adapted to the oblique threaded hole. The bushing body has a countersunk groove at the top of the oblique threaded hole, and the head of the oblique bolt abuts in the countersunk groove.

6. The locking bushing of the magnetic levitation bearing thrust disc according to claim 1, characterized in that, The buffer is a soft metal insert.

7. The locking bushing of the magnetic levitation bearing thrust disc according to claim 1, characterized in that, The angle between the axis of the oblique threaded hole and the axis of the bushing body is an acute angle.

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