CN113685467B - Wheel hub, wheel hub subassembly, stopper and motor - Google Patents

Abstract

The invention provides a wheel hub, a wheel hub assembly, a brake and a motor. The wheel hub is suitable for the brake, and the wheel hub comprises: a first shaft segment for inserting and fitting with an inner hole of a friction plate of the brake; a second shaft segment, a second shaft The diameter of the section is larger than the diameter of the first shaft section; the shaft hole, the shaft hole penetrates the first shaft section and the second shaft section, so as to be sleeved on the rotating shaft; a plurality of buffer holes, the plurality of buffer holes are arranged at intervals in the second shaft section On the end face of the shaft segment, the center line of each buffer hole is parallel to the center line of the shaft hole. The wheel hub of the present invention solves the problem that when the brake in the prior art is powered off, a large impact force will be generated between the armature and the wheel hub assembly, resulting in the deformation of the parts.

Description

Wheel hubs, hub assemblies, brakes and motors

technical field

The present invention relates to the technical field of braking, and in particular, to a wheel hub, a wheel hub assembly, a brake and a motor.

Background technique

The brake is an indispensable part in the mechanical braking process of a rotating mechanism (such as a motor device, etc.). The brake is composed of an end cover, a brake iron core, a friction plate, a spring, a hub, an armature, a winding and a skeleton. The cover is formed into a fixed structure by screws or cold pressing or shrinking. The friction plate is consolidated with the hub to form a hub assembly. The skeleton and windings are embedded in the brake iron core. There is a gap between the iron core and the armature, which is the working stroke of the armature. , a plurality of springs are arranged between the brake iron core and the armature.

The wheel hub assembly is installed on the motor shaft, the end cover is installed on the motor casing, and the end cover is provided with a bearing position. When the brake is powered off, the elastic force of the spring presses the armature tightly against the hub assembly. At this time, the hub assembly is in a braking state because it cannot rotate circumferentially; when the brake is energized, the electromagnetic force formed by the brake iron core and the winding overcomes the elastic force of the spring. Pull the armature down, and the hub assembly can rotate freely to assume the brake release state.

However, when the brake in the prior art is de-energized, the spring force presses the armature toward the hub assembly, and the following problems occur:

(1) The armature and the hub assembly generate a large impact force due to the collision, resulting in large deformation of the parts, so that the gap between the iron core and the armature becomes larger, the working stroke increases, and finally the electromagnetic force is reduced enough to overcome the spring force. , causing the brake to fail;

(2) The collision between the armature and the hub assembly produces a large noise, which affects the user's experience.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a wheel hub, a wheel hub assembly, a brake and a motor, so as to solve the problem that when the brake in the prior art is powered off, a large impact force will be generated between the armature and the wheel hub assembly, resulting in the deformation of the parts. question.

In order to achieve the above object, according to an aspect of the present invention, a wheel hub is provided, which is suitable for a brake. The wheel hub includes: a first shaft segment for inserting and fitting with an inner hole of a friction plate of the brake; The diameter of the second shaft segment is larger than the diameter of the first shaft segment; the shaft hole, the shaft hole penetrates the first shaft segment and the second shaft segment, so as to be sleeved on the rotating shaft; a plurality of buffer holes, a plurality of buffer holes are arranged at intervals in On the end face of the second shaft segment, the centerline of each buffer hole is parallel to the centerline of the shaft hole.

Further, the diameter of the first shaft segment is D1, the diameter of the second shaft segment is D2, and the distance between the centerline of the buffer hole and the centerline of the shaft hole is R, wherein D1<2R<D2; and/or The buffer hole is a round hole, and the diameter of the buffer hole is d, among which,

Further, the plurality of buffer holes are evenly arranged at 360° around the center line of the shaft hole.

Further, the buffer holes are through holes or blind holes; and/or the number of buffer holes is nine; and/or the buffer holes are round holes, oval holes, or square holes.

Further, the ratio of the diameter of the first shaft segment to the diameter of the second shaft segment ranges from 0.2 to 0.8.

Further, the hub includes a third shaft section, the shaft hole penetrates the third shaft section, the third shaft section is located on the side of the second shaft section away from the first shaft section, and the diameter of the third shaft section is smaller than that of the first shaft section.

Further, the ratio of the diameter of the third shaft segment to the diameter of the second shaft segment ranges from 0.2 to 0.8.

Further, the third shaft segment is provided with a plurality of threaded holes for screwing with the plurality of fasteners in one-to-one correspondence, the plurality of threaded holes are arranged at intervals around the outer peripheral surface of the third shaft segment, and the centerline of each threaded hole is Vertical to the centerline of the shaft hole; one end of each threaded hole is located on the outer peripheral surface of the third shaft section, one end of each threaded hole is located on the hole wall surface of the shaft hole, and one end of each fastener passes through the corresponding threaded hole connected to the outer circumference of the shaft.

Further, the wheel hub includes a first keyway, the first keyway is arranged in the shaft hole, and the rotating shaft is provided with a second keyway corresponding to the first keyway to jointly enclose an installation space for installing the key.

According to a second aspect of the present invention, a wheel hub assembly is provided, comprising: the above-mentioned wheel hub; a friction plate; wherein the hub is fixedly connected to the friction plate, and the friction plate is located on the side of the second shaft segment close to the first shaft segment and covers the on the first shaft segment.

According to a third aspect of the present invention, there is provided a brake comprising a hub assembly and an at least partially movable armature assembly, the armature assembly including a braking state in contact with the hub assembly and a contact braking state separate from the hub assembly, The hub assembly is the aforementioned hub assembly.

According to a fourth aspect of the present invention, there is provided a motor including a rotating shaft and a brake mounted on the rotating shaft, and the brake is the above-mentioned brake.

Applying the technical solution of the present invention, the wheel hub of the present invention is suitable for a brake, and the wheel hub comprises: a first shaft segment for inserting and fitting with the inner hole of the friction plate of the brake; a second shaft segment, the diameter of the second shaft segment is larger than that of the The diameter of a shaft segment; the shaft hole, which penetrates the first shaft segment and the second shaft segment, so as to be sleeved on the rotating shaft; a plurality of buffer holes, which are arranged on the end face of the second shaft segment at intervals , The center line of each buffer hole is parallel to the center line of the shaft hole, so as to reduce the impact force generated by the collision between the armature and the hub when the brake is braking, reduce the deformation of the parts, ensure the reasonable working stroke of the brake, and reduce the braking time. The generated noise improves the user experience, and solves the problem that when the brake in the prior art is powered off, a large impact force is generated between the armature and the wheel hub assembly, resulting in deformation of the parts.

Description of drawings

The accompanying drawings forming a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

FIG. 1 shows a schematic structural diagram of an embodiment of a wheel hub according to the present invention;

Figure 2 shows a front view of the hub shown in Figure 1;

Figure 3 shows a half-section view of the hub shown in Figure 1;

FIG. 4 shows a schematic structural diagram in one direction of the embodiment of the wheel hub assembly with the wheel hub shown in FIG. 1 of the present invention;

FIG. 5 shows a schematic structural diagram of the embodiment of the wheel hub assembly with the wheel hub shown in FIG. 1 in another direction of the present invention;

FIG. 6 shows a cross-sectional view of the embodiment of the brake with the hub assembly shown in FIG. 4 installed on the motor of the present invention;

FIG. 7 shows a schematic diagram of the magnetic circuit of the embodiment of the brake with the hub assembly shown in FIG. 4 during operation;

FIG. 8 is a graph showing the impact force generated by the brake with the hub shown in FIG. 1 as a function of the diameter of the buffer hole when the power is turned off; and

FIG. 9 is a graph showing the change of the permanent deformation of the part generated by the second shaft section of the hub as a function of the diameter of the buffer hole when the brake with the hub shown in FIG. 1 is de-energized.

Wherein, the above-mentioned drawings include the following reference signs:

1. The first shaft segment; 2. The second shaft segment; 3. The third shaft segment; 4. The shaft hole; 5. The buffer hole; 6. The threaded hole; 7. The first keyway;

10, hub; 20, friction plate; 21, inner hole; 30, armature; 40, elastic part; 50, coil; 60, skeleton; 70, iron core; 71, inner air gap; 72, outer air gap; 80, End cover; 90, lead wire; 100, shaft; 110, casing.

Detailed ways

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in FIG. 1 to FIG. 7 , the present invention provides a wheel hub, which is suitable for a brake. The wheel hub includes: a first shaft segment 1 for inserting and fitting with an inner hole of a friction plate 20 of the brake; a second shaft segment 2 , the diameter of the second shaft segment 2 is larger than the diameter of the first shaft segment 1; the shaft hole 4, the shaft hole 4 penetrates the first shaft segment 1 and the second shaft segment 2, so as to be sleeved on the rotating shaft 100; a plurality of buffers Holes 5, a plurality of buffer holes 5 are arranged at intervals on the end surface of the second shaft segment 2, and the center line of each buffer hole 5 is parallel to the center line of the shaft hole 4.

The wheel hub of the present invention is suitable for a brake, and the wheel hub includes: a first shaft segment 1 for inserting and fitting with the inner hole of the friction plate 20 of the brake; a second shaft segment 2, the diameter of the second shaft segment 2 is larger than that of the first shaft segment The diameter of 1; the shaft hole 4, the shaft hole 4 penetrates the first shaft segment 1 and the second shaft segment 2, so as to be sleeved on the rotating shaft 100; a plurality of buffer holes 5, the plurality of buffer holes 5 are arranged at intervals in the second shaft On the end face of the shaft section 2, the center line of each buffer hole 5 is parallel to the center line of the shaft hole 4, so as to reduce the impact force generated by the collision between the armature and the hub when the brake is braking, reduce the deformation of the parts, and ensure the reasonableness of the brake. It reduces the noise generated during braking, improves the user experience, and solves the problem that when the brake in the prior art is powered off, a large impact force will be generated between the armature and the hub assembly, resulting in deformation of the parts. .

Specifically, when the hub is subjected to the impact force from the armature, the impact force and deformation of the second shaft segment 2 are related to the mechanical rigidity and flexibility of the material of the impact surface of the hub itself and the first shaft segment connected to the second shaft segment 2. 1 and the mechanical properties of the third shaft segment 3 are related. Designing buffer holes 5 in the second shaft section 2 can improve the flexibility of the second shaft section 2 while reducing its stiffness, and the improvement of flexibility can enhance the buffering capacity of the second shaft section 2 when it is impacted; The size of the section 1 and the third shaft section 3 ensures the rigidity of the connection between the second shaft section 2 and the first shaft section 1 and the third shaft section 3. The reasonable cooperation of the three shaft sections is combined with the second shaft section 2. The rational design of the buffer hole 5 finally achieves the purpose of improving the flexibility of the second shaft segment 2 while ensuring the rigidity of the connection between it and the first shaft segment 1 and the third shaft segment 3, thereby reducing the size of the second shaft segment. Deformation and noise after segment 2 is impacted.

Preferably, the diameter of the first shaft segment 1 is D1, the diameter of the second shaft segment 2 is D2, and the distance between the centerline of the buffer hole 5 and the centerline of the shaft hole 4 is R, where D1<2R<D2 ; and/or the buffer hole 5 is a circular hole, the diameter of the buffer hole 5 is d, wherein,

It can be seen from the graph that the impact force generated by the brake with the hub of the present invention changes with the change of the diameter of the buffer hole 5 when the power is turned off, as shown in FIG. And with the increase of d×D1/D2, the impact force first decreases and then increases.

It can be seen from the graph in Fig. 9 that the permanent deformation of the part generated by the second shaft segment 2 of the hub changes with the change of the diameter of the buffer hole 5 when the brake with the hub shown in Fig. 1 is powered off. With the increase of ×D1/D2, the permanent deformation of the parts after the impact force on the second shaft segment 2 first decreases and then increases.

Specifically, the position where the part is permanently deformed is the end face of the second shaft segment 2 of the hub. If the permanent deformation is caused by the impact force, the air gap of the working stroke between the armature 30 and the iron core 70 will increase. When the brake is energized under the condition of constant voltage and voltage, the electromagnetic attractive force generated by the coil 50 is greatly reduced due to the increase of the air gap of the working stroke, so that the electromagnetic attractive force cannot overcome the elastic force of the spring, and finally the armature 30 of the brake is caused. The brake cannot be applied.

时，可有效地削弱制动器在制动时衔铁30与轮毂组件碰撞产生的冲击力，不仅能够降低轮毂的零件永久变形量，保证制动器的合理的工作行程，而且能够降低制动时产生的噪音，提升用户的使用体验。To sum up, using the brake with the hub of the present invention, when the diameter d of the buffer hole 5 satisfies d3<d1<d and

It can effectively weaken the impact force generated by the collision between the armature 30 and the hub assembly when the brake is braking, which can not only reduce the permanent deformation of the parts of the hub, ensure a reasonable working stroke of the brake, but also reduce the noise generated during braking. Improve user experience.

Further preferably, the plurality of buffer holes 5 are evenly arranged around the center line of the shaft hole 4 at 360°, that is, the included angle of the connecting line between the center line of any two adjacent buffer holes 5 and the center line of the shaft hole 4 is equal. .

In addition, the plurality of buffer holes 5 can also be arranged unevenly at 360° around the center line of the shaft hole 4 , that is, the center lines of any two adjacent buffer holes 5 are parallel to the connecting line between the center lines of the shaft holes 4 . The angles may or may not be equal.

The buffer holes 5 are through holes or blind holes; and/or the number of buffer holes 5 is nine; and/or the buffer holes 5 are round holes, oval holes, square holes or other irregular shaped holes.

The ratio of the diameter of the first shaft section 1 to the diameter of the second shaft section 2 ranges from 0.2 to 0.8. In this way, the reliable connection between the wheel hub 10 and the friction plate 20 can be ensured, and the impact force and the permanent deformation of the parts caused by the collision between the armature 30 and the wheel hub can be reduced when the brake is applied.

As shown in FIG. 1 to FIG. 3 , the hub includes a third shaft segment 3, the shaft hole 4 passes through the third shaft segment 3, the third shaft segment 3 is located on the side of the second shaft segment 2 away from the first shaft segment 1, and the third The diameter of the shaft section 3 is smaller than the diameter of the first shaft section 1 .

Specifically, the third shaft segment 3 is provided with a plurality of threaded holes 6 for screwing with a plurality of fasteners in a one-to-one correspondence, and the plurality of threaded holes 6 are arranged at intervals around the outer peripheral surface of the third shaft segment 3, The center line of the hole 6 is perpendicular to the center line of the shaft hole 4; one end of each threaded hole 6 is located on the outer peripheral surface of the third shaft section 3, one end of each threaded hole 6 is located on the hole wall surface of the shaft hole 4, and each fastener One end of the wheel passes through the corresponding threaded hole 6 and then abuts on the outer peripheral surface of the rotating shaft 100 , so as to realize the axial limit of the hub on the rotating shaft 100 through the threaded hole 6 .

Wherein, the ratio of the diameter of the third shaft segment 3 to the diameter of the second shaft segment 2 ranges from 0.2 to 0.8 to ensure that the threaded hole 6 has a sufficient length to facilitate the installation and fixation of the fastener; and/or The difference between the length of the third shaft segment 3 and the major diameter of the threaded hole 6 is greater than or equal to 4 mm, so as to ensure that the threaded hole 6 with a large diameter of sufficient size can be processed to facilitate the installation and fixation of fasteners of the corresponding size. .

The hub includes a first keyway 7, the first keyway 7 is arranged in the shaft hole 4, and the rotating shaft 100 is provided with a second keyway corresponding to the first keyway 7, so as to jointly enclose an installation space for installing keys to pass the first keyway. A keyway 7 and a second keyway realize the circumferential limit of the hub on the rotating shaft 100 .

As shown in Figures 4 and 5, the present invention provides a wheel hub assembly, comprising: the above-mentioned wheel hub 10; a friction plate 20; wherein, the hub is fixedly connected with the friction plate 20, and the friction plate 20 is located in the second shaft section 2 close to the first One side of a shaft section 1 is sleeved on the first shaft section 1 for contacting with the movable armature to generate frictional force.

Wherein, the friction plate 20 is provided with an inner hole 21 for matching with the first shaft segment 1 and sleeved on the first shaft segment 1, and the inner hole 21 and the first shaft segment 1 are connected by interference, so that the hub 10 It is fixedly connected with the friction plate 20.

As shown in FIG. 6, the present invention provides a brake including a hub assembly and an at least partially movable armature assembly, the armature assembly includes a braking state in contact with the hub assembly and a contact braking state separated from the hub assembly, The hub assembly is the aforementioned hub assembly.

As shown in FIG. 6 , the present invention provides a motor including a rotating shaft 100 and a brake mounted on the rotating shaft 100 , and the brake is the above-mentioned brake.

Specifically, the brake of the present invention is a split type brake, including a hub assembly and an armature assembly, the hub assembly includes a fixedly connected hub 10 and a friction plate 20, and the armature assembly includes an armature 30, an elastic member 40, a coil 50, a skeleton 60, an iron core 70. The end cover 80 and the lead wire 90, etc., the whole brake is installed on the rotating shaft 100 of the motor and is located in the casing 110, the armature 30 is movably arranged along the rotating shaft 100, the end cover 80 is provided with a bearing position, the iron core 70 and the The end cover 80 is connected by fasteners, or cold pressing, or shrinking to form a fixed structure. The coil 50 is wound on the frame 60 and embedded in the iron core 70. There is a gap between the iron core 70 and the armature 30. A plurality of elastic members 40 are arranged.

As shown in Figure 7, it can be seen from theoretical analysis that when the brake is energized, the magnetic field will form a cyclic main magnetic circuit as indicated by the arrow along the armature 30→outer air gap 72→iron core 70→inner air gap 71→armature 30, The electromagnetic force generated by the circuit is denoted as F1, and the elastic force of the elastic member 40 is denoted as F2, where F1<2F2.

When the brake is energized, the electromagnetic force F1>elastic force F2, the armature moves close to the iron core 70 under the action of the combined force of the electromagnetic force F1 and the elastic force F and collides with the iron core 70 to generate the first impact force F3; when the brake is de-energized When the electromagnetic force F1=0, the armature moves in the direction close to the hub assembly under the action of the spring force F2 and collides with the friction plate 20 to generate the second impact force F4. The movement stroke is S.

When the brake is energized, it should meet:

F1-F2=ma ₁

When the brake is de-energized, it should meet:

F2=ma ₂

Obviously, a ₁ <a ₂ , therefore, under the condition that the movement stroke S of the armature 30 is the same when the brake is energized and de-energized, F3 < F4, that is, compared with when the brake is energized, the armature 30 collides with the hub 10 when the brake is de-energized Greater impact force will be generated, resulting in greater part deformation and noise. Therefore, the wheel hub 10 of the present invention needs to be provided to reduce the impact force, part deformation and noise caused by the collision between the armature 30 and the wheel hub 10 when the brake is powered off.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

The wheel hub of the present invention is suitable for a brake, and the wheel hub includes: a first shaft segment 1 for inserting and fitting with the inner hole of the friction plate 20 of the brake; a second shaft segment 2, the diameter of the second shaft segment 2 is larger than that of the first shaft segment The diameter of 1; the shaft hole 4, the shaft hole 4 penetrates the first shaft segment 1 and the second shaft segment 2, so as to be sleeved on the rotating shaft 100; a plurality of buffer holes 5, the plurality of buffer holes 5 are arranged at intervals in the second shaft On the end face of the shaft section 2, the center line of each buffer hole 5 is parallel to the center line of the shaft hole 4, so as to reduce the impact force generated by the collision between the armature and the hub when the brake is braking, reduce the deformation of the parts, and ensure the reasonableness of the brake. It reduces the noise generated during braking, improves the user experience, and solves the problem that when the brake in the prior art is powered off, a large impact force will be generated between the armature and the hub assembly, resulting in deformation of the parts. .

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that, for the convenience of description, the dimensions of various parts shown in the accompanying drawings are not drawn in an actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized description. In all examples shown and discussed herein, any specific value should be construed as illustrative only and not as limiting. Accordingly, other examples of exemplary embodiments may have different values. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of this application, it should be understood that the orientations indicated by the orientation words such as "front, rear, top, bottom, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. Or the positional relationship is usually based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and these orientations do not indicate or imply the indicated device or element unless otherwise stated. It must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be construed as a limitation on the protection scope of the application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

For ease of description, spatially relative terms, such as "on", "over", "on the surface", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one device or feature shown to other devices or features. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or features would then be oriented "below" or "over" the other devices or features under other devices or constructions". Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood to limit the scope of protection of this application.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (12)

1. A wheel hub, suitable for a brake, is characterized in that, the wheel hub comprises: The first shaft segment (1) is used for inserting and fitting with the inner hole of the friction plate (20) of the brake; a second shaft segment (2), the diameter of the second shaft segment (2) is larger than the diameter of the first shaft segment (1); a shaft hole (4), the shaft hole (4) passing through the first shaft segment (1) and the second shaft segment (2), so as to be sleeved on the rotating shaft (100); a plurality of buffer holes (5), the plurality of buffer holes (5) are arranged at intervals on the end face of the second shaft segment (2), and the centerline of each buffer hole (5) is parallel to the shaft hole (4) ) centerline; The diameter of the first shaft segment (1) is D1, the diameter of the second shaft segment (2) is D2, the buffer hole (5) is a circular hole, and the diameter of the buffer hole (5) is d, in,

2. The hub according to claim 1, characterized in that, The distance between the center line of the buffer hole (5) and the center line of the shaft hole (4) is R, wherein D1<2R<D2. 3. The wheel hub according to claim 1 or 2, characterized in that, a plurality of the buffer holes (5) are evenly arranged at 360° around the center line of the shaft hole (4). 4. The hub according to claim 1 or 2, characterized in that, The buffer hole (5) is a through hole or a blind hole; and/or The number of the buffer holes (5) is nine; and/or The buffer hole (5) is a round hole, an oval hole, or a square hole. 5. The hub according to claim 1 or 2, characterized in that, The ratio of the diameter of the first shaft segment (1) to the diameter of the second shaft segment (2) ranges from 0.2 to 0.8. 6. The hub according to claim 1 or 2, characterized in that, The hub comprises a third shaft segment (3), the shaft hole (4) penetrates the third shaft segment (3), and the third shaft segment (3) is located at the second shaft segment (2) away from the On one side of the first shaft segment (1), the diameter of the third shaft segment (3) is smaller than the diameter of the first shaft segment (1). 7. The hub of claim 6, wherein The ratio of the diameter of the third shaft segment (3) to the diameter of the second shaft segment (2) ranges from 0.2 to 0.8. 8. The hub of claim 6, wherein The third shaft segment (3) is provided with a plurality of threaded holes (6) for screwing with a plurality of fasteners in a one-to-one correspondence, and the plurality of threaded holes (6) surround the third shaft segment The outer peripheral surfaces of (3) are arranged at intervals, and the centerline of each threaded hole (6) is perpendicular to the centerline of the shaft hole (4); One end of each threaded hole (6) is located on the outer peripheral surface of the third shaft segment (3), one end of each threaded hole (6) is located on the hole wall surface of the shaft hole (4), and one end of each fastener After passing through the corresponding threaded hole (6), it abuts on the outer peripheral surface of the rotating shaft (100). 9. The wheel hub according to claim 1 or 2, characterized in that, the wheel hub comprises a first keyway (7), the first keyway (7) is arranged in the shaft hole (4), and the rotating shaft (100) is provided with a second keyway corresponding to the first keyway (7), so as to jointly enclose an installation space for installing keys. 10. A wheel hub assembly, characterized in that, comprising: The hub of any one of claims 1 to 9; friction plate (20); Wherein, the hub is fixedly connected with the friction plate (20), the friction plate (20) is located on the side of the second shaft segment (2) close to the first shaft segment (1) and is sleeved on the first shaft segment (1). on the shaft segment (1). 11. A brake comprising a hub assembly and an at least partially movable armature assembly, the armature assembly including a braking state in contact with the hub assembly and a contact braking state separate from the hub assembly, wherein In that, the hub assembly is the hub assembly of claim 10 . 12. A motor, comprising a rotating shaft (100) and a brake mounted on the rotating shaft (100), characterized in that the brake is the brake according to claim 11.

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