Split brake and electric machine comprising same

Abstract

The application provides a split brake and a motor comprising the same, relates to the technical field of brakes, and solves the technical problem of small braking torque of the split brake. The split electromagnetic brake mainly comprises an armature, a main friction plate, a secondary friction plate and a rear end cover, etc. The main friction plate is located on one side of the armature. The secondary friction plate is installed on the side of the rear end cover facing the main friction plate. When the brake is not working, the main friction plate and the secondary friction plate are in a separated state. When the brake is working, the armature can push the main friction plate to contact and rub with the secondary friction plate to be in a braking state. The application further comprises a rubber ring arranged on the outer side of the main friction plate. The application glues the secondary friction plate to the rear end cover, uses the elastic deformation of the secondary friction plate to compensate for the deviation of the perpendicularity of the rear end cover and the main friction plate, prevents the damage of the large deviation of the perpendicularity to the main friction plate, increases the friction coefficient of the main and secondary friction plates, reduces the armature pressure, and reduces the spring rigidity and the winding power.

Description

Technical Field

[0001] The present invention relates to the technical field of brakes, and in particular to a split-type brake without axial force and a motor comprising the same. Background Art

[0002] The electromagnetic brake is an important basic component that switches between the holding and opening states between power on and power off. It is mainly used for safe braking of rotating mechanisms (such as motor devices, etc.). Currently, servo motor brakes are mainly divided into split and integral types. The traditional integral brake is double-sided friction, has more parts and is larger in size. Figure 1 As shown, the traditional split brake is a single-sided friction with a small braking torque, and the wheel hub 3 is fixedly connected to the rotating shaft 4, while the friction plate 9 is installed on the wheel hub 3 with no movable gap, resulting in the force on the friction plate being transmitted to the rotating shaft 4 during braking, resulting in a large axial force on the rotating shaft during braking. Summary of the Invention

[0003] The object of the present invention is to provide a split brake without axial force and a motor comprising the same, so as to solve the technical problem of low braking torque of the split brake in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] The present invention provides a split brake, comprising an armature, a primary friction plate, an auxiliary friction plate and a rear end cover; wherein:

[0006] The main friction plate is located on one side of the armature;

[0007] The auxiliary friction plate is mounted on a side of the rear end cover facing the main friction plate;

[0008] When the brake is not working, the primary friction plate and the secondary friction plate are in a separated state; when the brake is working, the armature can push the primary friction plate and the secondary friction plate to contact and rub to form a braking state.

[0009] The split brake provided by the present invention has a secondary friction plate glued to the rear end cover, realizing bilateral friction, which not only reduces the loss of the friction plate caused by the verticality deviation of the rear end cover, but also increases the friction torque, resulting in a large braking torque, thereby solving the problems of reduced braking torque, friction plate loss and small unilateral friction braking torque caused by the verticality deviation between the friction plate and the rear end cover.

[0010] As a further improvement of the present invention, a receiving groove is provided on the rear end cover, and the auxiliary friction plate is placed in the receiving groove.

[0011] As a further improvement of the present invention, the thickness of the secondary friction plate in the axial direction is greater than the depth of the accommodating groove.

[0012] As a further improvement of the present invention, the diameter of the primary friction plate is greater than the diameter of the secondary friction plate.

[0013] As a further improvement of the present invention, it also includes a wear-resistant part arranged on the outer circumference of the main friction plate.

[0014] As a further improvement of the present invention, the wear-resistant part is a full-circle rubber ring or a plurality of rubber blocks arranged at intervals.

[0015] As a further improvement of the present invention, the thickness of the wear-resistant part in the axial direction is greater than the thickness of the main friction plate.

[0016] The present invention glues a rubber ring or rubber block to the outer circumference of the main friction plate. The thickness of the rubber ring or rubber block is slightly larger than that of the main friction plate, which supports the main friction plate. When the brake is energized, there is a certain gap between the main friction plate and the armature and the rear end cover, thereby reducing the friction loss caused by the synchronous rotation of the main friction plate. By arranging the rubber ring or rubber block to support the main friction plate, it is also possible to prevent vibration caused by eccentricity or installation problems of the main friction plate, as well as abnormal noise caused by collision with the armature or the rear end cover due to vibration.

[0017] As a further improvement of the present invention, it further comprises a rotating shaft and a hub, wherein:

[0018] The rotating shaft passes through the rear end cover and the armature in sequence;

[0019] The wheel hub is sleeved on the rotating shaft and is located between the rear end cover and the armature;

[0020] The main friction plate is formed and connected to the outer side of the wheel hub and can move axially relative to the wheel hub.

[0021] Through the above structural arrangement, the rotating shaft of the motor of the brake of the present invention is not subjected to axial force, thereby becoming a split electromagnetic brake without axial force, thereby reducing damage to the bearing.

[0022] As a further improvement of the present invention, there is a clearance fit between the armature and the rotating shaft.

[0023] As a further improvement of the present invention, the hub and the rotating shaft are connected by interference fit.

[0024] As a further improvement of the present invention, a shaft shoulder is provided on the rotating shaft corresponding to the contact position between the hub and the armature.

[0025] As a further improvement of the present invention, the inner diameter of the secondary friction plate is larger than the outer diameter of the wheel hub.

[0026] The present invention provides a motor including the split brake.

[0027] The motor provided by the present invention is equipped with a split brake, and the main friction plate and the auxiliary friction plate are rubbed against each other by gluing the auxiliary friction plate to the rear end cover. The auxiliary friction plate is made of a material with certain elasticity and high wear resistance, such as polyurethane. The elastic deformation of the auxiliary friction plate is used to compensate for the deviation in verticality between the rear end cover and the main friction plate, thereby preventing damage to the main friction plate caused by excessive verticality deviation. The friction between the main and auxiliary friction plates increases the friction coefficient relative to the friction plate and the metal, thereby reducing the armature pressure, reducing the spring rigidity, and also reducing the winding power. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a cross-sectional view of a brake in the prior art;

[0030] Figure 2 is a cross-sectional view of the split brake of the present invention;

[0031] Figure 3 It is the assembly dimension chain of the split brake of the present invention;

[0032] Figure 4 Schematic diagram of vertical deviation of the primary and secondary friction plates of the split brake of the present invention when the secondary friction plate is made of rigid material;

[0033] Figure 5 Schematic diagram of vertical deviation of the primary and secondary friction plates of the split brake according to the present invention when the secondary friction plate is made of elastic material;

[0034] Figure 6 This is a schematic diagram of the structure when the main friction plate directly rubs against the rear end cover;

[0035] Figure 7 It is a structural schematic diagram of the main friction plate and the auxiliary friction plate of the split brake of the present invention.

[0036] In the figure: 1. Rear end cover; 2. Auxiliary friction plate; 3. Wheel hub; 4. Rotating shaft; 5. Main friction plate; 6. Rubber ring; 7. Armature; 8. Brake stator assembly; 9. Friction plate; h0, axial length from the brake mating surface of the rear end cover to the plane of the glued auxiliary friction plate; h1, thickness of the auxiliary friction plate; h2, thickness of the main friction plate; h3, thickness of the armature. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0038] Example 1:

[0039] In order to solve the problem of small braking torque of split brake, such as Figure 2 As shown, the present invention provides a split electromagnetic brake, which is a braking mechanism applied to a rotating mechanism (such as a motor device, etc.). Specifically, the split brake includes an armature 7, a primary friction plate 5, an auxiliary friction plate 2 and a rear end cover 1; wherein:

[0040] The main friction plate 5 is located on one side of the armature 7. When the armature 7 moves, it can drive the main friction plate 5 to move;

[0041] The secondary friction plate 2 is installed on the side of the rear end cover 1 facing the main friction plate 5. When the main friction plate 5 moves to the position of the secondary friction plate 2, friction is generated between the two, thereby braking. The friction between the primary and secondary friction plates 2 increases the friction coefficient relative to the friction plate and the metal, thereby reducing the pressure on the armature 7, reducing the spring rigidity, and also reducing the winding power, thereby reducing the leakage magnetic field caused by the saturation of the brake magnetic circuit.

[0042] When the brake is not working, the main friction plate 5 and the auxiliary friction plate 2 are in a separated state; when the brake is working, the armature 7 is attracted and moves toward the side of the rear end cover 1, and at the same time pushes the main friction plate 5 to move to a state of contact and friction with the auxiliary friction plate 2 until it is in a braking state.

[0043] In this embodiment, the rear end cover 1, the auxiliary friction plate 2, the primary friction plate 5 and the armature 7 are all coaxial structures and are arranged side by side in sequence.

[0044] The split brake provided by the present invention has a secondary friction plate 2 glued to the rear end cover 1, realizing bilateral friction (primary friction between the armature and the main friction plate, and secondary friction between the main friction plate and the secondary friction plate). This not only reduces the loss of the friction plate caused by the vertical deviation of the rear end cover 1, but also increases the friction torque, resulting in a large braking torque, thereby solving the problems of reduced braking torque, friction plate loss, and small unilateral friction braking torque caused by the vertical deviation between the friction plate and the rear end cover 1.

[0045] Since the rear end cover 1 is made of metal material, such as aluminum alloy, and its hardness is greater than that of the friction plate, in order to facilitate the fixation of the auxiliary friction plate 2, in this embodiment, a receiving groove is provided on the rear end cover 1, and the auxiliary friction plate 2 is placed in the receiving groove.

[0046] Through the structural arrangement, the connecting strength between the secondary friction plate 2 and the rear end cover 1 can be increased, and the braking stability during friction braking can be ensured.

[0047] In order to improve the braking effect and ensure the service life of the brake, in the embodiment, the thickness of the secondary friction plate 2 is greater than the depth of the accommodating groove, and through the structural arrangement, part of the structure of the secondary friction plate 2 is located outside the accommodating groove, that is, protrudes from the surface of the rear end cover 1, so as to facilitate the friction braking between the secondary friction plate 2 and the primary friction plate 5.

[0048] In the embodiment, in order to prevent the wear of the rubber ring 6, the secondary friction plate 2 cannot be in direct contact with the rubber ring 6, and the position is staggered in the radial direction, so in the embodiment, the diameter of the primary friction plate 5 is greater than the diameter of the secondary friction plate 2, and through the structural arrangement, the diameter of the primary friction plate 5 is increased, and the braking torque is improved.

[0049] It should be noted that in order to prevent the primary friction plate 5 from being in contact and friction with the rear end cover 1, and causing the secondary friction plate 2 to lose its function, as shown in Figure 2 , the rear end cover 1 is further provided with a relief step outside the accommodating groove, and through the relief step, the primary friction plate 5 and the rear end cover 1 are prevented from being in contact and friction.

[0050] Compared with the integral brake, the split brake cancels the baffle, so that the primary friction plate 5 can be in direct contact with the secondary friction plate 2 on the rear end cover 1, and the function of the baffle is realized by the rear end cover 1. Compared with the integral brake, the column sleeve is cancelled, the radial space of the primary friction plate 5 is increased, the outer diameter of the primary friction plate 5 can be appropriately increased, the braking torque is improved, and the service life of the friction plate is increased. In addition, the number of parts and assembly processes is reduced, and the cost is reduced.

[0051] In addition, it should be noted that the material of the rear end cover 1 is generally aluminum alloy, and the hardness is relatively large compared with the friction plate, as shown in Figure 6 , if the perpendicularity deviation of the rear end cover 1 and the primary friction plate 5 is large, the primary friction plate 5 will be severely worn. Therefore, in order to solve the problem, the secondary friction plate 2 is glued on the rear end cover 1, the primary friction plate and the secondary friction plate are in mutual friction, the secondary friction plate 2 is made of polyurethane or other materials with certain elasticity and high wear resistance, as shown in Figure 4 , 5 and Figure 7 , the perpendicularity deviation of the rear end cover 1 and the primary friction plate 5 is compensated by the elastic deformation of the secondary friction plate 2, and the damage to the primary friction plate 5 caused by the large perpendicularity deviation is prevented.

[0052] Embodiment 2:

[0053] When the existing brake armature 7 is attracted, the friction plate rotates synchronously with the rotating shaft 4, and the friction plate is in direct contact with the armature 7 and the baffle. Long-time operation causes certain wear of the friction plate. In order to solve this problem, as shown in Figure 2 In this embodiment, in order to reduce the friction loss caused by synchronous rotation of the main friction plate 5, a wear-resistant piece is arranged on the outer circumference of the main friction plate 5.

[0054] The thickness of the wear-resistant piece is greater than the thickness of the main friction plate, thereby forming a wear-resistant and supporting effect. It should be noted that the wear-resistant piece is made of a material with low friction coefficient, good elasticity and good wear resistance.

[0055] Specifically, the wear-resistant piece can be a whole-circle rubber ring 6 or a plurality of rubber blocks arranged at intervals. The whole-circle rubber ring 6 refers to a circular rubber ring 6 sleeved on the entire outer circumference of the main friction plate 5. The rubber block can be a block structure and is arranged at intervals on the entire outer circumference of the main friction plate 5.

[0056] The following will be described in detail taking the wear-resistant piece as the rubber ring 6 as an example.

[0057] The rubber ring 6 is arranged on the outer circumference of the main friction plate 5, and in order to be able to support the main friction plate 5 sufficiently and reduce the friction loss, in this embodiment, the thickness of the rubber ring 6 is greater than the thickness of the main friction plate 5. It should be noted that the thickness referred to here refers to the thickness in the axial direction of the rotating shaft 4 as shown in Figure 2 .

[0058] The present application glues the rubber ring 6 on the outer circumference of the main friction plate 5, and the thickness of the rubber ring 6 is slightly greater than that of the main friction plate 5, which supports the main friction plate 5, so that the main friction plate 5 has a certain gap with the armature 7 and the rear end cover 1 when the brake is powered on, thereby reducing the friction loss caused by synchronous rotation of the main friction plate 5 and the rotating shaft 4. By arranging the rubber ring 6 to support the main friction plate 5, vibration caused by eccentricity or installation problems of the main friction plate 5 can also be prevented, and the problem of abnormal noise caused by collision with the armature 7 or the rear end cover 1 can also be prevented.

[0059] The rubber material of the rubber ring 6 can be selected from materials such as nitrile rubber or silicone rubber, which have low friction coefficient, good elasticity and good wear resistance.

[0060] Embodiment 3:

[0061] In this embodiment, the brake structure is further limited, and further includes a rotating shaft 4 and a hub 3.

[0062] As shown in Figure 1As shown, the rotating shaft 4 of the conventional split brake is fixedly connected with the wheel hub 3, and when braking, the friction plate is located on the wheel hub and is fixedly connected, so that the axial thrust of the friction plate cannot be transmitted to the bearing of the rotating shaft 4, thereby causing the rotating shaft 4 and the bearing to bear a large axial force, which exceeds the limit value of the axial force borne by the deep groove ball bearing, and affects the service life of the bearing, and the split brake without axial force provided in the present application reduces the damage to the bearing.

[0063] The rotating shaft 4 is a motor rotating shaft and sequentially passes through the rear end cover 1 and the armature 7; since the secondary friction plate 2 and the primary friction plate 5 are located between the armature 7 and the rear end cover 1, the secondary friction plate 2 and the primary friction plate 5 are also sleeved on the rotating shaft 4; further, the brake stator assembly 8 is further included, which is sleeved on the rotating shaft 4 and located on the side of the armature 7 away from the primary friction plate 5.

[0064] The wheel hub 3 is sleeved on the rotating shaft 4 and located between the rear end cover 1 and the armature 7.

[0065] Further, the primary friction plate 5 is formedly connected to the outer side of the wheel hub 3 and can axially move relative to the wheel hub 3.

[0066] In the embodiment, the thickness of the primary friction plate 5 is equal to the thickness of the wheel hub 3. The thickness referred to herein is the thickness in the axial direction of the rotating shaft 4.

[0067] In addition, the formed connection refers to a kind of shaft-hub connection mode formed by using non-circular section shaft in corresponding shape hub hole, which is a connection mode in prior art.

[0068] Through the above structure, when the primary friction plate 5 is extruded by the armature 7, since it can axially move relative to the wheel hub 3, the axial thrust on the primary friction plate 5 will not be transmitted to the wheel hub 3, and thus will not be transmitted to the rotating shaft 4, so that the rotating shaft 4 of the motor of the brake of the present application is not subjected to axial force, and becomes a split electromagnetic brake without axial force, which reduces the damage to the bearing, and the brake also realizes double-sided friction and improves the braking torque; the structure is simplified, the volume of the brake is reduced, and the number of parts is reduced.

[0069] In the embodiment, the armature 7 and the rotating shaft 4 are gap-fitted.

[0070] The wheel hub 3 and the rotating shaft 4 are connected in interference fit, and this connection mode does not need to use other fixing parts, simplifies the structure, saves time in assembly, reduces the number of parts, and reduces the cost.

[0071] In order to achieve axial limitation of the hub 3, a shaft shoulder is provided on the rotating shaft 4 corresponding to the contact position between the hub 3 and the armature 7. During installation, the right end face of the hub 3 contacts or approaches the end face of the armature 7, and the right end limitation is achieved by the shaft shoulder.

[0072] like Figure 2 As shown, the inner diameter of the secondary friction plate 2 is larger than the outer diameter of the wheel hub 3.

[0073] Example 4:

[0074] like Figure 1-Figure 7 As shown, the present invention provides a motor including a split brake, wherein the split brake mainly includes a rear end cover 1, an auxiliary friction plate 2, a wheel hub 3, a rotating shaft 4, a main friction plate 5, a rubber ring 6, an armature 7, and a brake stator assembly 8.

[0075] The wheel hub 3 and the rotating shaft 4 are interference fit and are positioned by the shoulder of the rotating shaft 4. The main friction plate 5 and the wheel hub 3 are connected by a form to transmit torque, and the main friction plate 5 can move axially on the wheel hub 3. When braking, the main friction plate 5 moves toward the rear end cover 1 under the action of the armature 7, and is squeezed with the secondary friction plate 2 to achieve braking.

[0076] A rubber ring 6 is glued to the outer circumference of the primary friction plate 5. To reduce friction, the rubber ring 6 can also be replaced with rubber blocks evenly distributed around the circumference, as long as they provide support. To reduce friction, the axial height of the rubber ring 6 must be smaller than the gap between the armature 7 and the rear end cover 1. To support the primary friction plate 5, the axial height of the rubber ring 6 (the thickness along the axial direction of the rotating shaft 4) must be greater than the thickness of the primary friction plate 5. To prevent wear of the rubber ring 6, the secondary friction plate 2 must avoid direct contact with the rubber ring 6 and must be radially staggered.

[0077] The material of the secondary friction plate 2 needs to have a certain degree of elasticity and high wear resistance, and can ensure long-term stable operation of the equipment in some high-intensity and high-wear environments, such as polyurethane material, TPU material, nitrile rubber, etc.

[0078] A step (accommodation groove) is machined on the rear end cover 1. Glue is applied to the contact area between the secondary friction plate 2, and then the secondary friction plate 2 is placed in place to ensure a secure bond between the two. The elastic deformation of the secondary friction plate 2 compensates for any deviation in perpendicularity between the rear end cover 1 and the primary friction plate 5, eliminating the need for brake running-in and preventing damage to the primary friction plate 5 caused by excessive perpendicularity deviation. This also increases the friction area between the primary and secondary friction plates, improving friction torque.

[0079] The perpendicularity deviation between the rear end cover 1 and the primary friction plate 5 is relative. Deviation of one or both components will affect braking performance, causing a sharp decrease in the contact area between them. The secondary friction plate 2 is made of an elastic material, which can be elastically deformed to form a perfect fit with the primary friction plate 5, eliminating the need for running-in and allowing for direct use.

[0080] like Figure 3 As shown, during assembly, the gap between the armature 7 and the main friction plate 5 needs to be strictly controlled at about 0.1mm~0.2mm. Therefore, the axial length h0 from the rear end cover brake mating surface to the glued auxiliary friction plate plane, the auxiliary friction plate thickness h1, the main friction plate thickness h2, and the armature thickness h3 have high precision requirements. The tolerances of each dimension h0-h3 need to be strictly controlled so that the gap value h0-h1-h2-h3 of the main friction plate 5 is within 0.1~0.2mm, ensuring that the main friction plate 5 can rotate freely when the armature 7 is attracted.

[0081] The motor provided by the present invention is equipped with a split electromagnetic brake. The auxiliary friction plate 2 is glued to the rear end cover 1 to achieve mutual friction between the main friction plate 5 and the auxiliary friction plate 2. The auxiliary friction plate 2 is made of a material with certain elasticity and high wear resistance such as polyurethane. The elastic deformation of the auxiliary friction plate 2 is used to compensate for the vertical deviation between the rear end cover 1 and the main friction plate 5, thereby preventing damage to the main friction plate 5 caused by excessive vertical deviation. The friction between the main and auxiliary friction plates 2 increases the friction coefficient relative to the friction plate and the metal, thereby reducing the pressure on the armature 7, reducing the spring rigidity, and also reducing the winding power, thereby reducing the leakage magnetic flux caused by the saturation of the brake magnetic circuit.

[0082] First of all, it should be noted that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.

[0083] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0085] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0086] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0087] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0088] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A split brake, characterized in that: It includes an armature, a main friction plate, an auxiliary friction plate and a rear end cover; wherein: The main friction plate is located on one side of the armature; The auxiliary friction plate is mounted on a side of the rear end cover facing the main friction plate; When the brake is not in operation, the primary friction plate and the secondary friction plate are in a separated state; when the brake is in operation, the armature can push the primary friction plate and the secondary friction plate into contact and friction to form a braking state; Part of the structure of the secondary friction plate protrudes from the surface of the rear end cover; It also includes a wear-resistant part arranged on the outer circumference of the main friction plate; The thickness of the wear-resistant part in the axial direction is greater than the thickness of the main friction plate, so that when the brake is energized, a certain gap is formed between the main friction plate and the armature and the rear end cover.

2. The split brake according to claim 1, characterized in that: The rear end cover is provided with a receiving groove, and the auxiliary friction plate is placed in the receiving groove.

3. The split brake according to claim 2, characterized in that: The thickness of the secondary friction plate in the axial direction is greater than the depth of the accommodating groove.

4. The split brake according to claim 1, characterized in that: The diameter of the primary friction plate is greater than the diameter of the secondary friction plate.

5. The split brake according to claim 1, characterized in that: The wear-resistant part is a full-circle rubber ring or a plurality of rubber blocks arranged at intervals.

6. The split brake according to claim 1, characterized in that: It also includes a rotating shaft and a hub, wherein: The rotating shaft passes through the rear end cover and the armature in sequence; The wheel hub is sleeved on the rotating shaft and is located between the rear end cover and the armature; The main friction plate is formed and connected to the outer side of the wheel hub and can move axially relative to the wheel hub.

7. The split brake according to claim 6, characterized in that: The hub and the rotating shaft are connected by interference fit.

8. The split brake according to claim 6, characterized in that: A shaft shoulder is provided on the rotating shaft corresponding to a contact position between the hub and the armature.

9. The split brake according to claim 6, characterized in that: The inner diameter of the secondary friction plate is greater than the outer diameter of the wheel hub.

10. A motor, characterized in that: The invention comprises a split brake as described in any one of claims 1 to 9.

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