Friction brake assembly for electromagnetic brake

Abstract

The friction brake assembly comprises a brake disc and further comprises a friction block with soft magnetic performance and friction performance, one end of the friction block is provided with a friction block boss protruding in the peripheral direction to form a T-shaped structure, the brake disc is provided with a plurality of limiting through holes evenly distributed in the peripheral direction, and the limiting through holes are communicated with the friction block boss. The outer diameter of each friction block is smaller than the hole diameter of the corresponding limiting through hole, the outer diameter of each friction block boss is larger than the hole diameter of the corresponding limiting through hole, and the multiple friction blocks penetrate through the multiple limiting through holes correspondingly. According to the electromagnetic brake, two kinds of operation noise between the friction block and the armature and the cover plate and between the brake disc and the rotating shaft in the application process are fundamentally eliminated, the operation noise of the electromagnetic brake is remarkably reduced, and the product using comfort of a user is improved.

Description

Technical Field

[0001] The utility model relates to a partial structure of an electromagnetic brake, in particular to a friction braking assembly for an electromagnetic brake. Background Art

[0002] With the increasingly wide application range of brakes, users' requirements for brakes are no longer limited to braking performance such as torque magnitude, and noise has also become a key characteristic for evaluating products. Traditional electromagnetic brakes and permanent magnet brakes each have their own advantages and disadvantages. Due to the limitations of its braking structure itself, traditional electromagnetic brakes have always been unable to solve the problem of running noise. And because permanent magnet brakes have problems such as high price and difficult installation, the solution of replacing electromagnetic brakes with permanent magnet brakes with very low running noise cannot be adopted either. Therefore, the problem of relatively high running noise of traditional electromagnetic brakes has never been effectively solved.

[0003] The main reason for the relatively high running noise of traditional electromagnetic brakes is that: the brake disc is located between the armature and the cover plate and is connected to the rotating shaft. Since the brake disc (generally provided with friction plates on both sides) needs to move axially during braking to achieve the purpose of being clamped and braked by the armature and the cover plate, a transmission connection structure that can axially move relative to the rotating shaft but cannot rotate circumferentially relative to the rotating shaft is generally formed between the brake disc and the rotating shaft through transmission teeth or square wheels. The brake disc and the friction plates on both sides thereof are connected to the transmission teeth or square wheels together, which is generally called a friction braking assembly. During operation, the friction braking assembly is in a freely movable state axially. Therefore, the rotating brake disc will contact the armature or the cover plate, generating running friction noise, and the transmission teeth or square wheels will also collide with the rotating shaft during start-stop, generating collision noise.

[0004] As can be seen from the above, due to the structural limitations of the friction braking assembly, it is very difficult to overcome the above two running noises during the operation of traditional electromagnetic brakes through conventional solutions. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a friction braking assembly for an electromagnetic brake in which the brake disc does not need to move axially during operation to solve the above problems.

[0006] The utility model realizes the above purpose through the following technical solutions:

[0007] A friction braking assembly for an electromagnetic brake includes a brake disc, and further includes friction blocks with both soft magnetic properties and friction properties. One end of each friction block is provided with a friction block boss protruding outward in the circumferential direction to form a "T" - shaped structure. The brake disc is provided with a plurality of limit through - holes evenly distributed along the circumferential direction. The outer diameter of the friction block is smaller than the aperture of the limit through - hole, and the outer diameter of the friction block boss is larger than the aperture of the limit through - hole. A plurality of the friction blocks respectively pass through a plurality of the limit through - holes.

[0008] Preferably, in order to ensure sufficient circumferential rotational transmission strength between the friction block and the brake disc and at the same time have a sufficient friction coefficient, the friction block includes a soft magnetic metal block, a first friction plate and a second friction plate. One end of the soft magnetic metal block is provided with a boss protruding outward in the circumferential direction to form a "T" - shaped structure. The outer diameter of the first friction plate is smaller than that of the second friction plate. The first friction plate is arranged on the small - end face of the soft magnetic metal block and is adhesively connected. The second friction plate is arranged on the large - end face of the soft magnetic metal block and is adhesively connected.

[0009] Preferably, in order to make the connection strength between the first friction plate and the second friction plate and the soft magnetic metal block higher, a small - end groove is provided in the middle of the small - end face of the soft magnetic metal block. One end of the first friction plate is provided with a protruding first protrusion, and the first protrusion is placed in the small - end groove. A large - end groove is provided in the middle of the large - end face of the soft magnetic metal block. One end of the second friction plate is provided with a protruding second protrusion, and the second protrusion is placed in the large - end groove.

[0010] Preferably, in order to facilitate the installation of the friction block and the connection between the brake disc and the rotating shaft, a circular counter - sink is provided on one end face in the middle of the brake disc. A plurality of the friction blocks are evenly distributed on the circumference outside the circular counter - sink. The central through - hole of the brake disc passes through the center position of the bottom of the circular counter - sink. A plurality of mounting through - holes evenly distributed in the circumferential direction are provided on the bottom of the circular counter - sink at a position outside the central through - hole of the brake disc.

[0011] Preferably, in order to facilitate the connection between the brake disc and the rotating shaft and cooperate with the cover plate of the electromagnetic brake, an outward - protruding and circular brake - disc boss is provided at the other end in the middle of the brake disc. The friction - block boss is located on one side of the brake disc close to the brake - disc boss.

[0012] Preferably, the number of the mounting through - holes is three.

[0013] Preferably, the number of both the friction blocks and the limit through - holes is four.

[0014] The beneficial effects of the present utility model are as follows:

[0015] The utility model forms a friction braking assembly by assembling a brake disc with a plurality of friction blocks having both soft magnetic properties and friction properties. The friction blocks can axially move relative to the brake disc but cannot rotate circumferentially. During application, the friction blocks can be attracted by the electromagnetic force generated by the energized coil of the electromagnetic brake before operation and closely fit with the brake disc. In this way, the running friction noise generated between the friction blocks and the armature or cover plate of the electromagnetic brake due to the axial movement of the friction blocks during operation is avoided. At the same time, after the coil is de-energized, the friction blocks can axially move to realize the function of being clamped and braked by the armature and the cover plate, without affecting the braking effect. Moreover, a fixed connection can be adopted between the brake disc and the rotating shaft to form a rigid connection, and there is no collision noise between the brake disc and the rotating shaft during the start-stop process. Therefore, the two running noises between the friction blocks and the armature and cover plate, and between the brake disc and the rotating shaft are fundamentally eliminated, significantly reducing the running noise of the electromagnetic brake and improving the comfort of users using the product. Although there is a certain collision noise between the friction blocks and the brake disc during the process of the coil gaining and losing power, because the distance between the boss of the friction block and the brake disc is very small, this noise is very small and cannot be heard by users, without affecting the comfort of users using the product. Description of the Drawings

[0016] Figure 1 is a perspective view of the friction block of the friction braking assembly for the electromagnetic brake according to the utility model;

[0017] Figure 2 is a front view sectional view of the friction block of the friction braking assembly for the electromagnetic brake according to the utility model;

[0018] Figure 3 is a perspective view of the friction braking assembly for the electromagnetic brake according to the utility model;

[0019] Figure 4 is a front view sectional view of the friction braking assembly for the electromagnetic brake according to the utility model;

[0020] Figure 5 is a front view sectional view when the friction braking assembly for the electromagnetic brake according to the utility model is applied. Detailed Embodiment

[0021] The following further describes the utility model with reference to the drawings:

[0022] As Figures 1 - 4As shown in the figure, the friction braking assembly for an electromagnetic brake of the present utility model includes a brake disc 2, and further includes a friction block 1 having both soft magnetic properties and friction properties. One end of the friction block 1 is provided with a friction block boss protruding outward in the circumferential direction (not marked in the figure) to form a "T" - shaped structure. The brake disc 2 is provided with a plurality of limit through - holes (not marked in the figure) evenly distributed in the circumferential direction. The outer diameter of the friction block 1 is smaller than the aperture of the limit through - hole, and the outer diameter of the friction block boss is larger than the aperture of the limit through - hole. A plurality of friction blocks 1 respectively pass through the plurality of limit through - holes. Preferably, both the friction block 1 and the limit through - holes are four in number.

[0023] As Figures 1 - 4 shown, the present utility model also discloses the following various more optimized specific structures:

[0024] In order to make the friction block 1 have both soft magnetic properties and friction properties, and at the same time to ensure that there is sufficient circumferential rotation transmission strength and sufficient friction coefficient between the friction block 1 and the brake disc 2, the friction block 1 includes a soft magnetic metal block 12, a first friction plate 11, and a second friction plate 13. One end of the soft magnetic metal block 12 is provided with a boss protruding outward in the circumferential direction to form a "T" - shaped structure. The specific material of the soft magnetic metal block 12 is determined according to needs. For example, iron - silicon alloy (silicon steel sheet) or soft ferrite can be selected, preferably iron - silicon alloy. The outer diameter of the first friction plate 11 is smaller than the outer diameter of the second friction plate 13. The first friction plate 11 is disposed on the small - end face of the soft magnetic metal block 12 and is adhesively connected. The second friction plate 13 is disposed on the large - end face of the soft magnetic metal block 12 and is adhesively connected. The materials of the first friction plate 11 and the second friction plate 13 are generally high - molecular ternary composite materials, which are physical and chemical composites. It is composed of three major categories: high - molecular binder (resin and rubber), reinforcing fibers, and friction property regulators, and other compounding agents, and is made into products through a series of production processes, which are conventional friction materials.

[0025] In order to make the connection strength between the first friction plate 11 and the second friction plate 13 and the soft magnetic metal block 12 higher, a small - end groove (not marked in the figure) is provided in the middle of the small - end face of the soft magnetic metal block 12. One end of the first friction plate 11 is provided with a protruding first protrusion 15, and the first protrusion 15 is placed in the small - end groove. A large - end groove (not marked in the figure) is provided in the middle of the large - end face of the soft magnetic metal block 12. One end of the second friction plate 13 is provided with a protruding second protrusion 14, and the second protrusion 14 is placed in the large - end groove.

[0026] In order to facilitate the installation of the friction block 1 and facilitate the connection between the brake disc 2 and the rotating shaft (refer to Figure 5It is connected to the rotating shaft 4), and a circular counterbore 22 is provided on one end face of the middle part of the brake disc 2. A plurality of friction blocks 1 are evenly distributed on the circumference outside the circular counterbore 22. The central through hole 23 of the brake disc 2 passes through the center position of the bottom of the circular counterbore 22. A plurality of mounting through holes 21 evenly distributed in the circumferential direction are provided on the bottom of the circular counterbore 22 at a position outside the central through hole 23 of the brake disc 2. The number of mounting through holes 21 is preferably three.

[0027] To facilitate the connection between the brake disc 2 and the rotating shaft and cooperate with the cover plate of the electromagnetic brake (refer to Figure 5 the cover plate 8), an outwardly convex and circular brake disc boss 24 is provided at the other end of the middle part of the brake disc 2. The friction block boss is located on one side of the brake disc 2 close to the brake disc boss 24.

[0028] As Figures 1 - 5 shown, the preferred application mode of the present utility model is as follows: Assemble the friction braking assembly of the present utility model with other components of the electromagnetic brake. The specific structure is as follows: The armature 7 is located between the magnetic yoke 3 and the brake disc 2, the brake disc 2 is located between the armature 7 and the cover plate 8, the coil 5 and the compression spring 6 are respectively installed in the magnetic yoke 3. The friction block bosses of the plurality of friction blocks 1 are close to the cover plate 8 and meet the following conditions: When the coil 5 is powered off and the compression spring 6 pushes the armature 7 to press the plurality of friction blocks 1 against the cover plate 8, the distance between the friction block bosses of the friction blocks 1 and the brake disc 2 is less than the distance between the magnetic yoke 3 and the armature 7 (this distance is the working clearance); The rotating shaft 4 sequentially passes through the central through hole of the magnetic yoke 3, the central through hole of the armature 7, the central through hole of the brake disc 2 and the central through hole of the cover plate 8, and the brake disc 2 is fixedly connected to the rotating shaft 4 through a plurality of connecting screws 9. The brake disc boss 24 of the brake disc 2 is located in the central through hole of the cover plate 8; During normal operation, the coil 5 is powered on to generate an electromagnetic force to attract the armature 7 close to the magnetic yoke 3, and the distance between the armature 7 and the cover plate 8 increases. At the same time, the electromagnetic force attracts the soft magnetic metal blocks 12 of the plurality of friction blocks 1 to make the friction blocks 1 in close contact with the brake disc 2 and always fit together. The plurality of friction blocks 1 and the brake disc 2 rotate synchronously with the rotating shaft 4 between the armature 7 and the cover plate 8, which is the brake release state. During this process, there is no running noise between the friction blocks 1 and the armature 7 and the cover plate 8, and between the brake disc 2 and the rotating shaft 4; When braking is required, the coil 5 is powered off, the electromagnetic force disappears, and under the action of the compression spring 6, the armature 7 moves towards the cover plate 8, driving the plurality of friction blocks 1 to move axially until the plurality of friction blocks 1 are tightly clamped between the armature 7 and the cover plate 8. The plurality of friction blocks 1 quickly stop rotating, and through the rotational transmission function between the soft magnetic metal blocks 12 and the brake disc 2, the brake disc 2 and the rotating shaft 4 also quickly stop rotating under the action of friction force, realizing the braking function.

[0029] The above embodiments are only the preferred embodiments of the present utility model and do not limit the technical solutions of the present utility model. Any technical solutions that can be achieved on the basis of the above embodiments without creative efforts shall be regarded as falling within the scope of the patent rights of the present utility model.

Claims

1. A friction brake assembly for an electromagnetic brake, comprising a brake disc, characterized in that: It also includes a friction block with both soft magnetic properties and friction properties, one end of the friction block is provided with a friction block boss protruding in the circumferential direction to form a "T" shape structure, the brake disc is provided with a plurality of limiting through holes evenly distributed along the circumferential direction, the outer diameter of the friction block is smaller than the aperture of the limiting through hole, the outer diameter of the friction block boss is larger than the aperture of the limiting through hole, and the plurality of friction blocks respectively pass through the plurality of limiting through holes.

2. The friction brake assembly for electromagnetic brake according to claim 1, characterized in that: The friction block includes a soft magnetic metal block, a first friction plate and a second friction plate. One end of the soft magnetic metal block is provided with a boss protruding toward the peripheral direction to form a "T"-shaped structure. The outer diameter of the first friction plate is smaller than the outer diameter of the second friction plate. The first friction plate is arranged on the small end face of the soft magnetic metal block and is bonded and connected. The second friction plate is arranged on the large end face of the soft magnetic metal block and is bonded and connected.

3. The friction brake assembly for electromagnetic brake according to claim 2, characterized in that: A small end groove is provided in the middle of the small end surface of the soft magnetic metal block, and a raised first protrusion is provided at one end of the first friction plate, and the first protrusion is placed in the small end groove; a large end groove is provided in the middle of the large end surface of the soft magnetic metal block, and a raised second protrusion is provided at one end of the second friction plate, and the second protrusion is placed in the large end groove.

4. The friction brake assembly for electromagnetic brake according to any one of claims 1 to 3, characterized in that: A circular groove is provided on the end surface of one end of the middle part of the brake disc, and a plurality of friction blocks are evenly distributed on the circumference outside the circular groove. The central through hole of the brake disc passes through the center position of the bottom of the circular groove, and a plurality of mounting through holes evenly distributed in the circumferential direction are provided on the bottom of the circular groove outside the central through hole of the brake disc.

5. The friction brake assembly for electromagnetic brake according to claim 4, characterized in that: The other end of the middle part of the brake disc is provided with a circular brake disc boss, and the friction block boss is located on one side of the brake disc close to the brake disc boss.

6. The friction brake assembly for electromagnetic brake according to claim 4, characterized in that: There are three mounting through holes.

7. The friction brake assembly for electromagnetic brake according to any one of claims 1 to 3, characterized in that: There are four friction blocks and four limiting through holes.

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