Silent electromagnetic brake

Abstract

This invention discloses a silent electromagnetic brake. The designed silent engagement mechanism solves the machining difficulty of the countersunk hole depth of the damping pad, allowing for a balance between the silent damping force and the electromagnetic attraction. It can provide corresponding silent damping force according to the magnitude of the electromagnetic attraction at each station, thereby achieving a silent engagement balance for the entire brake. In the designed silent braking mechanism, the fluororubber damper is compressed, acting as a radial force on the armature hole wall, resulting in low resistance to the reciprocating motion of the armature. Multiple such mechanisms on the armature ensure effective balance whether the brake is engaged or de-energized. Each hole contains multiple fluororubber dampers; when compressed, the outer wall of the fluororubber damper forms a spindle-shaped spherical surface that contacts the armature hole wall, effectively absorbing shock and reducing noise. Because multiple iron washers are placed in the armature holes, the armature movement will not be hindered. The fluororubber dampers have good temperature resistance, long service life, and a certain degree of elasticity, ensuring that the adjustable bolt will not loosen during the reciprocating motion of the armature.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic brake technology, specifically a silent electromagnetic brake. Background Technology

[0002] Electromagnetic brakes, due to their small size, fast response, and sensitive action, are reliable and ideal actuators for automating complete machines (equipment) and are now widely used in various fields. For certain specialized industries, such as medical testing equipment, stage machinery, and passenger elevators, low noise levels (below 50 dBA) are required. However, electromagnetic brakes operate with two actions: energization and engagement (electromagnetic attraction overcomes spring force to release the brake) and de-energization and braking (when power is off, the electromagnetic force disappears, and the spring force applies the brake). Both processes generate significant noise for a short period, reaching up to 110 dBA. Therefore, we must employ noise reduction measures that are effective and do not affect other performance indicators of the electromagnetic brake, ensuring safety, reliability, and a long lifespan.

[0003] See appendix Figure 5 and 6 The diagram shows the basic mechanism of a brake. Its working principle is as follows: The magnetic yoke with the coil installed is called an electromagnet (also called a chuck). When the coil is energized, the chuck generates a strong attraction force to hold the armature and compress the spring, so that the installation air gap δ between the chuck and the armature is transferred to the friction surface of the brake disc. At this time, the brake disc can rotate with the motor shaft, which is called the energized engagement process. When the power is off, the attraction force of the chuck disappears, and the armature is released from the chuck under the action of the spring (spring force). At this time, the brake disc is pressed by the armature, and the air gap δ between the chuck and the armature is restored, which is called the de-energized braking process.

[0004] In the prior art, see Appendix Figure 7 and Figure 8This paper presents a structural diagram of an existing electromagnetic brake noise reduction technology. A groove is machined on the magnetic yoke's engagement surface, with the groove depth less than the thickness of the noise-reducing damper. This allows the noise-reducing damper to protrude from the yoke's engagement surface during installation. The purpose is to accelerate the armature's engagement when energized, preventing collisions between the moving armature and the yoke, thus eliminating engagement noise. However, this noise reduction measure has several significant drawbacks: the noise-reducing damper is typically made of a temperature-resistant, non-metallic material with a certain degree of hardness. During compression, it undergoes both elastic and plastic deformation, making it difficult to accurately determine the free extension amount. Furthermore, the required noise-reducing damper value varies depending on the desired noise reduction effect. If the extension is too large, the armature cannot be fully engaged when energized, the brake disc cannot be fully released, and the brake cannot function properly. If the extension is too small, metallic collision noise will still occur between the armature and the yoke's ends, resulting in poor noise reduction. More importantly, the noise generated when the brake is de-energized is uncontrolled, making the product unsuitable for use. Therefore, this invention proposes a noise-reducing electromagnetic brake to address these problems. Summary of the Invention

[0005] The purpose of this invention is to provide a silent electromagnetic brake, which aims to solve the problems mentioned in the background art.

[0006] This invention is achieved through the following technical solution:

[0007] This invention relates to a silent electromagnetic brake, comprising a brake body, a braking silence mechanism, and a pull-in silence mechanism;

[0008] The brake body includes an armature, a magnetic yoke, a coil, a spring, a brake disc, a spline sleeve, a round-headed flat key, a shaft retaining ring, mounting screws, hollow bolts, a motor end cover, a bearing, and a motor shaft. When energized, the magnetic yoke attracts the armature. The brake body is also provided with multiple countersunk holes.

[0009] The suction and silent mechanism includes a set screw with adhesive anti-loosening coating, an adjusting set screw, a metal pad, and a silent damper. The bottom of the silent damper is provided with a metal pad with a positioning boss. The adjusting set screw is used to fix the metal pad. The set screw with adhesive anti-loosening coating is used to prevent the adjusting set screw from loosening. The metal pad and the silent damper are accommodated inside the countersunk hole.

[0010] The braking and noise reduction mechanism includes an adjustable bolt, multiple fluororubber dampers, and multiple iron washers. The magnetic yoke has a threaded hole on its attraction surface. Multiple fluororubber dampers and iron washers are fitted onto the outer wall of the adjustable bolt and then accommodated inside the threaded hole. The outer diameters of the fluororubber dampers and iron washers are the same, and the outer diameters of the fluororubber dampers and iron washers are 0.2-0.3 mm smaller than the diameter of the armature hole.

[0011] Preferably, the yoke is wound with the coil, and when the coil is energized, the yoke and the coil form an electromagnet.

[0012] Preferably, the electromagnet's attraction pulls the armature and compresses the spring, at which point the mounting air gap δ between the electromagnet and the armature shifts to the friction surface of the brake disc.

[0013] Preferably, the brake disc rotates with the motor shaft.

[0014] Preferably, when the power is off, the electromagnet's attraction disappears, the armature disengages under the spring's restoring force, the brake disc is pressed by the armature, and the air gap δ between the electromagnet and the armature is restored.

[0015] Preferably, the plurality of countersunk holes are arranged in a circular pattern, and the depth of the countersunk holes is greater than the installation thickness of the metal pad and the silent damper.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The designed suction and noise reduction mechanism solves the processing difficulty of the countersunk hole depth of the damping pad (the original depth was too deep to achieve the noise reduction effect, and too shallow the brake could not be fully attracted, resulting in the brake not working properly); this method can balance the noise reduction damping force and the electromagnetic attraction force; it can provide the corresponding noise reduction damping force according to the magnitude of the electromagnetic attraction force at each station, thereby achieving a balance of noise reduction during the entire brake engagement.

[0018] 2. Advantages of the braking and noise reduction mechanism: The fluororubber dampers in the braking and noise reduction mechanism are compressed, and the force acting on the armature hole wall is radial, resulting in low resistance to the reciprocating motion of the armature; there are many of these mechanisms on the armature, which can achieve effective balance whether the armature is energized or de-energized; each hole contains multiple fluororubber dampers, and when compressed, the outer wall of the fluororubber damper forms a spindle-shaped spherical surface that contacts the armature hole wall, which can effectively absorb shock and reduce noise; since multiple iron washers are placed in the armature hole, the armature movement will not be stuck; the fluororubber dampers have good temperature resistance, long service life, and a certain degree of elasticity, and the adjustable bolt will not loosen during the reciprocating motion of the armature. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 for Figure 1 Sectional view along the AA direction;

[0021] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0022] Figure 4for Figure 2 Enlarged view of a section at point B in the middle;

[0023] Figure 5 This is a schematic diagram of the brake without a silent function in Comparative Example 1.

[0024] Figure 6 This is a cross-sectional view of the brake without the silent function in Comparative Example 1.

[0025] Figure 7 This is a schematic diagram of the silent brake in Comparative Example 2;

[0026] Figure 8 This is a cross-sectional view of the silent brake in Comparative Example 2.

[0027] In the diagram: 1. Braking silencer mechanism; 2. Armature; 3. Magnetic yoke; 4. Coil; 5. Spring; 6. Brake disc; 7. Spline sleeve; 8. Round-headed flat key; 9. Shaft retaining ring; 10. Suction silencer mechanism; 11. Mounting screw; 12. Hollow bolt; 13. Motor end cover; 14. Bearing; 15. Motor shaft; 16. Set screw with adhesive anti-loosening coating; 17. Adjustable set screw; 18. Metal washer; 19. Silencing damper; 20. Adjustable bolt; 21. Fluororubber damper; 22. Iron washer; 23. Silencing pad. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0030] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Comparative Example 1:

[0034] See appendix Figure 5 and Figure 6 The diagram shows the structure of a non-silent brake. Its working principle is as follows: When the magnetic yoke 3 is installed with the coil 4, it is called an electromagnet (also called a chuck). When the coil 4 is energized, the electromagnet generates a strong attraction force to hold the armature 2 and compress the spring 5 (brake spring), so that the installation air gap δ between the electromagnet and the armature 2 is transferred to the friction surface of the brake disc 6. At this time, the brake disc 6 can rotate together with the motor shaft 15. This is the energized engagement process. When the power is off, the electromagnet attraction force disappears, and the armature 2 is disengaged from the electromagnet under the action of the spring 5 (spring force). At this time, the brake disc 6 is pressed by the armature 2, and the air gap δ between the electromagnet and the armature 2 is restored. This is the de-energized braking process.

[0035] Comparative Example 2:

[0036] See appendix Figure 7 and Figure 8 This is a schematic diagram of a prior art electromagnetic brake with a silent function. A groove is machined on the engagement surface of the magnetic yoke 3, with the groove depth less than the thickness of the silent pad 23. This allows the silent pad 23 to protrude from the engagement surface of the magnetic yoke 3 during installation. The purpose is to accelerate the engagement of the armature 2 when energized, preventing collision between the moving armature 2 and the magnetic yoke 3, thus eliminating engagement noise. However, this silent measure has the following significant drawbacks: the silent pad 23 is generally a temperature-resistant and relatively hard non-metallic material. During compression, it undergoes both elastic and plastic deformation, making it difficult to accurately determine the free extension of the silent pad 23. Furthermore, the required value of the silent pad 23 varies depending on the desired silent effect, depending on the location of the electromagnet (where the magnetic yoke 3 and coil 4 are energized). If the extension is too large after power is applied, the armature 2 cannot be fully attracted when power is applied, the brake disc 6 cannot be fully released, and the brake cannot work properly; if the extension is too small, the armature 2 and the two ends of the magnetic yoke 3 will still produce a metallic collision sound, and the noise reduction effect is not good; more importantly, the noise generated when the brake is de-energized is not restrained, and the product does not meet the usage requirements.

[0037] Example:

[0038] Please see Figures 1 to 4This invention provides a silent electromagnetic brake technical solution: a silent electromagnetic brake includes a brake body, a braking silence mechanism 1, and a suction silence mechanism 10; the brake body includes an armature 2, a magnetic yoke 3, a coil 4, a spring 5, a brake disc 6, a spline sleeve 7, a round-headed flat key 8, a shaft retaining ring 9, mounting screws 11, hollow bolts 12, a motor end cover 13, a bearing 14, and a motor shaft 15. After being energized, the magnetic yoke 3 attracts the armature 2. The brake body also has multiple countersunk holes; the suction silence mechanism 10 includes a glued anti-loosening set screw 16, an adjusting set screw 17, a metal washer 18, and a silence damper 19. The bottom of the silence damper 19 is provided with a... The positioning boss has a metal pad 18, and an adjusting set screw 17 is used to fix the metal pad 18. A set screw 16 with adhesive anti-loosening is used to adjust the anti-loosening function of the set screw 17. The metal pad 18 and the silent damper 19 are accommodated inside the countersunk hole. The braking silent mechanism 1 includes an adjustable bolt 20, multiple fluororubber dampers 21 and multiple iron washers 22. The magnetic yoke 3 has a threaded hole on its attraction surface. Multiple fluororubber dampers 21 and iron washers 22 are fitted on the outer wall of the adjustable bolt 20 and then accommodated inside the threaded hole. The outer diameters of the fluororubber dampers 21 and iron washers 22 are the same, and the outer diameters of the fluororubber dampers 21 and iron washers 22 are 0.2-0.3 mm smaller than the hole diameter of the armature 2.

[0039] In this embodiment, the present invention addresses the noise issue of engagement by replacing the prior art (Comparative Example 2) with an engagement noise reduction mechanism 10, and by adding a braking noise reduction mechanism 1 to address the noise generated during the braking process. Specifically:

[0040] How the suction and noise reduction mechanism 10 works:

[0041] The implementation of the suction-and-silence mechanism 10: A metal pad 18 with a positioning boss is added to the bottom of the silent damper 19, and two internal hexagonal flat-end set screws are provided. The adjustment set screw 17 without glue is used to fix the metal pad 18 with the positioning boss, and the set screw 16 with glue is used to prevent the metal pad 18 and the silent damper 19 from loosening. Since the silent damper 19 is a non-metallic pad with a certain degree of elasticity, its outer diameter is smaller than the diameter of the countersunk hole of the magnetic yoke 3. In order to prevent the silent damper 19 from being eccentric in the hole, and to allow the non-metallic silent damper 19 to be compressed and retract into the countersunk hole of the magnetic yoke 3, a metal pad 18 with a positioning boss needs to be added. Another advantage of the metal pad 18 is that it prevents the adjustment set screw 17 without glue from directly contacting the silent damper 19, so that the silent damper 19 will not be damaged during the pushing process.

[0042] The suction-silencing mechanism 10 is adjustable, enabling the air gap δ value to be 0 when the brake is energized and engaged, while the magnetic yoke 3 and armature 2 surfaces do not produce a collision sound. The specific operation is as follows: According to the size of the brake, countersunk holes are machined at multiple stations ( Figure 1 There are eight such workstations in the middle), and the depth of the countersunk hole is greater than or equal to the attached hole. Figure 2 The thickness after the metal pad 18 and the silent damper 19 are installed is sufficient. The M8 thread passes through the countersunk hole. During assembly, first place the metal pad 18 and the silent damper 19 into the countersunk hole, and then install the entire brake. Adjustment method: After the brake is assembled, set the air gap value δ of the brake. Turn on the power to make the magnetic yoke 3 attract the armature 2. At this time, there will be a knocking sound. After it is attracted, turn the adjusting set screw 17 clockwise to tighten the metal pad 18 and the silent damper 19. Then adjust the other positions in sequence. With the help of the voltage regulator, make the silent damper 19 force balance the excess electromagnetic attraction force, so as to accurately achieve silent engagement and meet the requirement that the air gap value δ is completely transferred to the brake disc 6 after engagement, so that the brake can maintain normal operation and achieve the effect of silent engagement. After adjustment, screw in the anti-loosening set screw 16 with adhesive to prevent it from slipping out. This structure solves the difficulty of machining the depth of the damping pad countersunk hole (the original depth was too deep and did not achieve the silent effect, while it was too shallow and the brake could not be fully engaged, resulting in the brake not working properly). This method can balance the force of the silent damping 19 with the electromagnetic attraction force. It can provide the corresponding force of the silent damping 19 according to the magnitude of the electromagnetic attraction force at each station, thereby achieving a silent balance when the entire brake is engaged.

[0043] Working principle of braking and noise reduction mechanism 1:

[0044] The implementation of the braking and noise reduction mechanism 1: An M6 thread is machined on the engaging end face of the magnetic yoke 3, with a thread depth sufficient to allow the adjustable M6 bolt 20 to compress the fluororubber damper 21 to its screw-in depth. Several thick iron washers 22 and several fluororubber dampers 21 are spaced apart and fitted onto the outer wall of the adjustable bolt 20 (see attached diagram). Figure 4 As shown), there are five thick iron washers 22 and three fluororubber dampers 21. In the free state, the outer diameters of the iron washers 22 and the fluororubber dampers 21 are basically the same, both 0.2-0.3mm smaller than the hole diameter of the armature 2. The purpose is to allow the iron washers 22 and the fluororubber dampers 21 to be smoothly installed into the hole of the armature 2. The adjustable bolt 20 is connected to the thread on the end face of the magnetic yoke 3. Adjustment method: Use a wrench to turn the adjustable bolt 20 to press the iron washers 22. At this time, the fluororubber dampers 21 become thinner and the outer diameter increases, which puts a certain lateral pressure on the hole wall of the armature 2. At this time, when the brake is de-energized, the armature 2 is pushed open by the spring 5 to press the brake disc 6, and the collision sound disappears, achieving the braking noise reduction effect. As can be seen from the working principle of the electromagnetic brake, the armature 2 is a moving part that makes reciprocating linear motion. When restricting the degree of freedom of the armature 2, it is necessary to avoid offsetting the spring force of the brake as much as possible, that is, there should not be a large axial force to offset the spring force.

[0045] Advantages of the braking noise reduction mechanism 1: 1. The fluororubber damper 21 in the braking noise reduction mechanism 1 is compressed, and the force acting on the wall of the armature 2 hole is radial, resulting in low resistance to the reciprocating motion of the armature 2; 2. There are many of these mechanisms on the armature 2, which can achieve effective balance whether the armature is energized or de-energized; 3. There are multiple fluororubber dampers 21 in each hole. When compressed, the outer wall of the fluororubber damper 21 forms a spindle-shaped spherical surface that contacts the wall of the armature 2 hole, which can effectively absorb shock and reduce noise; 4. Since multiple iron washers 22 are placed in the holes of the armature 2, the movement of the armature 2 will not be stuck; 5. The fluororubber damper 21 has good temperature resistance, long service life, and a certain degree of elasticity, and the adjustable bolt 20 will not loosen during the reciprocating motion of the armature 2.

[0046] Furthermore, a coil 4 is wound around the magnetic yoke 3. When the coil 4 is energized, the magnetic yoke 3 and the coil 4 form an electromagnet.

[0047] In this embodiment, a coil 4 is wound around the magnetic yoke 3. When the coil 4 is energized, the magnetic yoke 3 and the coil 4 are combined to form an electromagnet. The magnetic attraction force of the electromagnet is switched on and off by switching the power on and off.

[0048] Furthermore, the electromagnet's attraction pulls the armature 2 and compresses the spring 5. At this time, the installation air gap δ between the electromagnet and the armature 2 is transferred to the friction surface of the brake disc 6.

[0049] In this embodiment, the magnetic yoke 3 with coil 4 installed is called an electromagnet (also called a chuck). When coil 4 is energized, the electromagnet generates a strong attraction force to hold armature 2 and compress spring 5, causing the installation air gap δ between the electromagnet and armature 2 to transfer to the friction surface of brake disc 6. At this time, brake disc 6 can rotate together with motor shaft 15. This is the energized engagement process. When the power is off, the electromagnet attraction force disappears, and armature 2 is disengaged from the electromagnet under the action of spring 5 (spring force). At this time, brake disc 6 is pressed by armature 2, and the air gap δ between electromagnet and armature 2 is restored. This is the de-energized braking process.

[0050] For further details, please refer to Figure 2 The brake disc 6 rotates with the motor shaft 15.

[0051] In this embodiment, the motor shaft 15 is driven by the motor, and the rotation of the motor shaft 15 drives the brake disc to rotate.

[0052] Furthermore, when the power is off, the electromagnet's attraction disappears, and the armature 2 disengages under the restoring force of the spring 5. The brake disc 6 is pressed tightly by the armature 2, and the installation air gap δ between the electromagnet and the armature 2 is restored.

[0053] In this embodiment, an M6 thread is machined on the engaging end face of the magnetic yoke 3. The thread depth is sufficient to allow the adjustable bolt 20 to compress the fluororubber damper 21 to the desired depth. Several thick iron washers 22 and several fluororubber dampers 21 are spaced apart and fitted onto the outer wall of the adjustable bolt 20 (see attached diagram). Figure 4 As shown), there are five thick iron washers 22 and three fluororubber dampers 21. In the free state, the outer diameters of the iron washers 22 and the fluororubber dampers 21 are basically the same, both 0.2-0.3mm smaller than the hole diameter of the armature 2. The purpose is to allow the iron washers 22 and the fluororubber dampers 21 to be smoothly installed into the hole of the armature 2. The adjustable bolt 20 is connected to the thread on the end face of the magnetic yoke 3. Adjustment method: Use a wrench to turn the adjustable bolt 20 to tighten the iron washers 22. At this time, the fluororubber dampers 21 become thinner and the outer diameter increases, which puts a certain lateral pressure on the hole wall of the armature 2. When the brake is de-energized, the armature 2 is pushed open by the spring 5 to press the brake disc 6. The collision sound disappears, and the braking noise is achieved. As can be seen from the working principle of the electromagnetic brake, the armature 2 is a moving part that makes reciprocating linear motion. When restricting the degree of freedom of the armature 2, it is necessary to avoid offsetting the spring force of the brake as much as possible, that is, there should not be a large axial force to offset the spring force.

[0054] For further details, please refer to Figure 2 Multiple countersunk holes are distributed in a circular pattern, and the depth of the countersunk holes is greater than the installation thickness of the metal pad 18 and the silent damper 19.

[0055] In this embodiment, countersunk holes are machined at multiple stations according to the size of the brake. Figure 1 There are eight such workstations in the middle), and the depth of the countersunk hole is greater than or equal to the attached hole. Figure 2 The thickness after the combination of the metal pad 18 and the silent damper 19 is sufficient.

[0056] Working principle and usage process of the present invention: Working mode of the suction and noise reduction mechanism 10:

[0057] The implementation of the suction-and-silence mechanism 10: A metal pad 18 with a positioning boss is added to the bottom of the silent damper 19, and two internal hexagonal flat-end set screws are provided. The adjustment set screw 17 without glue is used to fix the metal pad 18 with the positioning boss, and the set screw 16 with glue is used to prevent the metal pad 18 and the silent damper 19 from loosening. Since the silent damper 19 is a non-metallic pad with a certain degree of elasticity, its outer diameter is smaller than the diameter of the countersunk hole of the magnetic yoke 3. In order to prevent the silent damper 19 from being eccentric in the hole, and to allow the non-metallic silent damper 19 to be compressed and retract into the countersunk hole of the magnetic yoke 3, a metal pad 18 with a positioning boss needs to be added. Another advantage of the metal pad 18 is that it prevents the adjustment set screw 17 without glue from directly contacting the silent damper 19, so that the silent damper 19 will not be damaged during the pushing process.

[0058] The suction-silencing mechanism 10 is adjustable, enabling the air gap δ value to be 0 when the brake is energized and engaged, while the magnetic yoke 3 and armature 2 surfaces do not produce a collision sound. The specific operation is as follows: According to the size of the brake, countersunk holes are machined at multiple stations ( Figure 1 There are eight such workstations in the middle), and the depth of the countersunk hole is greater than or equal to the attached hole. Figure 2 The thickness after the metal pad 18 and the silent damper 19 are installed is sufficient. The M8 thread passes through the countersunk hole. During assembly, first place the metal pad 18 and the silent damper 19 into the countersunk hole, and then install the entire brake. Adjustment method: After the brake is assembled, set the air gap value δ of the brake. Turn on the power to make the magnetic yoke 3 attract the armature 2. At this time, there will be a knocking sound. After it is attracted, turn the adjusting set screw 17 clockwise to tighten the metal pad 18 and the silent damper 19. Then adjust the other positions in sequence. With the help of the voltage regulator, make the silent damper 19 force balance the excess electromagnetic attraction force, so as to accurately achieve silent engagement and meet the requirement that the air gap value δ is completely transferred to the brake disc 6 after engagement, so that the brake can maintain normal operation and achieve the effect of silent engagement. After adjustment, screw in the anti-loosening set screw 16 with adhesive to prevent it from slipping out. This structure solves the difficulty of machining the depth of the damping pad countersunk hole (the original depth was too deep and did not achieve the silent effect, while it was too shallow and the brake could not be fully engaged, resulting in the brake not working properly). This method can balance the force of the silent damping 19 with the electromagnetic attraction force. It can provide the corresponding force of the silent damping 19 according to the magnitude of the electromagnetic attraction force at each station, thereby achieving a silent balance when the entire brake is engaged.

[0059] Working principle of braking and noise reduction mechanism 1:

[0060] The implementation of the braking and noise reduction mechanism 1: An M6 thread is machined on the engaging end face of the magnetic yoke 3, with a thread depth sufficient to allow the adjustable M6 bolt 20 to compress the fluororubber damper 21 to its screw-in depth. Several thick iron washers 22 and several fluororubber dampers 21 are spaced apart and fitted onto the outer wall of the adjustable bolt 20 (see attached diagram). Figure 4 As shown), there are five thick iron washers 22 and three fluororubber dampers 21. In the free state, the outer diameters of the iron washers 22 and the fluororubber dampers 21 are basically the same, both 0.2-0.3mm smaller than the hole diameter of the armature 2. The purpose is to allow the iron washers 22 and the fluororubber dampers 21 to be smoothly installed into the hole of the armature 2. The adjustable bolt 20 is connected to the thread on the end face of the magnetic yoke 3. Adjustment method: Use a wrench to turn the adjustable bolt 20 to press the iron washers 22. At this time, the fluororubber dampers 21 become thinner and the outer diameter increases, which puts a certain lateral pressure on the hole wall of the armature 2. At this time, when the brake is de-energized, the armature 2 is pushed open by the spring 5 to press the brake disc 6, and the collision sound disappears, achieving the braking noise reduction effect. As can be seen from the working principle of the electromagnetic brake, the armature 2 is a moving part that makes reciprocating linear motion. When restricting the degree of freedom of the armature 2, it is necessary to avoid offsetting the spring force of the brake as much as possible, that is, there should not be a large axial force to offset the spring force.

[0061] Advantages of the braking noise reduction mechanism 1: 1. The fluororubber damper 21 in the braking noise reduction mechanism 1 is compressed, and the force acting on the wall of the armature 2 hole is radial, resulting in low resistance to the reciprocating motion of the armature 2; 2. There are many of these mechanisms on the armature 2, which can achieve effective balance whether the armature is energized or de-energized; 3. There are multiple fluororubber dampers 21 in each hole. When compressed, the outer wall of the fluororubber damper 21 forms a spindle-shaped spherical surface that contacts the wall of the armature 2 hole, which can effectively absorb shock and reduce noise; 4. Since multiple iron washers 22 are placed in the holes of the armature 2, the movement of the armature 2 will not be stuck; 5. The fluororubber damper 21 has good temperature resistance, long service life, and a certain degree of elasticity, and the adjustable bolt 20 will not loosen during the reciprocating motion of the armature 2.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A silent electromagnetic brake, characterized in that: It includes a brake body, a braking noise reduction mechanism (1), and a suction noise reduction mechanism (10). The brake body includes an armature (2), a magnetic yoke (3), a coil (4), a spring (5), a brake disc (6), a spline sleeve (7), a round-headed flat key (8), a shaft retaining ring (9), mounting screws (11), hollow bolts (12), a motor end cover (13), a bearing (14), and a motor shaft (15). When energized, the magnetic yoke (3) attracts the armature (2). The brake body is also provided with multiple countersunk holes. The suction-and-silence mechanism (10) includes a set screw (16) with adhesive coating to prevent loosening, an adjusting set screw (17), a metal pad (18), and a silent damper (19). The bottom of the silent damper (19) is provided with the metal pad (18) with a positioning boss. The adjusting set screw (17) is used to fix the metal pad (18). The set screw (16) with adhesive coating to prevent loosening of the adjusting set screw (17) is used to prevent it from slipping. The metal pad (18) and the silent damper (19) are accommodated inside the countersunk hole. The braking and noise reduction mechanism (1) includes an adjustable bolt (20), multiple fluororubber dampers (21) and multiple iron washers (22). The magnetic yoke (3) has a threaded hole on its engagement surface. Multiple fluororubber dampers (21) and iron washers (22) are fitted on the outer wall of the adjustable bolt (20) and then accommodated inside the threaded hole. The outer diameters of the fluororubber dampers (21) and iron washers (22) are the same. The outer diameters of the fluororubber dampers (21) and iron washers (22) are 0.2-0.3 mm smaller than the hole diameter of the armature (2).

2. The silent electromagnetic brake according to claim 1, characterized in that: The yoke (3) is wound with the coil (4), and when the coil (4) is energized, the yoke (3) and the coil (4) form an electromagnet.

3. A silent electromagnetic brake according to claim 2, characterized in that: The electromagnet attracts the armature (2) and compresses the spring (5). At this time, the installation air gap δ between the electromagnet and the armature (2) is transferred to the friction surface of the brake disc (6).

4. A silent electromagnetic brake according to claim 3, characterized in that: The brake disc (6) rotates with the motor shaft (15).

5. A silent electromagnetic brake according to claim 4, characterized in that: When the power is off, the electromagnet's attraction disappears, and the armature (2) is disengaged under the restoring force of the spring (5). The brake disc (6) is pressed by the armature (2), and the installation air gap δ between the electromagnet and the armature (2) is restored.

6. A silent electromagnetic brake according to claim 1, characterized in that: The plurality of countersunk holes are distributed in a ring shape, and the depth of the countersunk holes is greater than the installation thickness of the metal pad (18) and the silent damper (19).

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