A torque transmission component and electromagnetic brake

Abstract

The present invention provides a torque transmission component and an electromagnetic brake, wherein the torque transmission component comprises an ultra-thin friction plate, a brake wheel and a stopper; the brake wheel is used for circumferentially limiting connection with the motor shaft; the ultra-thin friction plate is circumferentially limiting connection with the brake wheel; the ultra-thin friction plate comprises a surface friction layer and a reinforced core plate made of carbon fiber coated with the surface friction layer; the stopper with circumferential position limitation can be relatively close to or away from the friction plate. The electromagnetic brake comprises a stator and a cover plate, the torque transmission component is sandwiched between the stator and the cover plate and an elastic member is provided to realize the return of the ultra-thin friction plate. The ultra-thin friction plate formed by the reinforced core plate made of carbon fiber and the surface friction layer made of resin matrix friction material of this electromagnetic brake reduces the size of the entire electromagnetic brake to meet the needs of miniaturized electrical equipment, and while reducing the size, it reduces unnecessary power and reduces the temperature rise during operation.

Description

Technical Field

[0001] The present invention relates to the field of brake components, and in particular to a torque transmission component and an electromagnetic brake. Background Art

[0002] At present, with the needs of industrial segmentation development, the requirements for spring-loaded electromagnetic brakes (hereinafter referred to as brakes) required on various servo motors are not the same, but the overall structure is similar, as follows Figure 1 Among them, with the development needs of miniaturized electrical equipment, especially in the small robot industry, the size of the electromagnetic brake needs to be reduced by half or even more than two-thirds compared with before, while the braking torque does not decrease or decreases slightly. At the same time, there are also strict requirements on power and temperature rise.

[0003] Moreover, the existing conventional electromagnetic brakes are often miniaturized by increasing the brake power, thereby increasing the current. However, the increased power will cause the product temperature to rise sharply, resulting in a decrease in the torque stability of the brake under working conditions, and also affecting the product life. Summary of the invention

[0004] The present invention provides a torque transmission component and an electromagnetic brake, aiming to solve the above-mentioned problems existing in the torque transmission component and the electromagnetic brake in the prior art.

[0005] The present invention is achieved in that:

[0006] A torque transmission assembly comprises an ultra-thin friction plate, a brake wheel and a stopper;

[0007] The brake wheel is used to be connected to the motor shaft in a circumferential limiting manner;

[0008] The ultra-thin friction plate is circumferentially limitedly connected to the brake wheel;

[0009] The ultra-thin friction plate comprises a surface friction layer and a reinforced core plate made of carbon fiber covered by the surface friction layer;

[0010] The stopper with circumferential position limitation can be relatively close to or away from the friction plate.

[0011] In one embodiment of the present invention, it further comprises a first guide member arranged perpendicular to the ultra-thin friction plate;

[0012] The stop member is provided with a second guide member that cooperates with the first guide member;

[0013] The first guide member cooperates with the second guide member so that the stop member can axially approach or move away from the friction plate.

[0014] In one embodiment of the present invention, the reinforced core plate includes a carbon fiber cloth core layer and a hardness enhancing coating covering the surface of the carbon fiber cloth core layer.

[0015] In one embodiment of the present invention, the reinforced core plate is sandwiched between two sheets of the surface friction layers, and the reinforced core plate is pressed and fixed to the two sheets of the surface friction layers.

[0016] In one embodiment of the present invention, the thickness of the ultra-thin friction plate is 1.5-5 mm.

[0017] An electromagnetic brake comprises a stator, an elastic member, a cover plate and the above-mentioned torque transmission assembly;

[0018] The torque transmission assembly is sandwiched between the cover plate and the stator;

[0019] The stopper comprises an armature, and an electromagnetic coil for cooperating with the armature is arranged in the stator;

[0020] The elastic member is also provided on one side of the stator facing the armature, and the elastic member enables the armature to always have a movement tendency to approach the ultra-thin friction plate;

[0021] The cover plate and the stator are relatively fixedly arranged.

[0022] In one embodiment of the present invention, the cover plate is further provided with bolts;

[0023] The bolt passes through the cover plate and is threadedly connected to the stator to fix the relative positions of the cover plate and the stator.

[0024] In one embodiment of the present invention, the bolt is arranged perpendicular to the ultra-thin friction plate, and a bushing is axially sleeved outside the bolt;

[0025] The armature is provided with a guide groove which cooperates with the bushing.

[0026] In an embodiment of the present invention, a mounting hole for the motor shaft to pass through is provided at the center of the brake wheel, and the brake wheel and the motor shaft are interference fit through the mounting hole.

[0027] In one embodiment of the present invention, the outer edge of the brake wheel is set to be square, and the center of the ultra-thin friction plate is provided with a square hole that matches the outer edge of the brake wheel.

[0028] The beneficial effects of the present invention are as follows: through the electromagnetic brake provided by the present invention, the ultra-thin friction plate formed by the reinforced core plate made of carbon fiber and the surface friction layer made of resin matrix friction material reduces the size of the entire electromagnetic brake to meet the needs of miniaturized electrical equipment, and while reducing the size, reduces unnecessary power and reduces the temperature rise during operation. Compared with the torque in the existing electromagnetic brake parameters, less raw materials are used and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 is a cross-sectional view of an electromagnetic brake provided by an embodiment of the present invention;

[0031] Figure 2 It is a state diagram of voltage and electromagnetic force when the existing electromagnetic brake is used;

[0032] Figure 3 1 is a state diagram of voltage and electromagnetic force when the electromagnetic brake provided by an embodiment of the present invention is in use.

[0033] Icon: 1-stator; 2-armature; 3-friction plate; 4-brake wheel; 5-cover plate; 6-elastic part; 7-motor shaft; 8-bushing; 9-bolt. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact with each other, or may include the first and second features not being in direct contact with each other but being in contact with each other through another feature therebetween.

[0038] Example

[0039] This embodiment provides an electromagnetic brake. Figure 1 , the electromagnetic brake comprises a stator 1, an elastic member 6, a cover plate 5 and a torque transmission assembly;

[0040] Among them, the torque transmission component includes an ultra-thin friction plate 3, a brake wheel 4 and a stop member. The stop member is circumferentially limited and can only approach or move away from the ultra-thin friction plate 3 axially. The brake wheel 4 is circumferentially limitedly connected to the motor shaft 7, and the ultra-thin friction plate 3 is circumferentially limitedly connected to the brake wheel 4.

[0041] In this embodiment, a mounting hole for the motor shaft 7 to pass through is provided at the center of the brake wheel 4, and the brake wheel 4 and the motor shaft 7 are interference-fitted through the mounting hole. The outer edge of the brake wheel 4 is set to be square, and the center of the ultra-thin friction plate 3 is provided with a square hole that matches the outer edge of the brake wheel 4. The square outer edge of the brake wheel 4 matches the square hole of the ultra-thin friction plate 3, so that the brake wheel 4 and the ultra-thin friction plate 3 are connected in a circumferential limited manner.

[0042] That is, when the motor shaft 7 rotates, the brake wheel 4 and the ultra-thin friction plate 3 are driven to rotate together. If the stop member and the ultra-thin friction plate 3 are separated from each other, the motor shaft 7 can rotate freely. If the stop member is in close contact with the ultra-thin friction plate 3, a friction force is generated between the circumferentially fixed brake member and the ultra-thin friction plate 3 to prevent the rotation of the ultra-thin friction plate 3, and the torque is transmitted to the motor shaft 7, so that the motor shaft 7 is braked.

[0043] In order to reduce the thickness of the friction plate 3 and the weight of the friction plate 3 , the ultra-thin friction plate 3 includes a surface friction layer and a reinforced core plate made of carbon fiber covered by the surface friction layer.

[0044] In this embodiment, a reinforced core plate is sandwiched between two surface friction layers, and the reinforced core plate and the two surface friction layers are pressed and fixed by a press.

[0045] The reinforced core plate includes a carbon fiber cloth center layer and a hardness enhancing coating covering the surface of the carbon fiber cloth center layer. The hardness enhancing coating is sprayed on the surface of the carbon fiber cloth and then air-dried to make the reinforced core plate have sufficient hardness. Moreover, by setting the hardness enhancing coating, the compatibility of the reinforced core plate and the surface friction layer can be improved, and the integrity of the ultra-thin friction plate 3 can be improved. According to the adjustment of the hardness enhancing coating formed by hot melt glue, the bonding strength between the reinforced core plate and the surface friction layer can be greater than 100MPa.

[0046] The use of the reinforced core plate can reduce the thickness of the entire ultra-thin friction plate 3. The thickness of the ultra-thin friction plate 3 can be 1.5-5 mm. Specifically, in the present embodiment, the thickness of the ultra-thin friction plate 3 is 3 mm, which is significantly reduced compared with the thickness of the conventional friction plate 3, and the eccentricity is greatly reduced.

[0047] Moreover, the reinforced core plate with carbon fiber cloth as the matrix can be easily cut and shaped, and can be easily cut into a relatively small outer diameter size, so it can be applied to small electromagnetic brakes to reduce the size of the electromagnetic brakes.

[0048] The surface friction layer provided in this embodiment is made of a resin-based friction material. The density of the resin-based friction material is approximately 2g / cm3, which is roughly equivalent to the density of the reinforced core plate. When the ultra-thin friction plate 3 rotates, the noise and rapid wear of the friction plate 3 due to the eccentric center of gravity will be greatly reduced.

[0049] Specifically, the torque transmission assembly is sandwiched between the cover plate 5 and the stator 1, and the cover plate 5 and the stator 1 are relatively fixedly arranged. When the stopper contacts the ultra-thin friction plate 3, the cover plate 5 is located at the end of the ultra-thin friction plate 3 away from the stopper, that is, when the stopper presses the ultra-thin friction plate 3, the cover plate 5 provides pressure due to the interaction. Since the torque transmission assembly provided in this embodiment is directly applied to the electromagnetic brake, the armature 2 of the electromagnetic brake directly forms the stopper.

[0050] The stator 1 is provided with an electromagnetic coil for cooperating with the armature 2. The stator 1 is also provided with an elastic member 6 formed by a compression spring on the side facing the armature 2. The elastic member 6 makes the armature 2 always have a tendency to move closer to the ultra-thin friction plate 3; and when the electromagnetic coil is energized, it can also generate a tendency for the armature 2 to move away from the ultra-thin friction plate 3. As the electromagnetic coil increases the suction force on the armature 2, the armature 2 is eventually separated from the ultra-thin friction plate 3, so that the ultra-thin friction plate 3 is in a free state, and the motor shaft 7 can also rotate. When the electromagnetic coil is not energized, due to the disappearance of the suction force of the electromagnetic coil, the elastic force of the elastic member 6 makes the armature 2 close to the ultra-thin friction plate 3 and transmits the braking torque of the armature 2 to the ultra-thin friction plate 3, and then to the motor shaft 7, so that the motor shaft 7 is braked.

[0051] Specifically, in order to achieve relative fixation between the stator 1 and the cover plate 5, the electromagnetic brake also includes a bolt 9, the rod of the bolt 9 passes through the corresponding hole on the cover plate 5 and approaches the stator 1, and then the rod of the bolt 9 is threadedly matched with the threaded hole on the stator 1 to achieve relative fixation between the stator 1 and the cover plate 5.

[0052] In order to make the armature 2 approach or move away from the ultra-thin friction plate 3 in the axial direction, a first guide is provided to guide the armature 2. In this embodiment, since a bolt 9 is fixedly provided perpendicular to the ultra-thin friction plate 3, the bolt 9 can directly serve as the first guide. In order to reduce sliding friction, a bushing 8 is sleeved on the outside of the bolt 9. Accordingly, a guide groove matching the bushing 8 is provided on the armature 2 as the second guide. The armature 2 is displaced along the axial direction of the bolt 9 by the guidance of the bolt 9.

[0053] Since the electromagnetic brake provided by the present invention adopts a reinforced core plate made of carbon fiber, a resin-based friction material having great compatibility with the reinforced core plate can be used. This resin-based friction material has a considerable friction coefficient, and comprehensive utilization thereof can reduce the overall volume of the electromagnetic brake.

[0054] Another beneficial effect brought about by the reduction in the overall volume of the electromagnetic brake is that since the volume of the armature 2 and the stator 1 is reduced, the holding voltage during operation becomes lower. Under the low holding voltage, the armature 2 can be fitted to the stator 1.

[0055] Under low holding voltage, the power of the electromagnetic brake becomes smaller and the heat becomes lower, which is beneficial to the continuous operation of the system.

[0056] Figure 2 A diagram showing the voltage and electromagnetic force state when using an existing electromagnetic brake. Figure 3The voltage and electromagnetic force state diagram when the electromagnetic brake provided by this embodiment is used is shown in FIG. The electromagnetic brake provided by this embodiment can use PWM control technology to achieve low voltage holding.

[0057] The electromagnetic brake provided by the present invention has an ultra-thin friction plate 3 formed by a reinforced core plate made of carbon fiber and a surface friction layer made of a resin-based friction material, which reduces the size of the entire electromagnetic brake to meet the needs of miniaturized electrical equipment, and reduces unnecessary power and temperature rise during operation while reducing the size. When the torque is similar to that of the existing electromagnetic brake parameters, less raw materials are used and the cost is reduced.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electromagnetic brake, comprising a stator, an elastic member, a cover plate and a torque transmission assembly; The torque transmission assembly includes an ultra-thin friction plate, a brake wheel and a stopper; The brake wheel is used to be connected to the motor shaft in a circumferential limiting manner; The ultra-thin friction plate is circumferentially limitedly connected to the brake wheel; The ultra-thin friction plate comprises a surface friction layer and a reinforced core plate made of carbon fiber covered by the surface friction layer; The stopper with circumferential position restriction can be relatively close to or away from the friction plate; The torque transmission assembly is sandwiched between the cover plate and the stator; The stopper comprises an armature, and an electromagnetic coil for cooperating with the armature is arranged in the stator; The elastic member is also provided on one side of the stator facing the armature, and the elastic member enables the armature to always have a movement tendency to approach the ultra-thin friction plate; The cover plate and the stator are relatively fixedly arranged; The torque transmission assembly further comprises a first guide member arranged perpendicularly to the ultra-thin friction plate; The stop member is provided with a second guide member that cooperates with the first guide member; The first guide member cooperates with the second guide member so that the stop member can axially approach or move away from the friction plate; The reinforced core plate includes a carbon fiber cloth core layer and a hardness enhancing coating covering the surface of the carbon fiber cloth core layer; The two surface friction layers are sandwiched with the reinforced core plate, and the reinforced core plate is pressed and fixed with the two surface friction layers; The thickness of the ultra-thin friction plate is 1.5-4 mm.

2. The electromagnetic brake according to claim 1, characterized in that The cover plate is also provided with bolts; The bolt passes through the cover plate and is threadedly connected to the stator to fix the relative positions of the cover plate and the stator.

3. The electromagnetic brake according to claim 2, characterized in that: The bolt is arranged perpendicular to the ultra-thin friction plate, and a bushing is axially sleeved on the outer side of the bolt; The armature is provided with a guide groove which cooperates with the bushing.

4. The electromagnetic brake according to claim 2, characterized in that: A mounting hole for the motor shaft to pass through is arranged at the center of the brake wheel, and the brake wheel and the motor shaft are interference-fitted through the mounting hole.

5. The electromagnetic brake according to claim 1, characterized in that The outer edge of the brake wheel is arranged in a square shape, and the center of the ultra-thin friction plate is provided with a square hole matched with the outer edge of the brake wheel.

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