Electromagnetic brake device for a tubular motor

Abstract

This utility model discloses an electromagnetic braking device for a tubular motor, comprising a brake housing, an electromagnet, a brake seat, a spring, and a brake disc for connecting to the drive shaft of the tubular motor. The electromagnet is fixed in the brake housing. The brake seat is movably fitted in the brake housing and located between the electromagnet and the brake disc. The brake seat is provided with brake pads. When the electromagnet is energized, it drives the brake seat closer to the electromagnet. The spring is sleeved on the brake seat, with its two ends abutting against the brake housing and the brake seat respectively. The spring is used to drive the brake seat away from the electromagnet. The brake disc is arranged opposite to the brake seat, and the brake disc and the brake pads of the brake seat move in contact. This utility model avoids the spring occupying the radial space of the electromagnet, thereby helping to reduce the radial dimension of the electromagnetic braking device for a tubular motor.

Description

Technical Field

[0001] This utility model relates to the field of tubular motors, and in particular to an electromagnetic braking device for a tubular motor. Background Technology

[0002] Tubular motors, as power components, have advantages such as compact structure, large torque, and slow speed. Therefore, tubular motors are increasingly used in products such as roller shutters, sunshade systems, and projection screens that electrically complete lifting and lowering movements.

[0003] A tubular motor typically consists of a drive motor, an output shaft, a reduction gear, and a braking device. The braking device generally includes an electromagnet, a brake seat with brake pads, a spring positioned between the brake seat and the electromagnet, and a brake disc connected to the drive motor's shaft. The braking mechanism works as follows: Before the electromagnet is energized, the brake pads on the brake seat engage with the brake disc through friction, putting the tubular motor in a braking state. When the electromagnet is energized, it generates electromagnetic force that attracts the brake seat, causing it to overcome the spring force and move to disengage from the brake disc. At this point, the tubular motor is released from braking, and the rotation of the drive motor's shaft drives the output shaft. When the electromagnet is de-energized, it loses its electromagnetic force and no longer attracts the brake seat. The spring then returns to its original position, causing the brake pads to engage with the brake disc again through friction, thus braking the drive motor and putting the tubular motor in a braking state.

[0004] However, there is a problem with the existing tubular motor braking device, which is that the spring is inserted into the slot formed in the center of the electromagnet. This causes the spring to occupy the internal radial space of the electromagnet, resulting in a large radial dimension of the electromagnet, which is not conducive to reducing the radial dimension of the braking device. For example, the braking device disclosed in Chinese Patent CN103618409 A has the aforementioned problem.

[0005] In view of the above problems, it is necessary to study an electromagnetic braking device for a tubular motor that can avoid the spring occupying the radial space of the electromagnet, thereby helping to reduce the radial dimension of the electromagnetic braking device. Utility Model Content

[0006] The purpose of this invention is to provide an electromagnetic braking device for a tubular motor, which can avoid the spring occupying the radial space of the electromagnet, thereby helping to reduce the radial dimension of the electromagnetic braking device.

[0007] To achieve the above objectives, the solution of this utility model is: An electromagnetic braking device for a tubular motor includes a brake housing, an electromagnet, a brake seat, a spring, and a brake disc for connecting to the drive shaft of the tubular motor. The electromagnet is fixed in the brake housing. The brake seat is movably fitted in the brake housing and located between the electromagnet and the brake disc. The brake seat is provided with brake pads. When the electromagnet is energized, it drives the brake seat closer to the electromagnet. The spring is sleeved on the brake seat, with its two ends abutting against the brake housing and the brake seat respectively. The spring is used to drive the brake seat away from the electromagnet. The brake disc is disposed opposite to the brake seat, and the brake disc and the brake pads of the brake seat move in contact.

[0008] The brake housing has a retaining edge; the brake seat has an outwardly protruding edge; the spring is housed in the brake housing, with its two ends abutting against the retaining edge and the protruding edge, respectively.

[0009] The brake seat may include a seat body, an armature, and a brake pad, with the armature and brake pad respectively fitted at both ends of the seat body; the spring is sleeved on the seat body of the brake seat, with both ends of the spring abutting against the seat body and the brake housing respectively.

[0010] The base is made of plastic.

[0011] The armature is secured to the base with screws.

[0012] The end of the seat is provided with a protruding mating post, and the brake pad is tightly fitted onto the mating post.

[0013] The brake disc is rotatably fitted into the brake housing.

[0014] The brake disc is rotatably fitted into the brake housing via bearings.

[0015] The brake disc has a fitting portion and a limiting portion; a limiting ring is fixed inside the brake housing; the inner ring of the bearing fits onto the fitting portion of the brake disc, the side of the inner ring of the bearing closest to the brake seat abuts against the limiting portion of the brake disc, and the side of the outer ring of the bearing furthest from the brake seat abuts against the limiting ring.

[0016] The limiting ring is secured inside the brake housing by screws.

[0017] With the above solution, the spring of this utility model is sleeved on the brake seat and the two ends of the spring abut against the brake housing and the brake seat respectively. This arrangement can avoid the spring occupying the radial space of the electromagnet, thereby helping to reduce the radial dimension of the electromagnetic braking device of the tubular motor of this utility model. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is an exploded view of the structure of this utility model.

[0020] Figure 3 This is a cross-sectional view of the present invention.

[0021] Figure 4 for Figure 3 Enlarged view of point a.

[0022] Label Explanation: Brake housing 1, retaining edge 11, Electromagnet 2, Brake seat 3, brake pad 31, seat body 32, flange 321, mating post 322, armature 33. Spring 4, Brake disc 5, sleeve portion 51, limiting portion 52. Bearing 6, Limiting ring 7, Drive motor A, motor housing B. Implementation To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0023] like Figures 1 to 4 As shown, this utility model discloses an electromagnetic braking device for a tubular motor, which includes a brake housing 1, an electromagnet 2, a brake seat 3, a spring 4, and a brake disc 5 for connecting to the shaft of a drive motor A of the tubular motor; wherein, the electromagnet 2 is fixed in the brake housing 1; the brake seat 3 is movably fitted in the brake housing 1 and located between the electromagnet 2 and the brake disc 5, and the brake seat 3 is provided with a brake pad 31, and when the electromagnet 2 is energized, it drives the brake seat 3 to move closer to the electromagnet; the spring 4 is sleeved on the brake seat 3, and the two ends of the spring 3 abut against the brake housing 1 and the brake seat 3 respectively, and the spring 4 is used to drive the brake seat 3 away from the electromagnet 2; the brake disc 5 is arranged opposite to the brake seat 3, and the brake disc 5 and the brake pad 31 of the brake seat 3 are in movable contact.

[0024] The working principle of this utility model is as follows: When the electromagnet 2 is not energized, the brake seat 3, under the action of the spring 4, causes the brake pad 31 of the brake seat 3 to abut against the brake disc 5 connected to the rotating shaft of the drive motor A of the tubular motor, so that the tubular motor is in a braking state; when the electromagnet 2 is energized, the electromagnet 2 generates electromagnetic force to attract the brake seat 3, so that the brake seat 3 overcomes the spring force of the spring 4 and moves to disengage from the brake disc 5. At this time, the tubular motor 5 is released from the braking state, and the rotation of the rotating shaft of the drive motor A can drive the output shaft to rotate; when the electromagnet 2 is de-energized, the electromagnet 2 loses electromagnetic force and no longer attracts the brake seat 3. At this time, the spring 4 resets and pushes the brake seat 3 back to its original position, so that the brake pad 31 of the brake seat 3 abuts against the brake disc 5 again, thereby braking the drive motor A, so that the tubular motor is in a braking state. In this invention, the spring 4 is sleeved on the brake seat 3 and the two ends of the spring 3 abut against the brake housing 1 and the brake seat 3 respectively. This arrangement can avoid the spring 4 occupying the radial space of the electromagnet 2, thereby helping to reduce the radial dimension of the electromagnetic braking device of the tubular motor of this invention.

[0025] In an embodiment of this utility model, the brake housing 1 can be locked to the electromagnet 2 with screws, and the brake housing 1 and the drive motor A can be fixed together in the motor housing B.

[0026] In an embodiment of this utility model, the brake housing 1 may be provided with a retaining edge 11 for the spring 4 to abut against, and the brake seat 3 is provided with an outwardly protruding edge 321 for the spring 4 to abut against; the spring 4 is housed in the brake housing 1, and the two ends of the spring 4 abut against the retaining edge 11 and the protruding edge 321 respectively. The brake housing 1 has a limiting effect on the spring 4 and can effectively prevent the spring 4 from falling out.

[0027] In an embodiment of this utility model, the brake seat 3 may include a seat body 32, an armature 33, and a brake pad 31. The armature 33 and the brake pad 31 are respectively fitted to both ends of the seat body 32. This arrangement allows the seat body 32 to be made of plastic, reducing the amount of metal used in the brake seat 3 and lowering its cost. The armature 33 and the seat body 32 can be fastened together with screws. The end of the seat body 32 has a protruding mating post 322, and the brake pad 31 is tightly fitted onto the mating post 322. This arrangement simplifies the assembly of the armature 33 and the brake pad 31 with the seat body 32. The protruding edge 321 of the brake seat 3 can be provided on the seat body 32, and the spring 4 is fitted onto the seat body 32. The two ends of the spring 4 abut against the protruding edge 321 of the seat body 32 and the retaining edge 11 of the brake housing 1, respectively.

[0028] In this embodiment of the invention, the brake disc 5 is rotatably fitted into the brake housing 1 to prevent the brake disc 4 from falling off. Specifically, the brake disc 5 is rotatably fitted into the brake housing 1 via a bearing 6, allowing the brake disc 5 to rotate smoothly after disengaging from the brake pad 31. The brake disc 5 has a fitting portion 51 and a limiting portion 52. A limiting ring 7 is fixed inside the brake housing 1 and can be secured within the brake housing 1 with screws. The inner ring of the bearing 6 fits over the fitting portion 51 of the brake disc 5, with the inner ring of the bearing 51 abutting against the limiting portion 52 of the brake disc 5 on the side closer to the brake seat 3, and the outer ring of the bearing 6 abutting against the limiting ring 7 on the side farther from the brake seat 3. This configuration effectively prevents the bearing 6 and the brake disc 5 from falling off.

[0029] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. An electromagnetic braking device for a tubular motor, characterized in that: It includes a brake housing, an electromagnet, a brake seat, a spring, and a brake disc for connecting to the drive motor shaft of the tubular motor. The electromagnet is fixed in the brake housing; The brake seat is movably fitted into the brake housing and located between the electromagnet and the brake disc. The brake seat is equipped with brake pads. When the electromagnet is energized, it drives the brake seat to move closer to the electromagnet. The spring is fitted onto the brake seat, with its two ends abutting against the brake housing and the brake seat respectively. The spring is used to drive the brake seat away from the electromagnet. The brake disc and the brake seat are arranged opposite each other, and the brake pads of the brake disc and the brake seat move in contact.

2. The electromagnetic braking device for a tubular motor as described in claim 1, characterized in that: The brake housing has a retaining edge; the brake seat has an outwardly protruding edge; the spring is housed in the brake housing, with its two ends abutting against the retaining edge and the protruding edge, respectively.

3. An electromagnetic braking device for a tubular motor as described in claim 1 or 2, characterized in that: The brake seat may include a seat body, an armature, and a brake pad, with the armature and brake pad respectively fitted at both ends of the seat body; The spring is fitted onto the seat of the brake seat, with the two ends of the spring abutting against the seat and the brake housing, respectively.

4. The electromagnetic braking device for a tubular motor as described in claim 3, characterized in that: The base is made of plastic.

5. The electromagnetic braking device for a tubular motor as described in claim 3, characterized in that: The armature is secured to the base with screws.

6. The electromagnetic braking device for a tubular motor as described in claim 3, characterized in that: The end of the seat is provided with a protruding mating post, and the brake pad is tightly fitted onto the mating post.

7. An electromagnetic braking device for a tubular motor as described in claim 1 or 2, characterized in that: The brake disc is rotatably fitted into the brake housing.

8. The electromagnetic braking device for a tubular motor as described in claim 7, characterized in that: The brake disc is rotatably fitted into the brake housing via bearings.

9. The electromagnetic braking device for a tubular motor as described in claim 8, characterized in that: The brake disc has a sleeve portion and a limiting portion; a limiting ring is fixed inside the brake housing; The inner ring of the bearing is fitted onto the mounting portion of the brake disc, and the side of the inner ring of the bearing closest to the brake seat abuts against the limiting portion of the brake disc, while the side of the outer ring of the bearing furthest from the brake seat abuts against the limiting ring.

10. The electromagnetic braking device for a tubular motor as described in claim 9, characterized in that: The limiting ring is secured inside the brake housing by screws.

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