A brake disc structure of a roller shutter motor

Abstract

The utility model discloses a kind of brake disc structures of roller shutter door motor, it includes disc body, two arc swing arms and two tension springs, the back of disc body is connected with brake pad, the middle of disc body is equipped with shaft seat, the middle of shaft seat is equipped with connecting shaft hole, the connecting shaft hole is double flat position structure;The front of disc body is equipped with two axial protruding positioning shafts in circumferential symmetry, two swing arms are symmetrically hinged on the positioning shaft, the corresponding end of two swing arms is respectively pulled tight by two tension springs, the shaft seat is equipped with two limit lugs in circumferential symmetry, the limit lug limits the swing arm between the front of disc body and limit lug. The utility model is easily assembled and high efficiency;Swing arm is installed using positioning shaft, and limit swing arm using limit lug, not only greatly convenient to install, and swing arm and positioning shaft gap can be controlled.

Description

Technical Field

[0001] This utility model relates to a brake disc structure for a roller shutter door motor. Background Technology

[0002] Roller shutter motors are equipped with braking systems. Existing braking systems have brake discs with anti-fall safety devices to prevent the roller shutter from falling rapidly. For example, a roller shutter motor with an anti-fall brake disc, as disclosed in Chinese Patent Publication No. CN208280881U, uses a tension spring to tighten two anti-fall bow arms. When the brake disc rotates at a low speed, the two anti-fall bow arms are closed under the action of the tension spring and do not have a braking effect. When the brake disc rotates at high speed, the anti-fall bow arms are thrown outward under the action of centrifugal force, causing the ratchet teeth on the anti-fall bow arms to mesh with the ratchet teeth on the brake base to generate braking and achieve the braking purpose. However, in this brake disc structure, firstly, the disc body's central shaft hole and shaft are connected by a keyway (14) and a key. If the braking force is too large, the sharp corner of the keyway (14) will break, and the keyway is difficult to assemble, requiring the key bar to be hammered. Secondly, the use of a single-sided tension spring (17) and a fixing pin (16) to connect the anti-fall bow arm will result in an imbalance of power and strong vibration, leading to unstable braking. At the same time, in order for the anti-fall bow arm to move freely, the fixing pin needs to leave a margin, which will inevitably result in space swing on the shaft, especially at the tension spring end, which will cause severe up-and-down swing. When the vibration is strong, the middle part will break. Summary of the Invention

[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a brake disc structure for a roller shutter door motor.

[0004] The technical solution adopted by this utility model to solve its technical problem is: A brake disc structure for a roller shutter door motor includes a disc body, two arched swing arms, and two tension springs. A brake pad is connected to the back of the disc body. A bearing seat is located in the middle of the disc body, and a connecting shaft hole is located in the middle of the bearing seat. The connecting shaft hole has a double-flat structure. Two axially protruding positioning shafts are symmetrically arranged on the front of the disc body around its periphery. The two swing arms are symmetrically hinged to the positioning shafts. The corresponding ends of the two swing arms are respectively tightened by two tension springs. A friction block that can cooperate with a motor brake seat is provided along the outer edge of the middle of each swing arm. Two limiting lugs are symmetrically arranged circumferentially on the bearing seat, and the limiting lugs limit the swing arms between the front of the disc body and the limiting lugs.

[0005] Preferably, there is a clearance space for two tension springs between the back of the disc body and the swing arm.

[0006] Preferably, the front of the disc body is symmetrically provided with two first support parts and two second support parts protruding along the axial direction, two positioning shafts are respectively located on the two first support parts, two second support parts are respectively located between the two first support parts, and the side of each swing arm abuts against the corresponding first support part and second support part.

[0007] Preferably, each friction block is located between the corresponding first support and second support.

[0008] The beneficial effects of this utility model are: the connecting shaft hole adopts a double flat structure, which solves the sharp corner problem and assembly problem of the keyway in the prior art, making assembly easy and efficient; the positioning shaft is used to install the swing arm, and the limiting lug limits the swing arm, which not only greatly facilitates the installation, but also allows the gap between the swing arm and the positioning shaft to be controlled. The limiting lug prevents excessive vibration force at the rear end of the swing arm. At the same time, the swing arm is balanced by double tension springs, so the swing arm will not move up and down too much, causing the middle to be stressed and break. The swing arm is always opened and closed within the limiting lug.

[0009] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the brake disc structure of the roller shutter door motor of the present invention is not limited to the embodiments. Attached Figure Description

[0010] Figure 1 This is a front view of the installation of a preferred embodiment of the present invention.

[0011] Figure 2 This is an exploded perspective view of a preferred embodiment of the present invention. Detailed Implementation

[0012] See the example. Figure 1 and Figure 2 As shown, the brake disc structure of a roller shutter door motor of this utility model includes a disc body 1, two arched swing arms 2 and 3, and two tension springs 4 and 5. The back of the disc body 1 is connected to a brake pad 6. The disc body 1 has a bearing seat 12 in the middle, and the bearing seat 12 has a connecting shaft hole 13 in the middle. The connecting shaft hole 13 has a double flat structure. The front of the disc body 1 has two axially protruding positioning shafts 7 and 8 symmetrically arranged around its periphery. The two swing arms 2 and 3 are symmetrically hinged to the positioning shafts 7 and 8. The corresponding ends of the two swing arms 2 and 3 are respectively tightened by the two tension springs 4 and 5. The outer end of the middle of each swing arm is provided with friction blocks 21 and 31 that can cooperate with the motor brake seat. The bearing seat 12 has two limiting lugs 14 and 15 symmetrically arranged around its periphery. The limiting lugs 14 and 15 limit the swing arms 2 and 3 between the front of the disc body 1 and the limiting lugs 14 and 15.

[0013] To facilitate the installation of the tension springs, a clearance space for two tension springs 4 and 5 is provided between the back of the disc body 1 and the swing arms 2 and 3. Specifically, the front of the disc body 1 is symmetrically provided with two first support portions 16 and 17 and two second support portions 18 and 19 protruding axially. Two positioning shafts 7 and 8 are respectively located on the two first support portions 16 and 17, and the two second support portions 18 and 19 are respectively located between the two first support portions 16 and 17. The side of each swing arm abuts against the corresponding first and second support portions. Each friction block is located between the corresponding first and second support portions.

[0014] The connecting shaft hole 13 of the double flat structure in this embodiment can solve the problems of torque transmission and installation alignment. Compared with the traditional keyway structure, there is no sharp corner problem, and there will be no sharp corner breakage due to excessive braking force. In addition, it is easy to assemble, does not require hammering the key bar, and has high assembly efficiency.

[0015] The deceleration section employs a centrifugal triggering mechanism consisting of a swing arm and a tension spring. The symmetrical layout of the two swing arms balances the force and prevents single-point failure. The swing arms are dynamically responsive, and their state is controlled by the rotational speed (centrifugal force). The symmetrical layout ensures balanced force and smooth power, preventing eccentric forces that could cause the mechanism to jam or experience abnormal wear.

[0016] At normal motor speed, the tension of the spring is sufficient to overcome the centrifugal force of the swing arm, keeping it in the retracted position and preventing interference with normal motor operation. When the motor veers off course and its speed abnormally increases, the centrifugal force exceeds the spring preload, causing the swing arm to swing out. The friction block generates significant friction with the inner side of the externally fixed motor brake seat, thus slowing the descent. Furthermore, the limiting lug provides a limiting space for the swing arm's movement, ensuring it swings out smoothly and quickly along the designed trajectory, rather than erratically, improving the accuracy of the action. Using a positioning shaft to mount the swing arm, with the limiting lug controlling its movement, not only greatly facilitates installation but also allows for controllable clearance between the swing arm and the positioning shaft. The limiting lug prevents excessive vibration at the rear end of the swing arm, and the double tension spring balances the swing arm, preventing excessive vertical movement that could cause breakage due to stress in the middle. The swing arm always remains within the limiting lug, opening and closing precisely.

[0017] All rotating components in this embodiment are symmetrically designed, ensuring dynamic balance, reducing vibration and noise during operation, and improving service life. Through the simple principles of levers, springs, and centrifugal force, the core safety and braking issues in the operation of roller shutter doors are solved efficiently and reliably.

[0018] The above embodiments are only used to further illustrate the brake disc structure of a roller shutter door motor of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A brake disc structure for a roller shutter door motor, characterized in that: It includes a disc body, two arched swing arms, and two tension springs. The back of the disc body is connected to a brake pad. The disc body has a bearing seat in the middle, and the bearing seat has a connecting shaft hole in the middle. The connecting shaft hole has a double flat structure. The front of the disc body has two axially protruding positioning shafts symmetrically arranged around its periphery. The two swing arms are symmetrically hinged to the positioning shafts. The corresponding ends of the two swing arms are respectively tightened by two tension springs. The outer end of the middle of each swing arm has a friction block that can cooperate with the motor brake seat. The bearing seat has two limiting lugs symmetrically arranged around its periphery. The limiting lugs limit the swing arms between the front of the disc body and the limiting lugs.

2. The brake disc structure of a roller shutter door motor according to claim 1, characterized in that: Two tension spring clearance spaces are provided between the back of the disc body and the swing arm.

3. The brake disc structure of a roller shutter door motor according to claim 2, characterized in that: The front of the disc body is symmetrically provided with two first support parts and two second support parts protruding along the axial direction. Two positioning shafts are respectively located on the two first support parts, and two second support parts are respectively located between the two first support parts. The side of each swing arm abuts against the corresponding first support part and second support part.

4. The brake disc structure of a roller shutter door motor according to claim 3, characterized in that: Each friction block is located between the corresponding first support and second support.

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