An electric pulley structure

Abstract

The utility model discloses a kind of electric pulley structures, it is related to electric pulley technical field, solve the problem that existing electric pulley structure is complex, cannot control movement under the condition of power failure. The utility model includes support shell, motor is fixedly arranged on support shell, the output end of motor is equipped with worm gear drive mechanism, and it is driven by worm gear drive mechanism and input gear, input gear and clutch gear assembly transmission cooperation, clutch gear assembly and output gear cooperation, output gear and driving wheel transmission cooperation. Clutch gear assembly includes first gear, second gear and crank that are coaxially arranged in sequence, first gear and second gear are fixedly connected between, the meshing gear that is engaged with second gear is equipped at both ends of crank, and the coaxial rotation of crank relative to second gear makes one of meshing gear cooperate with output gear. Set clutch gear assembly can automatically separate between motor and driving wheel when power failure or manual operation, improve the reliability and security of use.

Description

Technical Field

[0001] This utility model relates to the field of electric pulley technology, and in particular to an electric pulley structure. Background Technology

[0002] With the rapid development of smart homes and building automation, the demand for electrified sliding doors and windows is increasing. Traditional sliding doors and windows generally rely on manual operation, which suffers from low levels of intelligence, high operating force, and inability to precisely control the opening angle, making it difficult to meet modern users' needs for convenience, comfort, and safety. To address this, the industry has begun to integrate micro motors, gear reduction mechanisms, and pulley systems to form "electric pulley" modules that can be hidden inside the window frame profiles. These modules use motors to drive the automatic sliding of doors and windows and can be precisely started and stopped in conjunction with a control system.

[0003] However, existing electric pulleys still exhibit the following shortcomings in practical applications: When power is lost or the system malfunctions, the motor output shaft is locked by the gear set, preventing the pulley from rolling and causing doors and windows to "jam." Users must disassemble the profiles or damage the transmission components to manually open and close them, resulting in a poor user experience and high maintenance costs. To achieve manual and electric switching, some solutions employ electromagnetic clutches or complex shift fork mechanisms, which have numerous parts and large axial dimensions, making them difficult to adapt to the installation space of narrow profiles. Furthermore, they require continuous power to maintain the clutch engagement state, failing upon power failure and exhibiting insufficient reliability.

[0004] The invention patent application with publication number CN111706205A proposes an integrated clutch solution of "lifting rack-sloping block-energy storage elastic element", which realizes the lifting and rotation of the lower pulley driven by a single motor. However, its clutch action relies on the self-locking of the inclined plane and the energy storage of the elastic element. The structure is complex, the parts processing precision requirements are high, and the unlocking process requires an additional electromagnetic push rod. There is also a risk of not being able to unlock when the power is off, and it fails to completely solve the industry pain point of "power failure jamming".

[0005] Therefore, how to provide an electric pulley structure that is simple in structure, can be manually operated when power is off, has reliable electric / manual switching, and has precise transmission positioning without adding an extra power source, increasing the size and complexity of the mechanism has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0006] To address the shortcomings of the aforementioned background technology, this utility model proposes an electric pulley structure, which solves the problems of complex electric pulley structures and inability to be controlled and moved in the event of a power outage.

[0007] The technical solution of this utility model is implemented as follows: An electric pulley structure includes a support shell, on which a motor is fixedly mounted. The output end of the motor is equipped with a worm gear transmission mechanism, which engages with an input gear. The input gear engages with a clutch gear assembly, which engages with an output gear. The output gear engages with a drive wheel. The clutch gear assembly includes a first gear, a second gear, and a crank arranged coaxially in sequence. The first and second gears are fixedly connected. Both ends of the crank are provided with meshing gears that mesh with the second gear. The crank can rotate coaxially relative to the second gear, causing one of the meshing gears to engage with the output gear.

[0008] Preferably, the worm gear transmission mechanism includes a worm coaxially fixed at the output end of the motor, the worm meshing with a worm wheel rotatably mounted on a support housing, and a transmission gear I coaxially fixed on one side of the worm wheel, the transmission gear I meshing with an input gear. Both the input gear and the output gear are two-stage gears.

[0009] Preferably, the support shell is provided with a rotatable axle I, a drive wheel is snapped or fixedly mounted on the axle I, a gear disk is snapped or fixedly mounted on the axle I, the gear disk meshes with a transmission gear II rotatably mounted on the support shell, and the transmission gear II is in transmission engagement with the output gear.

[0010] Preferably, the support shell is provided with a rotatable axle II, and a driven wheel is engaged or fixed on the axle II. The axle I is a shaft with a D-shaped cross-section, and through holes with D-shaped cross-sections are correspondingly opened at the axes of the drive wheel and the gear disc. Both the drive wheel and the driven wheel have annular grooves on their surfaces. Both the drive wheel and the driven wheel are rubber wheels.

[0011] Preferably, the transmission ratio between adjacent gears along the direction from the input gear to the output gear is greater than one. The sum of the distances from the axis of the meshing gear to the axis of the second gear and the distances to the axis of the output gear is greater than the distance from the axis of the second gear to the axis of the output gear.

[0012] The beneficial effects of this utility model are: This invention integrates key components such as a motor, worm gear transmission mechanism, clutch gear assembly, and drive wheel into a single unit, forming a compact and highly efficient electric pulley structure. By incorporating a clutch gear assembly, a rotatable crank supports the meshing gears, enabling bidirectional switching between manual and electric operation. In the event of a power outage or manual operation, the transmission between the motor and drive wheel disengages, allowing the drive wheel to freely rotate, ensuring easy manual pushing and pulling. This effectively solves the problem of existing electric pulleys easily locking up during power outages or malfunctions, improving reliability and safety. Furthermore, it eliminates the need for conventional structures such as electromagnetic clutches, shift forks, or dual motors, reducing manufacturing costs and installation difficulty. The transmission system employs a multi-stage gear design, efficiently amplifying the motor's output torque to provide ample power for sliding doors and windows, while ensuring smoothness and precision during opening and closing. In addition, the overall structural design is reasonable, facilitating installation and modification within existing sliding door and window systems, exhibiting good versatility and practicality, and meeting the needs of automated door and window control in smart home systems. Attached Figure Description

[0013] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a top view of the structure of this utility model; Figure 3 This is a schematic diagram of the exploded structure of this utility model; Figure 4 This is a schematic diagram of the internal structure of the support shell of this utility model; In the diagram: 1: Support housing, 2: Motor, 3: Input gear, 4: Clutch gear assembly, 41: First gear, 42: Second gear, 43: Crank, 44: Meshing gear, 5: Output gear, 6: Drive wheel, 7: Worm gear transmission mechanism, 71: Worm, 72: Worm gear, 81: Transmission gear I, 82: Transmission gear II, 11: Wheel and axle I, 12: Gear disc, 13: Wheel and axle II, 14: Driven wheel, 15: Annular groove. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figure 1 , 2 As shown in Figure 4, in Embodiment 1, an electric pulley structure includes a support shell 1, on which a motor 2 is fixedly mounted. The motor 2 is a brushless DC motor. The output end of the motor 2 is equipped with a worm gear transmission mechanism, which engages with an input gear 3 to form a first-stage reduction, thus transmitting the output power of the motor 2. The input gear 3 engages with a clutch gear assembly 4, which in turn engages with an output gear 5. The output gear 5 then engages with a drive wheel 6.

[0017] The clutch gear assembly 4 includes a first gear 41, a second gear 42, and a crank 43 arranged coaxially in sequence. The first gear 41 and the second gear 42 are fixedly connected. Both ends of the crank 43 are provided with meshing gears 44 that mesh with the second gear 42. The crank 43 can rotate coaxially relative to the second gear 42, allowing one of the meshing gears 44 to engage with the output gear 5. In this embodiment, the first gear 41 and the second gear 42 are integrally formed or fixed by welding. Through holes are provided at their axes, and they are rotatably mounted on the short shaft of the support shell 1, thus enabling rotation. At the same time, the crank 43 has a through hole in the middle, which is used to mount the crank on the short shaft, thereby enabling the crank 43 to rotate relative to the second gear 42 and the first gear 41. During rotation, the meshing gears at both ends of the crank maintain meshing with the second gear 42. This utility model integrates key components such as the motor, worm gear transmission mechanism, clutch gear assembly, and drive wheel into one unit, forming a compact and efficient electric pulley structure.

[0018] Specifically, in this embodiment, the worm gear transmission mechanism includes a worm 71 coaxially fixed to the output end of the motor 2. The worm 71 meshes with a worm wheel 72 rotatably mounted on the support housing 1. A transmission gear I 81 is coaxially fixed to one side of the worm wheel 72, and the transmission gear I 81 meshes with the input gear 3. In this embodiment, both the input gear 3 and the output gear 5 are two-stage gears, both rotatably mounted on a short shaft on the support housing to achieve power transmission.

[0019] When the motor is powered on, the torque output from the motor's output end is transmitted to the output gear 5 via a sequentially connected worm gear, worm shaft, transmission gear I81, input gear 3, first gear 41, second gear 42, and meshing gear 44 on the crank. The output gear 5 then drives the drive wheel 6 to rotate, automatically opening the doors and windows. When it is necessary to close the doors and windows, the motor reverses, causing the first and second gears to reverse as well. The friction between the second gear and the crank rotates the crank, causing the meshing gear that was originally engaged with the output gear to automatically disengage and move with the crank until the other meshing gear engages with the output gear, maintaining transmission capability and ultimately achieving the goal of reversing the drive wheel. When a power outage or system malfunction requires manual pushing or pulling of doors and windows, the drive wheel 6 rotates in the opposite direction due to track friction. The manual pushing force is transmitted sequentially from the drive wheel 6 in the opposite direction, causing the output gear 5 to reverse. The output gear 5 pushes away the meshing gear 44, disengaging the transmission. The meshing gear is in a free state and does not transmit load, allowing the drive wheel 6 to roll freely, achieving smooth manual operation and providing clutch protection for the motor end. By setting up a clutch gear assembly, the clutch structure using a rotatable crank to support the meshing gear achieves bidirectional switching between manual and electric operation. In the event of a power outage or manual operation, the transmission between the motor and the drive wheel is disengaged, and the drive wheel enters a free-spinning state, ensuring easy manual pushing and pulling by the user. This effectively solves the problem of existing electric pulleys easily locking up during power outages or malfunctions, improving reliability and safety. Example 2, as Figure 3 As shown, an electric pulley structure, based on embodiment 1, includes a rotatable axle I11 on the support shell 1. A drive wheel 6 is engaged or fixedly mounted on the axle I11. A gear disc 12 is engaged or fixedly mounted on the axle I11. The gear disc 12 meshes with a transmission gear II82 rotatably mounted on the support shell 1. The transmission gear II82 is in transmission engagement with an output gear 5. Additionally, a rotatable axle II13 is provided on the support shell 1, and a driven wheel 14 is engaged or fixedly mounted on the axle II13 to ensure smooth movement of doors and windows.

[0020] Specifically, in this embodiment, the axle I11 is a shaft with a D-shaped cross-section. Bearings are fixed at both ends of the axle I11 and connected to the support shells on both sides through the bearings to satisfy the rotation and installation of the axle I. D-shaped cross-section through holes are opened at the axis of the drive wheel 6 and the gear disk 12 respectively. The axle I passes through the D-shaped cross-section through holes, thereby realizing the torque transmission between the drive wheel 6 and the gear disk 12.

[0021] As a further implementation, annular grooves 15 are provided on the surfaces of both the drive wheel 6 and the driven wheel 14 for engaging with the lower rail. Alternatively, both the drive wheel 6 and the driven wheel 14 can be rubber wheels. Using rubber wheels improves noise reduction and operational smoothness. Alternatively, the main bodies of the drive wheel 6 and the driven wheel 14 can be designed as metal wheels, with a rubber layer only applied through a vulcanization process at the annular grooves to further improve noise reduction and operational smoothness.

[0022] Example 3 presents an electric pulley structure. Based on Example 2, the transmission ratio between adjacent gears along the direction from input gear 3 to output gear 5 is greater than one, thereby achieving speed reduction. This example, through a multi-stage gear reduction transmission design, efficiently amplifies the motor's output torque, providing sufficient power support for sliding doors and windows while ensuring smoothness and precision during opening and closing. In practical design, the transmission ratio between adjacent gears along the direction from input gear 3 to output gear 5 is further adjusted to meet the opening and closing force requirements of doors and windows of different weights.

[0023] In addition, in this embodiment, the sum of the distances from the axis of the meshing gear 44 to the axis of the second gear 42 and the distances to the axis of the output gear 5 is greater than the distance from the axis of the second gear 42 to the axis of the output gear 5. This is used to limit the swing angle of the crank 43 and prevent the meshing gear from entering and passing between the second gear and the output gear, which would lead to meshing failure.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electric pulley structure, characterized in that: Includes a support shell (1), on which a motor (2) is fixedly mounted. The output end of the motor (2) is provided with a worm gear transmission mechanism, which is connected to the input gear (3) through the worm gear transmission mechanism. The input gear (3) is connected to the clutch gear assembly (4) through transmission. The clutch gear assembly (4) is connected to the output gear (5) through transmission. The output gear (5) is connected to the drive wheel (6) through transmission. The clutch gear assembly (4) includes a first gear (41), a second gear (42) and a crank (43) arranged coaxially in sequence. The first gear (41) and the second gear (42) are fixedly connected. Both ends of the crank (43) are provided with meshing gears (44) that mesh with the second gear (42). The crank (43) can rotate coaxially relative to the second gear (42) so that one of the meshing gears (44) engages with the output gear (5).

2. The electric pulley structure according to claim 1, characterized in that: The worm gear transmission mechanism includes a worm (71) coaxially fixed at the output end of the motor (2), the worm (71) meshing with a worm wheel (72) rotatably mounted on the support shell (1), and a transmission gear I (81) coaxially fixed on one side of the worm wheel (72), which meshes with the input gear (3).

3. The electric pulley structure according to claim 2, characterized in that: Both the input gear (3) and the output gear (5) are two-stage gears.

4. The electric pulley structure according to claim 3, characterized in that: The support shell (1) is provided with a rotatable axle I (11), the drive wheel (6) is snapped or fixed on the axle I (11), the axle I (11) is snapped or fixed with a gear disk (12), the gear disk (12) meshes with the transmission gear II (82) rotatably set on the support shell (1), and the transmission gear II (82) is in transmission cooperation with the output gear (5).

5. The electric pulley structure according to claim 4, characterized in that: The support shell (1) is provided with a rotatable axle II (13), and a driven wheel (14) is snapped or fixed on the axle II (13).

6. The electric pulley structure according to claim 5, characterized in that: The axle I (11) is a shaft with a D-shaped cross section, and through holes with a D-shaped cross section are opened at the axis of the drive wheel (6) and the gear disk (12).

7. The electric pulley structure according to claim 6, characterized in that: Both the drive wheel (6) and the driven wheel (14) have annular grooves (15) on their surfaces.

8. The electric pulley structure according to claim 7, characterized in that: Both the drive wheel (6) and the driven wheel (14) are rubber wheels.

9. The electric pulley structure according to any one of claims 1 to 8, characterized in that: The transmission ratio between adjacent gears along the direction from the input gear (3) to the output gear (5) is greater than one.

10. The electric pulley structure according to claim 9, characterized in that: The sum of the distances from the axis of the meshing gear (44) to the axis of the second gear (42) and the distances to the axis of the output gear (5) is greater than the distance from the axis of the second gear (42) to the axis of the output gear (5).

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