A compact intelligent door lock driving device

Abstract

The utility model discloses a compact structure's intelligent door lock drive arrangement, including drive part, transmission mechanism, output shaft, first plate seat and second plate seat, first plate seat and second plate seat parallel interval arrangement, and form the accommodation space for installing transmission mechanism between both, drive part coaxial attachment installation is in the second plate seat outside, and transmission mechanism includes the transmission gear set of engaging installation in the second plate seat inside, output shaft is connected with transmission gear set engaging through output shaft gear, and extends to first plate seat outside, the utility model discloses optimization transmission mechanism and mounting structure, make transmission gear set be multistage straight gear and form the transmission path of flattening between the plate seat, has reduced the axial dimension of gear box, first plate seat and second plate seat adopt the sheet metal structural member of continuous punch die stamping forming, further compressed thickness, and each gear is through reasonable design arrangement, limit compression overall space, satisfy the miniaturization requirement on intelligent door lock market.

Description

Technical Field

[0001] This utility model relates to the field of imaging equipment technology, and in particular to a compact intelligent door lock drive device. Background Technology

[0002] With the rapid development of smart home technology, smart door locks, as an important component of smart security systems, have been widely used in residences, office buildings, hotels, and other places. Smart door locks typically use a motor to drive an internal transmission mechanism that extends and retracts the bolt, thus opening and closing the door. The performance of the drive component directly affects the operational stability, response speed, and overall lifespan of the door lock, making it a crucial part of the smart door lock's structural design.

[0003] Existing smart locks mostly use motors and transmission mechanisms for drive, with the transmission mechanism positioned within the housing cavity. Due to limitations in mold precision and issues such as deformation and tolerance fluctuations during the molding process, the machining tolerance for the gear center distance is relatively large, affecting the return range of the transmission mechanism. This can lead to delays or free-spinning during lock opening and closing, difficulty in accurately controlling the bolt position, resulting in incomplete locking or retraction, thus affecting security performance. It can also cause problems such as high transmission noise and unstable operation. For high-precision electronic control systems, excessive return range can introduce feedback errors, leading to control delays. Furthermore, to ensure gear strength and lifespan, existing technologies generally use thicker gear designs, resulting in a larger overall size of the drive components, which is detrimental to the miniaturization of smart locks.

[0004] Therefore, how to reduce the transmission backlash angle, improve control response accuracy and structural compactness has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] Therefore, in order to solve the problems existing in the prior art, the purpose of this utility model is to provide a compact intelligent door lock drive device.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A compact intelligent door lock drive device includes a drive component, a transmission mechanism connected to the drive component, an output shaft driven by the transmission mechanism, and a first plate seat and a second plate seat for mounting the drive component, the transmission mechanism, and the output shaft. The first plate seat and the second plate seat are arranged parallel to each other and spaced apart, forming an accommodating space for mounting the transmission mechanism. The drive component is coaxially mounted on the outside of the second plate seat, and its output shaft passes through the second plate seat and is connected to the transmission mechanism. The transmission mechanism includes a transmission gear set meshing on the inside of the second plate seat. The output shaft is meshed with the transmission gear set through an output shaft gear and extends through to the outside of the first plate seat for driving the locking or unlocking action of the door lock.

[0008] The driving component is a brushless motor; the transmission gear set includes a first-order gear set, a second-order gear set, and a third-order gear set that are meshed together in sequence; the second plate base is respectively provided with gear positioning holes for positioning the gear shafts of the first-order gear set, the second-order gear set, and the third-order gear set; the brushless motor is connected to the first-order gear set through a motor gear; the third-order gear set is meshed with the output shaft gear; the output shaft of the brushless motor is arranged parallel to the axes of the gear shafts of the first-order gear set, the second-order gear set, the third-order gear set, and the output shaft gear.

[0009] The first plate base and the second plate base are provided with a plurality of limiting guide posts of equal length at intervals. The two ends of the limiting guide posts are respectively provided with mounting protrusions with an end diameter smaller than their main body. The first plate base and the second plate base are respectively provided with through holes with a diameter adapted to the mounting protrusions. The mounting protrusion at one end of the limiting guide post is inserted into the through hole of the second plate base, and the mounting protrusion at the other end is locked and fixed in the through hole of the first plate base by a locking member. The two end faces of the limiting guide post are respectively abutted against the inner surfaces of the first plate base and the second plate base.

[0010] The first-order gear set includes a first-order large gear and a first-order small gear arranged coaxially; the second-order gear set includes a second-order large gear and a second-order small gear arranged coaxially; the third-order gear set includes a third-order large gear and a third-order small gear arranged coaxially; the first-order large gear meshes with the motor gear; the first-order small gear meshes with the second-order large gear; the second-order small gear meshes with the third-order large gear; and the third-order small gear is connected to the output shaft gear.

[0011] To be further specified, the axis of the motor output shaft and the axis of the output shaft are located on the same horizontal straight line.

[0012] Furthermore, the motor gear, the first-order large gear, the first-order small gear, the second-order large gear, the second-order small gear, the third-order large gear, the third-order small gear, and the output shaft gear are all spur gears.

[0013] The outline shape of the main body of the first plate base and the second plate base is adapted to the shape of the motor so that the motor body is coaxially fitted between the two plate bases; one side edge of the first plate base and / or the second plate base is provided with an assembly part for mounting the door lock drive component to the door lock.

[0014] The first plate base has a shaft hole for mounting the output shaft. The output shaft gear is sleeved on one end of the output shaft near the first plate base. A mounting sleeve is sleeved on the output shaft. The outer diameter of the mounting sleeve matches the inner diameter of the shaft hole. The output shaft is installed through the mounting sleeve in the shaft hole.

[0015] Wherein, the end of the mounting bushing located inside the first plate seat has a limiting edge extending outward in the circumferential direction, and the diameter of the limiting edge is larger than the diameter of the shaft hole; the mounting bushing is limited in the shaft hole by the limiting edge abutting against the outer edge of the shaft hole, so as to prevent it from falling off to the outside of the first plate seat.

[0016] The first plate base and the second plate base are sheet metal structural parts formed by continuous stamping dies.

[0017] Furthermore, all gears are designed and manufactured to a precision level of 4 according to the JGMA-116-02 standard.

[0018] Compared with the prior art, the beneficial effects of this utility model are at least in the following aspects:

[0019] 1. This utility model optimizes the transmission mechanism and installation structure, making the transmission gear set a multi-stage spur gear with a flattened transmission path between the plate base. Through the reasonable staggered and coplanar arrangement of each stage of gears, a high-density transmission arrangement is achieved. While ensuring the transmission ratio and load-bearing capacity, the axial dimension of the gearbox is effectively reduced, improving space utilization. At the same time, due to the parallel and precise positioning of the gear axes, meshing stability and repeatability are improved, reducing the accumulation of transmission errors caused by assembly deviations.

[0020] Furthermore, the motor output shaft and power output shaft are aligned on the same horizontal line, and the main contours of the first and second mounting plates are adapted to the motor's shape, allowing the motor body to be coaxially fitted between the two mounting plates. Through a rational design and arrangement, the overall space is compressed to the extreme, meeting the miniaturization requirements of the smart door lock market.

[0021] 2. The first and second plate seats are sheet metal structural parts formed by continuous stamping dies. This one-time forming process achieves high repeatability and good dimensional stability. This not only further reduces the overall thickness of the gearbox, achieving an optimal balance between strength and compactness, but more importantly, the high dimensional consistency of the sheet metal parts, combined with positioning structures such as limiting guide pillars, precisely limits the installation position and center distance of the gear set. This keeps the cumulative return angle of the output shaft within the required range of ≤3°, meeting the stringent requirements of intelligent door locks for double-lock positioning and electronic control feedback accuracy.

[0022] 3. Compared to prior art that relies on die-cast aluminum or zinc alloy housings to position the gear center distance, this invention fundamentally reduces the manufacturing and assembly tolerance zone of the center distance by using high-precision sheet metal positioning components in conjunction with limiting guide pillars and a coaxial fit design of a brushless sensor motor. This reduces error accumulation, significantly lowers the output shaft backlash angle, and improves the consistency and yield of mass production. Simultaneously, combined with high-precision gear machining and tooth thickness optimization, it comprehensively improves transmission efficiency, static / dynamic noise levels, and service life, meeting the requirements of smart door locks for low noise, long lifespan, compact structure, and high control precision.

[0023] 4. This invention uses a brushless sensor motor as the driving component, achieving precise angle and speed control through electronic commutation and rotor position feedback. This overcomes the noise, lifespan reduction, and frequent maintenance problems associated with traditional brushed DC motors due to carbon brush wear. The brushless sensor motor offers higher energy efficiency, smoother starting and braking characteristics, and better low-speed controllability, meeting the demands of frequent opening and closing of smart door locks and their stringent requirements for positioning accuracy and response speed. This improves the overall lifespan of the device and enhances the user experience. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a compact intelligent door lock drive device according to a preferred embodiment of the present invention.

[0025] Figure 2 This is a partially exploded view of the overall structure of a compact intelligent door lock drive device according to a preferred embodiment of the present invention.

[0026] Figure 3 This is a top view of the overall structure of a compact intelligent door lock drive device according to a preferred embodiment of the present invention.

[0027] Figure 4 for Figure 3 Schematic diagram of the cross section in the AA direction;

[0028] Figure 5 This is an exploded view of the overall structure of a compact smart door lock drive device according to a preferred embodiment of the present invention.

[0029] Figure 6 A top view of the transmission mechanism and output shaft of a compact intelligent door lock drive device according to a preferred embodiment of this utility model.

[0030] Figure 7 This is a front view of the transmission mechanism and output shaft of a compact intelligent door lock drive device according to a preferred embodiment of the present invention, in their assembled state.

[0031] In the picture:

[0032] 1. Drive component; 11. Output shaft; 2. Transmission mechanism; 21. Transmission gear set; 211. First-order gear set; 2111. First-order large gear; 2112. First-order small gear; 212. Second-order gear set; 2121. Second-order large gear; 2122. Second-order small gear; 213. Third-order gear set; 2131. Third-order large gear; 2132. Third-order small gear; 22. Output shaft gear; 23. Motor gear; 3. Output shaft; 4. First plate base; 41. Assembly part; 42. Shaft hole; 5. Second plate base; 51. Gear positioning hole; 6. Limiting guide post; 61. Mounting protrusion; 7. Through hole; 8. Mounting bushing; 81. Limiting extension. Detailed Implementation

[0033] To facilitate understanding of this utility model, the technical solution and advantages of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific structure and features of this utility model are illustrated by way of example and should not constitute any limitation on this utility model. Furthermore, any of the technical features mentioned below (including implicit or disclosed features), as well as any technical features directly shown or implied in the figures, can be arbitrarily combined or deleted among these technical features to form other embodiments that may not be directly or indirectly mentioned in this utility model. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0034] In the description of this utility model, unless otherwise stated, all components used are conventional components in the prior art.

[0035] like Figure 1-7As shown, this utility model provides a compact intelligent door lock drive device, including a drive component 1, a transmission mechanism 2 connected to the drive component 1, an output shaft 3 driven by the transmission mechanism 2, and a first plate seat 4 and a second plate seat 5 for mounting the drive component 1, the transmission mechanism 2, and the output shaft 3; the first plate seat 4 and the second plate seat 5 are arranged parallel to each other and form an accommodating space for mounting the transmission mechanism 2; the drive component 1 is coaxially fitted to the outside of the second plate seat 5, and its output shaft 11 passes through the second plate seat 5 and is connected to the transmission mechanism 2; the transmission mechanism 2 includes a transmission gear set 21 meshing with the inside of the second plate seat 5; the output shaft 3 is meshed with the transmission gear set 21 through an output shaft gear 22 and extends through to the outside of the first plate seat 4 for driving the locking or unlocking action of the door lock.

[0036] This utility model's compact smart door lock drive device can be widely used in home smart door locks, office smart door locks, hotel smart door locks, etc. It features a small overall size, compact structure, high transmission efficiency, and low noise, meeting the technological demands of the smart door lock industry towards high precision, miniaturization, and long lifespan.

[0037] In this embodiment, the drive component 1 is a brushless motor; it achieves functions such as low noise, long life and low maintenance, high efficiency, precise control and good starting performance, thus improving the shortcomings of previous smart door locks that used DC motors.

[0038] The transmission gear set 21 includes a first-order gear set 211, a second-order gear set 212, and a third-order gear set 213 that are meshed together in sequence; the second plate base 5 is respectively provided with gear positioning holes 51 for positioning the gear shafts of the first-order gear set 211, the second-order gear set 212, and the third-order gear set 213; the brushless motor is connected to the first-order gear set 211 via a motor gear 23; the third-order gear set 213 is meshed with the output shaft gear 22; wherein, the first-order gear set 211 includes a first-order large gear 2111 and a first-order small gear 2111 arranged coaxially. 112; The second-order gear set 212 includes a second-order large gear 2121 and a second-order small gear 2122 arranged coaxially; The third-order gear set 213 includes a third-order large gear 2131 and a third-order small gear 2132 arranged coaxially; The first-order large gear 2111 meshes with the motor gear 23; The first-order small gear 2112 meshes with the second-order large gear 2121; The second-order small gear 2122 meshes with the third-order large gear 2131; The third-order small gear 2132 is connected to the output shaft gear 22 for transmission, thereby realizing multi-stage reduction transmission.

[0039] Furthermore, the motor gear 23, the first-order large gear 2111, the first-order small gear 2112, the second-order large gear 2121, the second-order small gear 2122, the third-order large gear 2131, the third-order small gear 2132, and the output shaft gear 22 are all spur gears. The spur gear structure facilitates high-precision tooth profile machining and position control, effectively ensuring the center distance accuracy and meshing stability between each gear set. In addition, each gear is designed and machined according to the JGMA-116-02 standard with a precision of grade 4. This significantly optimizes and improves the noise generated by gear meshing and the transmission efficiency.

[0040] In this embodiment, the first plate holder 4 and the second plate holder 5 are sheet metal structural parts stamped using a continuous stamping die. This ensures high dimensional accuracy and processing stability, achieves the functional requirement of a gearbox output shaft return angle ≤3°, and further enhances the precise control requirements of the smart door lock.

[0041] The output shaft 11 of the brushless motor is arranged parallel to the axes of the first-order gear set 211, the second-order gear set 212, the third-order gear set 213, and the output shaft gear 22. In this embodiment, to ensure structural compactness and transmission accuracy, the axes of the brushless motor output shaft, the gear shafts of each gear set, and the output shaft are all arranged in parallel, forming a linear planar transmission structure on the same plane. By rationally arranging the gear center distance and gear module, the overall transmission chain length is shortened, and the thickness of the gearbox is reduced, meeting the product requirements of smart door locks towards thinner and lighter designs.

[0042] Optionally, the axis of the motor output shaft 11 and the axis of the output shaft 3 are located on the same horizontal straight line. In this embodiment, by arranging the motor output shaft and the output shaft geometrically collinear, the force distribution of each stage of gear transmission can be more balanced, avoiding uneven force distribution in gear meshing caused by the offset of the transmission path, thereby improving meshing stability and lifespan; at the same time, it is beneficial to further reduce the overall thickness of the mechanism, improve assembly compactness and space utilization.

[0043] Optionally, a plurality of equal-length limiting guide posts 6 are spaced apart between the first plate base 4 and the second plate base 5. Each end of the limiting guide post 6 extends with a mounting protrusion 61 having a diameter smaller than its main body. The first plate base 4 and the second plate base 5 each have a through hole 7 with a diameter matching the mounting protrusion 61. One end of the mounting protrusion 61 of the limiting guide post 6 is inserted into the through hole 7 of the second plate base 5, while the other end is locked and fixed in the through hole 7 of the first plate base 4 by a locking member. The two end faces of the limiting guide post 6 abut against the inner surfaces of the first plate base 4 and the second plate base 5, respectively. In this embodiment, the cooperative design of the limiting guide post and the mounting protrusion not only improves the ease of assembly but also further reduces the overall assembly space and improves the compactness of the structure. Compared with traditional technologies that rely on multiple connectors or complex assembly processes, this solution simplifies the installation steps, reduces production costs, and improves production efficiency while ensuring transmission accuracy.

[0044] In this embodiment, the main body contours of the first plate base 4 and the second plate base 5 are adapted to the shape of the motor, so that the motor body can be coaxially fitted between the two plate bases. One edge of the first plate base 4 and / or the second plate base 5 is provided with an assembly part 41 for mounting the door lock drive component 1 to the door lock. By designing the main body contours of the first and second plate bases to match the shape of the motor, the motor body can be coaxially fitted between the two plate bases, thereby improving the assembly accuracy and structural stability between the drive mechanism and the transmission mechanism. This design reduces the assembly gap between the motor and the plate base, contributing to the reduction of overall thickness and improved structural compactness.

[0045] Furthermore, the mounting portions provided on the side edges of the first plate base and / or the second plate base facilitate the installation of the drive component onto the door lock body, thereby achieving modular assembly of the drive mechanism. It should be noted that the mounting portions are merely conventional installation structures and are not the focus of this application's improvement; their purpose is to facilitate the integration of the drive mechanism as a whole with the door lock body.

[0046] Optionally, the first plate base 4 is provided with a shaft hole 42 for mounting the output shaft 3. The output shaft gear 22 is sleeved on the end of the output shaft 3 near the first plate base 4. A mounting sleeve 8 is sleeved on the output shaft 3. The outer diameter of the mounting sleeve 8 matches the inner diameter of the shaft hole 42. The output shaft 3 is installed through the mounting sleeve 8 in the shaft hole 42. With the above structure, the output shaft can achieve smooth and precise rotational support through the mounting sleeve, effectively reducing the radial wobble and assembly deviation of the output shaft, and improving the coaxiality and rotational accuracy during transmission.

[0047] In a more detailed manner, the mounting bushing 8 has a limiting edge 81 extending outward in the circumferential direction at one end located inside the first plate seat 4. The diameter of the limiting edge 81 is larger than the diameter of the shaft hole 42. The limiting edge 81 abuts against the outer edge of the shaft hole 42, thus limiting the mounting bushing 8 in the shaft hole 42 to prevent it from falling off to the outside of the first plate seat 4, thereby ensuring the installation stability and rotational reliability of the output shaft 3.

[0048] This invention optimizes the transmission mechanism and mounting structure, resulting in a multi-stage spur gear set forming a flattened transmission path between the plates. Through the rational staggered and coplanar arrangement of each gear stage, a high-density transmission chain arrangement is achieved. While ensuring the transmission ratio and load-bearing capacity, the axial dimension of the gearbox is effectively reduced, improving space utilization. Simultaneously, due to the parallel and precise positioning of the gear axes, meshing stability and repeatability are improved, reducing the accumulation of transmission errors caused by assembly deviations. The rational design and arrangement of each gear maximizes the compression of the overall space, meeting the miniaturization requirements of the smart door lock market.

[0049] It should be noted that this utility model also includes other components and elements for realizing the intelligent door lock drive function, such as the main control system, power management module, signal transmission line and related sensing elements for drive control. These parts can be configured according to the design requirements of the specific door lock system and are not the focus of this utility model improvement, so they will not be described in detail here.

[0050] The above embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. For those skilled in the art, it will be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A compact intelligent door lock drive device, characterized in that, The device includes a drive component, a transmission mechanism connected to the drive component, an output shaft driven by the transmission mechanism, and a first plate and a second plate for mounting the drive component, the transmission mechanism, and the output shaft. The first plate and the second plate are arranged parallel to each other and spaced apart, forming an accommodating space for mounting the transmission mechanism. The drive component is coaxially fitted to the outside of the second plate, and its output shaft passes through the second plate and is connected to the transmission mechanism. The transmission mechanism includes a transmission gear set meshing with the inside of the second plate. The output shaft is meshed with the transmission gear set through an output shaft gear and extends through to the outside of the first plate for driving the locking or unlocking action of the door lock.

2. The compact intelligent door lock drive device as described in claim 1, characterized in that, The driving component is a brushless motor; the transmission gear set includes a first-order gear set, a second-order gear set, and a third-order gear set that are meshed together in sequence; the second plate base is respectively provided with gear positioning holes for positioning the gear shafts of the first-order gear set, the second-order gear set, and the third-order gear set; the brushless motor is connected to the first-order gear set through a motor gear; the third-order gear set is meshed with the output shaft gear; the output shaft of the brushless motor is arranged parallel to the axes of the gear shafts of the first-order gear set, the second-order gear set, the third-order gear set, and the output shaft gear.

3. The compact intelligent door lock drive device as described in claim 2, characterized in that, A plurality of equal-length limiting guide posts are provided between the first plate base and the second plate base. Each end of the limiting guide post extends with a mounting protrusion whose end diameter is smaller than its main body. The first plate base and the second plate base are respectively provided with through holes with corresponding diameters to the mounting protrusions. The mounting protrusion at one end of the limiting guide post is inserted into the through hole of the second plate base, and the mounting protrusion at the other end is locked and fixed in the through hole of the first plate base by a locking member. The two end faces of the limiting guide post are respectively abutted against the inner surfaces of the first plate base and the second plate base.

4. The compact intelligent door lock drive device as described in claim 3, characterized in that, The first-order gear set includes a first-order large gear and a first-order small gear arranged coaxially; the second-order gear set includes a second-order large gear and a second-order small gear arranged coaxially; the third-order gear set includes a third-order large gear and a third-order small gear arranged coaxially; the first-order large gear meshes with the motor gear; the first-order small gear meshes with the second-order large gear; the second-order small gear meshes with the third-order large gear; and the third-order small gear is connected to the output shaft gear.

5. The compact intelligent door lock drive device as described in claim 4, characterized in that, The outline shape of the main body of the first plate base and the second plate base is adapted to the shape of the motor so that the motor body is coaxially fitted between the two plate bases; one side edge of the first plate base and / or the second plate base is provided with an assembly part for mounting the door lock drive to the door lock.

6. The compact intelligent door lock drive device as described in claim 4, characterized in that, The first plate base is provided with a shaft hole for mounting the output shaft. The output shaft gear is sleeved on one end of the output shaft near the first plate base. A mounting sleeve is sleeved on the output shaft. The outer diameter of the mounting sleeve matches the inner diameter of the shaft hole. The output shaft is installed through the mounting sleeve in the shaft hole.

7. The compact intelligent door lock drive device as described in claim 6, characterized in that, The mounting bushing has a limiting edge extending outward in the circumferential direction at one end located inside the first plate seat. The diameter of the limiting edge is larger than the diameter of the shaft hole. The mounting bushing is confined in the shaft hole by the limiting edge abutting against the outer edge of the shaft hole to prevent it from falling off to the outside of the first plate seat.

8. The compact intelligent door lock drive device as described in claim 7, characterized in that, The axis of the motor output shaft and the axis of the output shaft are located on the same horizontal straight line.

9. The compact intelligent door lock drive device as described in claim 4, characterized in that, The motor gear, first-order large gear, first-order small gear, second-order large gear, second-order small gear, third-order large gear, third-order small gear, and output shaft gear are all spur gears.

10. The compact intelligent door lock drive device as described in claim 1, characterized in that, The first plate base and the second plate base are sheet metal structural parts formed by continuous stamping dies.

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