Clutch transmission for intelligent door lock

Abstract

The clutch transmission device of the intelligent door lock comprises a shell, a gear box, an elastic clutch part, a core shaft and a handle; wherein the shell comprises a front end cover and a rear end cover, the front through hole of the front end cover and the rear through hole of the rear end cover are located on the same axis line; the core shaft is arranged in the front through hole of the front end cover and is used for connecting the lock core of the intelligent door lock; the gear box is arranged in the rear through hole of the rear end cover and can transmit the torque generated by the motor to the core shaft; the elastic clutch part is located at the front end of the gear box and can separate the core shaft and the transmission part on the gear box; the handle is located at the rear end of the gear box and can engage the transmission part of the gear box and the core shaft. The application has the advantages that the electric and manual clutch transmission device is integrated and built-in in the door handle, the installation of the non-destructive clutch can be realized, and the universality is high.

Description

Technical Field

[0001] This invention relates to the field of door lock control technology, and more specifically to the clutch of a smart door lock. Background Technology

[0002] Door handles are an important component of door locks. By controlling the door handle to rotate the door lock's transmission components, the door can be opened. In current technology, the handle of an electronic door lock is simply a component that transmits the force of the user to twist and unlock. Generally, these handles are solid. Even if the handle is hollow, the internal space is very limited. Therefore, the complex clutch control mechanism and electronic components of electronic door locks are usually designed into the lock body rather than in the handle. Because the lock body has ample space to accommodate all the detection and automated control mechanisms, this type of lock body structure is generally large, expensive, and inconvenient to install and maintain.

[0003] We know that the clutch control mechanisms of electronic door locks on the market currently fall into two categories. One type has the clutch on the electronic lock panel, controlling the disengagement and engagement of the handle and the square bar. When the clutch is engaged, the square bar transmits rotation from the handle to the lock body, enabling the door to open. The advantage of this type of lock is that the lock body is a purely mechanical component, resulting in higher reliability and lower cost. However, it also presents significant compatibility issues. Currently, there are many types of mechanical lock bodies on the market, and there is no standardized size or specification for the square bar position. More problematic is that some mechanical lock bodies can only open one latch at the external square bar connection hole, failing to meet the electronic lock's requirement to open all latches. Therefore, when installing this type of electronic lock, the original lock body on the door needs to be removed and replaced with a compatible mechanical lock body to ensure the electronic lock functions properly. Another type integrates the clutch into the lock body. The door handle connects to a square rod hole on the lock body inside the door via a square rod. After authentication, the electronic module controls the clutch inside the lock body to connect and close the square rod hole with the lock body's actuator. This allows the square rod to convert the force on the handle into force to control the bolt, thus opening the door. This type of electronic lock with the clutch inside the lock body requires replacing the mechanical lock body on the door during installation, similar to the first type of electronic lock, involving lock body disassembly. Because the new lock body's opening on the door may differ from the original lock body's, a new opening needs to be drilled on the door. Even worse, the position and size of the bolt insertion hole on the door frame also need to be adjusted according to the different lock bodies. This installation method damages the original structure of the door and door frame, a practice known in the industry as "destructive" installation. It directly damages the user's original door and door frame, and installer errors can lead to the replacement of the door and door frame, causing significant inconvenience to the user. What's more troublesome is that since different electronic lock manufacturers use different lock bodies, the door and door frame are likely to be damaged again when users replace their electronic locks with those from other manufacturers.

[0004] Chinese Patent Publication No. CN106223731A, entitled "A Direct Drive Transmission Device for a Door Lock Motor," discloses a direct drive transmission device for a door lock motor, comprising a lock cylinder, a lever, an unlocking knob, drive bevel gears, a geared motor, motor bevel gears, a photoelectric switch, a grating encoder disk, an inner door panel, a base plate, a buffer pad, and a locking cover. The drive bevel gears mesh with the motor bevel gears, and the geared motor connects to the motor bevel gears via its power output end. Specifically, the motor bevel gears and the drive bevel gears are a pair of meshing bevel gears. The geared motor transmits power torque to the motor bevel gears through its power output end. The meshing of the motor bevel gears with the drive bevel gears transmits power to the lever through the buffer pad inside the drive bevel gears. The lever rotates, thereby driving the lock cylinder and the unlocking knob to rotate, achieving automatic locking or unlocking. The unlocking knob is located on the inner door panel, which is installed during installation. Installed on the inside of the door; the drive bevel gear, reduction motor, motor bevel gear, photoelectric switch, grating encoder disk, buffer pad, and locking cover are set on the base plate, and the buffer pad is tightly engaged with the drive bevel gear; the grating encoder disk is set between the end face of the reduction motor and the motor bevel gear, and the notch of the photoelectric switch cooperates with the grating encoder disk; when the reduction motor moves, its power output end drives the grating encoder disk to rotate, and the photoelectric switch is used to detect the rotation signal of the grating encoder disk; the buffer pad is set inside the drive bevel gear, and the protruding part of the drive bevel gear passes through the round hole of the base plate and is fixedly connected to the locking cover; the lever passes through the inner panel of the door, and sequentially passes through the drive bevel gear, the base plate, the lock cylinder, the buffer pad, and the locking cover. Specifically, the lever passes through the center of the drive bevel gear, with one end connected to the unlocking knob and the other end connected to the lock cylinder. However, this solution has the following disadvantages: 1. The motor direct drive transmission device is installed in the lock body, and the lock body must be disassembled during installation and maintenance, which is costly. 2. The handle of this patent is a purely torque-driven component.

[0005] In summary, on the one hand, how to achieve non-destructive installation will be a crucial issue for the aftermarket electronic lock market. On the other hand, in order to reduce the cost and size of electronic door locks while still enabling electronic unlocking, technicians are exploring whether all electronic control functions of the door lock can be implemented within the rear handle, and the clutch drive mechanism located within the rear handle is a key component. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a clutch transmission device for a smart door lock. This clutch transmission device integrates electric and manual clutches into the handle, which has a high degree of integration, strong versatility, and can achieve non-destructive clutch installation.

[0007] The technical solution of the present invention is achieved in the following ways:

[0008] This invention discloses a clutch transmission device for a smart door lock, comprising: a housing, a gearbox, an elastic clutch element, a spindle, and a handle; wherein, the housing includes a front cover and a rear cover, the front through hole of the front cover and the rear through hole of the rear cover are located on the same axis; the spindle passes through the front through hole of the front cover and is used to connect the lock cylinder of the smart door lock; the gearbox passes through the rear through hole of the rear cover and is capable of transmitting the torque generated by the motor to the spindle; the elastic clutch element is located at the front end of the gearbox and is capable of separating the spindle from the transmission component on the gearbox; the handle is located at the rear end of the gearbox and is capable of engaging the transmission component of the gearbox and the spindle.

[0009] As a further limitation of the present invention, a torsion spring is provided between the rear end cover and the gearbox for rotational connection between the two; a bushing is provided between the front through hole of the front end cover and the spindle, and the spindle can rotate relative to the housing.

[0010] As a further limitation of the present invention, the output shaft section of the mandrel is located outside the front end cover of the housing, and a square hole is provided at its distal end along the axial direction of the mandrel for inserting a square rod; the input shaft section of the mandrel is located inside the front end cover of the housing for receiving the torque output by the gearbox; the driven grinding disc of the mandrel is provided at the connection between the output shaft section and the input shaft section for meshing the transmission component of the gearbox and the mandrel; wherein, the outer diameter of the driven grinding disc is larger than the outer diameter of the input shaft section and the outer diameter of the output shaft section.

[0011] As a further limitation of the present invention, on the rotating part of the gearbox, an annular ring is provided extending outward along the axis of the rotating part, and the inner ring of the annular ring has internal teeth extending radially inward; on the input shaft section of the spindle, external teeth are provided extending radially outward; both the external teeth and the internal teeth are provided in pairs, and are distributed circumferentially at intervals.

[0012] As a further limitation of the present invention, the external teeth of the mandrel are inserted into the annular ring of the rotating member to form a pivot mechanism, and the preset rotational stroke of the rotating member of the gearbox is greater than the unlocking rotational stroke of the mandrel.

[0013] As a further limitation of the present invention, a bearing is provided between the inner ring of the transmission component and the outer ring of the rotating component of the gearbox for rotatable connection between the transmission component and the rotating component.

[0014] As a further limitation of the present invention, the outer and inner diameters of the active grinding disc of the transmission component are substantially the same as the outer and inner diameters of the driven grinding disc of the mandrel, which facilitates the complete meshing of the active and driven grinding discs.

[0015] As a further limitation of the present invention, the elastic clutch is an elastic wave ring, the outer diameter of the elastic wave ring is basically the same as the outer diameter of the transmission component, and the inner diameter of the elastic wave ring is slightly larger than the outer diameter of the active grinding disc.

[0016] As a further limitation of the present invention, the centerlines of the gearbox, the elastic clutch, the spindle, and the handle are located on the same axis.

[0017] As a further limitation of the present invention, the elastic wave coil, the driving grinding disc of the transmission component, and the driven grinding disc of the spindle constitute a manual clutch mechanism for manually unlocking the smart door lock.

[0018] The beneficial effects of this invention are:

[0019] The clutch transmission device of the smart door lock of the present invention adopts a pivotal mechanism formed by the rotating part of the gearbox and the spindle to transmit the torque of the gearbox to the lock cylinder for unlocking or locking the smart door lock; it also adopts the rotation of the handle to drive the axial movement of the gearbox, so that the transmission part of the gearbox and the spindle mesh, realizing the manual unlocking of the smart door lock; the present invention integrates the manual and electric clutch transmission mechanisms into the door handle, with a high degree of integration, and can realize the installation of the clutch door handle without damage, thus having good versatility. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is one of the exploded structural diagrams of the clutch transmission device of the smart door lock according to an embodiment of the present invention;

[0022] Figure 2 This is the second exploded structural diagram of the clutch transmission device of the smart door lock according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the overall structure of the clutch transmission device of the smart door lock according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the gearbox structure of the clutch transmission device of the smart door lock according to an embodiment of the present invention;

[0025] Figure 5 This is an exploded structural diagram of the gearbox of the clutch transmission device of the smart door lock according to an embodiment of the present invention;

[0026] Figure 6This is a schematic diagram of the rotating component of the gearbox in the clutch transmission device of the smart door lock according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the transmission component of the gearbox in the clutch transmission device of the smart door lock according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the spindle structure of the clutch transmission device of the smart door lock according to an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the spindle of the clutch transmission device of the smart door lock according to another perspective of the present invention;

[0030] Figure 10 This is a schematic diagram of the manual unlocking structure of the clutch transmission device of the smart door lock according to an embodiment of the present invention, consisting of a gearbox, an elastic wave coil, and a spindle.

[0031] Figure 11 This is a schematic diagram of the gearbox and spindle structure of the clutch transmission device of the smart door lock according to an embodiment of the present invention;

[0032] Figures 12a-12e This is a schematic diagram of the working state of the pivot mechanism consisting of the spindle and rotating parts of the smart door lock according to an embodiment of the present invention.

[0033] Reference numerals: Housing 1; Front cover 11; Front through hole 111; Rear cover 12; Rear through hole 121; Gearbox 2; Motor 21; Transmission component 22; Driven grinding disc 221; Force-receiving part 222; Locking block 223; Countersunk screw hole 224; Rotating component 23; Ring 231; Internal gear 232; Central shaft 233; Planetary shaft 234; Bearing 24; Gear set 25; Housing 251; Gear 252; Slot 253; Countersunk screw hole 224; Elastic clutch 3; Elastic wave ring 31; Spindle 4; Output shaft section 41; Square hole 411; Input shaft section 42; External gear 421; Driven grinding disc 43; Handle 5; Torsion spring 6; Bushing 7. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0036] Please see Figure 1 , Figure 2 and Figure 3 The clutch transmission device of the smart door lock includes: housing 1, gearbox 2, elastic clutch 3, spindle 4 and handle 5, wherein the center lines of the gearbox 2, elastic clutch 3, spindle 4 and handle 5 coincide.

[0037] The housing 1 includes a front cover 11 and a rear cover 12. The front cover 11 and the rear cover 12 are fastened together to form a receiving cavity of the housing 1. A front through hole 111 and a rear through hole 121 are respectively provided in the middle of the front cover 11 and the rear cover 12, and the central axes of the front through hole 111 and the rear through hole 121 coincide.

[0038] The spindle 4 is inserted into the front through hole 111 of the front end cover 11 of the housing 1. The spindle 4 is used to connect the lock cylinder of the smart door lock. The gearbox 2 is inserted into the rear through hole 121 of the rear end cover 12 of the housing 1. The gearbox 2 can transmit the torque generated by the motor 21 to the spindle 4. The spindle 4 rotates clockwise or counterclockwise due to the torque of the motor 21, driving the lock cylinder of the smart door lock to open or close the door.

[0039] The elastic clutch 3 is located between the front cover 11 of the housing 1 and the front end of the gearbox 2. The elastic clutch 3 adopts an elastic wave ring 31, which can separate the spindle 4 from the transmission component 22 on the gearbox 2.

[0040] The handle 5 is located at the rear end of the gearbox 2 and can engage the transmission component 22 of the gearbox 2 and the spindle 4. Specifically, when the handle 5 is turned, the transmission component 22 on the gearbox 2 is driven to rotate forward along the axial direction of the clutch transmission device, so that the handle 5, the gearbox 2 and the transmission component 22 rotate synchronously with the spindle 4, thereby achieving manual unlocking.

[0041] A torsion spring 6 is provided between the outer side of the rear end cover 12 of the housing 1 and the gearbox 2. The gearbox 2 can be rotated and reset in the rear through hole 121 of the rear end cover 12 of the housing 1. A bushing 7 is provided between the front through hole 111 of the front end cover 11 of the housing 1 and the spindle 4, so that the spindle 4 can rotate relative to the housing 1.

[0042] like Figure 4 and Figure 5 The diagram shows the structure of gearbox 2, which includes a motor 21, a transmission component 22, a rotating component 23, a bearing 24, and a gear set 25. The motor 21 is electrically connected to the control board of the smart lock. The control board precisely controls the rotational stroke of the motor 21's output shaft. The output shaft of the motor 21 is connected to the input end of the gear set 25, and the output end of the gear set 25 is connected to the rotating component 23. The gear set 25 mainly consists of a housing 251 and gears 252. When the motor 21 is energized, it rotates, and after being transmitted through the gear set 2, torque is output through the rotating component 23. A transmission component 22 is also installed at the front end of the gear set 25. The transmission component 22 has a ring-shaped structure, and a bearing 24 is provided between the inner ring of the transmission component 22 and the rotating component 23, thereby achieving a rotatable connection between the transmission component 22 and the rotating component 23 and ensuring that the assembly of the transmission component 22 and the rotating component 23 is interference-free.

[0043] like Figure 6 As shown, on the rotating component 23 of the gearbox 2, an annular ring 231 extends outward along the axis of the rotating component 23. The inner ring of the annular ring 231 has two radially inwardly extending internal teeth 232, which are distributed circumferentially. A central shaft 233 is provided at the center of the rotating component 23. On the other side of the annular ring 231 of the rotating component 23, a plurality of planetary shafts 234 are evenly distributed circumferentially along the central shaft 233. The planetary shafts 234 are used to connect the gear set 25.

[0044] like Figure 5 and Figure 7 As shown, an annular drive grinding disc 221 is provided on the outer side of the transmission component 22 of the gearbox 2, extending outward between the inner and outer rings of the transmission component 22. The inner ring of the drive grinding disc 221 is close to the inner ring of the transmission component 22, and a force-bearing part 222 is provided between the outer ring of the drive grinding disc 221 and the outer ring of the transmission component 22. The force-bearing part 222 is adapted to the elastic wave ring 31. At the edge of the inner side of the transmission component 22 of the gearbox 2, a locking block 223 is provided extending outward in the circumferential direction. The locking block 223 is engaged with the slot 253 on the housing 251 of the gear set 25. A plurality of countersunk screw holes 224 are also provided on the force-bearing part 222. Countersunk screws are installed in the countersunk screw holes 224 to fix the transmission component 22 to the front end of the housing 251 of the gear set 25.

[0045] like Figure 8 and Figure 9 As shown, the mandrel 4 is located in the front through hole 111 of the front end cover 11 of the housing 1. A bushing 7 is provided between the mandrel 4 and the wall of the front through hole 111. The mandrel 4 includes an output shaft section 41, an input shaft section 42, and a driven grinding disc 43. The output shaft section 41 is located on the outside of the front end cover 11 of the housing 1, and its distal end has a square hole 411 along the axis of the mandrel. The square hole 411 is used to insert a square rod. The input shaft section 42 is located on the inside of the front end cover 11 of the housing 1. For receiving the output torque of the gearbox 2, two external teeth 421 are provided on the input shaft section 42, extending radially outward. These teeth are spaced apart circumferentially along the input shaft section 42. A driven grinding disc 43 is located at the connection between the output shaft section 41 and the input shaft section 42, used to mesh the transmission component 23 and the spindle 4 of the gearbox 2. The outer diameter of the driven grinding disc 43 is larger than both the outer diameter of the input shaft section 42 and the outer diameter of the output shaft section 41. The outer diameter of the driven grinding disc 43 of the spindle 4 is substantially the same as the outer diameter of the driving grinding disc 221 of the transmission component 22, and the inner diameter of the driven grinding disc 43 of the spindle 4 is also substantially the same as the inner diameter of the driving grinding disc 221 of the transmission component 22, facilitating complete meshing of the driving grinding disc 221 and the driven grinding disc 43.

[0046] like Figure 10 As shown, in this embodiment, the elastic clutch 3 is an elastic wave ring 31. The outer diameter of the elastic wave ring 31 is basically the same as the outer diameter of the transmission component 22. The inner diameter of the elastic wave ring 31 is slightly larger than the outer diameter of the active grinding disc 221. The active grinding disc 221 is located inside the inner circle of the elastic wave ring 31. The elastic wave ring 31, the active grinding disc 221 of the transmission component 22 of the gearbox 2, and the driven grinding disc 43 of the spindle 4 constitute the manual clutch mechanism of the clutch transmission device of the smart door lock, realizing the manual unlocking of the smart door lock. Specifically, when the manual drive handle 5 is rotated clockwise, the gearbox 2 is subjected to the force of the handle 5. The active grinding disc 221 of the transmission component 22 on the gearbox 2 rotates forward along the axis towards the driven grinding disc 43 of the spindle 4. The elastic wave ring 31 is subjected to the force of the force-bearing part 222 on the transmission component 22 of the gearbox 2, and undergoes compression deformation along its central axis. When the active grinding disc 221 of the transmission component 22 on the gearbox 2 moves forward and is fully engaged with the driven grinding disc 43 of the spindle 4, the gearbox 2 stops moving forward and continues to rotate in the original clockwise direction, thereby driving the spindle 4 to rotate and driving the lock cylinder of the smart door lock to unlock. When the handle 5 is released, due to the reset of the torsion spring 6, the handle 5 rotates counterclockwise relative to the gearbox 2. At the same time, the elastic wave ring 31 is elastically reset, separating the active grinding disc 221 of the transmission component 22 on the gearbox 2 from the driven grinding disc 43 of the spindle 4, completing the manual unlocking.

[0047] like Figure 5 and Figure 11As shown, in this embodiment, the gearbox 2 mainly consists of a motor 21, a transmission component 22, a rotating component 23, a bearing 24, and a gear set 25. The motor 21 is electrically connected to the control board of the smart lock. The output shaft of the motor 21 is connected to the input end of the gear set 25, and the output end of the gear set 25 is connected to the rotating component 23. The control board of the smart lock can precisely control the rotation stroke of the rotating component 23 of the motor 21. The specific structural form of the gearbox 2 can be implemented using existing technology, so it will not be described in detail here. The gearbox 2 is installed in the rear through hole 121 of the rear end cover 12 of the housing 1. The gearbox 2 can transmit the positive and negative torque generated by the motor 21 to the spindle 4, thereby realizing the unlocking or locking of the smart lock cylinder.

[0048] The external teeth 421 of the input shaft section 42 of the spindle 4 are inserted into the annular ring 231 of the rotating part 23 on the gearbox 2 to form a pivot mechanism. The motor 21 drives the rotating part 23 to rotate clockwise or counterclockwise through the gear set 25. The internal teeth 232 of the annular ring 231 of the rotating part 23 can drive the external teeth 421 of the input shaft section 42 of the spindle 4 to rotate, thereby driving the lock cylinder of the smart door lock to unlock or lock. The preset rotation stroke of the rotating part 23 of the gearbox 2 is greater than the unlocking rotation stroke of the spindle 4.

[0049] like Figure 12a Figure 12e This is a schematic diagram of the working state of the pivot mechanism composed of the mandrel 4 and the rotating member 23 in this embodiment. The two external teeth 421 of the mandrel 4 are inserted into the annular ring 231 of the rotating member 23 on the gearbox 2 to form a pivot mechanism. The two external teeth 421 of the mandrel 4 and the two internal teeth 232 of the rotating member 23 are located in the same plane, thereby forming a mating pair. Among the two internal teeth 232 of the rotating member 23, the side walls of one of the internal teeth 232 are A1 and A2, and the side walls of the other internal tooth 232 are A3 and A4, respectively. Among the two external teeth 421 of the mandrel 4, the side walls of one of the external teeth 421 are B1 and B2, respectively, and the side walls of the other external tooth 421 are B3 and B4, respectively. Figure 12a In the locked working position, the sidewalls of the two internal teeth 232 do not abut against the sidewalls of the two external teeth 421; Figure 12b As the gearbox 2 drives the internal gear 232 of the rotating component 23 to rotate clockwise, after the rotating component 23 has traveled a certain distance without load, the side walls A1 and A4 of the internal gear 232 of the rotating component 23 abut against the side walls B2 and B4 of the external gear 421 of the spindle 4, respectively. Figure 12b As shown in A1B2, A4B3; Figure 12c The rotating part 23 continues to rotate clockwise, driving the external teeth 421 of the spindle 4 to rotate synchronously clockwise, thus unlocking.

[0050] Next, as Figure 12d As shown, the gearbox 2 drives the internal gear 232 of the rotating component 23 to rotate counterclockwise until... Figure 12e In the working position, after the rotating part 23 has been unloaded for a certain stroke, the side walls A2 and A3 of the internal teeth 232 of the rotating part 23 abut against the side walls B4 and B1 of the external teeth 421 of the spindle 4, respectively. Figure 12d As shown in A2B4 and A3B1; Figure 12e The rotating part 23 continues to rotate counterclockwise, and drives the external teeth 421 of the spindle 4 to rotate synchronously counterclockwise, thereby achieving locking.

[0051] In this embodiment, in the pivot mechanism formed by the spindle 4 and the rotating component 23, when the gearbox 2 drives the rotating component 23 to switch between clockwise and counterclockwise rotation, the gearbox 2 first performs a certain stroke of no-load operation, and then drives the spindle 4 to rotate after pivoting with the spindle 4. This reduces the load current of the motor 21 of the gearbox 2 when starting, reduces the failure rate of the motor, extends its service life, and enhances the reliability of the clutch transmission device.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. The clutch transmission device of a smart door lock, characterized in that, include: Housing (1), gearbox (2), flexible clutch (3), spindle (4) and handle (5); The housing (1) includes a front cover (11) and a rear cover (12), and the front through hole (111) of the front cover (11) and the rear through hole (121) of the rear cover (12) are located on the same axis. The spindle (4) passes through the front through hole (111) of the front end cover (11) and is used to connect the lock cylinder of the smart door lock; The gearbox (2) is inserted into the rear through hole (121) of the rear end cover (12) and can transmit the torque generated by the motor to the spindle (4); The elastic clutch (3) is located at the front end of the gearbox (2) and can separate the spindle (4) from the transmission component (22) on the gearbox (2); The handle (5) is located at the rear end of the gearbox (2) and can engage the transmission component (22) and the spindle (4) of the gearbox (2); A torsion spring (6) is provided between the rear end cover (12) and the gearbox (2) for rotational connection between the two; A bushing (7) is provided between the front through hole (111) of the front cover (11) and the spindle (4), and the spindle (4) can rotate relative to the housing (1); The output shaft section (41) of the mandrel (4) is located outside the front end cover (11) of the housing (1), and a square hole (411) is provided at its far end along the axial direction of the mandrel (4) for inserting a square rod. The input shaft section (42) of the spindle (4) is located inside the front end cover (11) of the housing (1) and is used to receive the torque output by the gearbox (2); The driven grinding disc (43) of the spindle (4) is located at the connection between the output shaft section (41) and the input shaft section (42) and is used to mesh the transmission component (22) of the gearbox (2) and the spindle (4); The outer diameter of the driven grinding disc (43) is larger than the outer diameter of the input shaft section (42) and the outer diameter of the output shaft section (41); On the rotating part (23) of the gearbox (2), an annular ring (231) extends outward along the axis of the rotating part (23), and the inner ring of the annular ring (231) has radially inwardly extending internal teeth (232). The input shaft section (42) of the mandrel (4) is provided with external teeth (421) extending radially outward; The external teeth (421) and internal teeth (232) are each set to two, and are distributed at intervals along the circumference.

2. The clutch transmission device of the smart door lock as described in claim 1, characterized in that: The external teeth (421) of the spindle (4) are inserted into the annular ring (231) of the rotating part (23) to form a pivot mechanism. The preset rotation stroke of the rotating part (23) of the gearbox (2) is greater than the unlocking rotation stroke of the spindle (4).

3. The clutch transmission device of the smart door lock as described in claim 2, characterized in that: A bearing (24) is provided between the inner ring of the transmission component (22) and the outer ring of the annular ring (231) of the rotating component (23) of the gearbox (2) for rotatable connection between the transmission component (22) and the rotating component (23).

4. The clutch transmission device of the smart door lock as described in claim 3, characterized in that: The outer and inner diameters of the active grinding disc (221) of the transmission component (22) are basically the same as the outer and inner diameters of the driven grinding disc (43) of the spindle (4), which facilitates the complete meshing of the active grinding disc (221) and the driven grinding disc (43).

5. The clutch transmission device of the smart door lock as described in claim 4, characterized in that: The elastic clutch (3) is an elastic wave ring (31). The outer diameter of the elastic wave ring (31) is basically the same as the outer diameter of the transmission component (22). The inner diameter of the elastic wave ring (31) is slightly larger than the outer diameter of the active grinding disc (221).

6. The clutch transmission device of the smart door lock as described in claim 5, characterized in that: The centerlines of the gearbox (2), the elastic clutch (3), the spindle (4), and the handle (5) are aligned.

7. The clutch transmission device of the smart door lock as described in claim 6, characterized in that: The elastic wave coil (31), the active grinding disc (221) of the transmission component (22) and the driven grinding disc (43) of the spindle (4) constitute a manual clutch mechanism for manually unlocking the smart door lock.

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