Electronic door lock with clutch

Abstract

The utility model discloses an electronic door lock with a clutch, which comprises an outer lock. The front knob assembly is rotationally inserted into the front shell, and a rotation limiting structure is arranged between the front shell and the front knob assembly; the lock head is installed on the front rotary knob assembly, a tail rack is arranged at the tail end of the lock head, and the tail rack can rotate relative to the lock head; the clutch piece is connected with the tail rack so as to rotate together with the tail rack, and the clutch piece can rotate relative to the front knob assembly; the motor clutch assembly is arranged on the front shell; the clutch piece is provided with a convex part, and the front knob assembly is provided with a convex column. When the motor clutch assembly is not powered, the motor clutch assembly is in a reset state, locking can be conducted by rotating the front rotary knob assembly, locking can be conducted without inserting a key, a user can use the lock conveniently, power supply operation of the motor clutch assembly is not needed in the locking process, and electricity consumption can be reduced; and convenient locking can be carried out under the conditions that the electronic door lock fails or the electric quantity is used up and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of door locks, in particular to an electronic door lock with a clutch. Background Art

[0002] Electronic door locks typically consist of an inner lock and an outer lock, which are located on either side of the door. A lock body, compatible with the inner and outer locks, is installed inside the door. Some electronic door locks have an outer lock equipped with a motor-clutch assembly, a keyhole, and a rotatable outer handle. When unlocking the door from outside, the door lock's control system receives the correct NFC, password, fingerprint, or other signals. The control system then powers the motor-clutch assembly forward, energizing the lock body and linking the outer handle. Turning the outer handle unlocks the door. Similarly, when locking the door from outside, the control system powers the motor-clutch assembly forward, energizing the lock body and linking the outer handle. Turning the outer handle locks the door. After operation, the motor-clutch assembly automatically reverses to reset, releasing the linkage between the lock body and the outer handle.

[0003] However, the above structure requires power from the motor-clutch assembly for both locking and unlocking, which consumes a lot of power, reducing the battery life and requiring frequent battery replacement. Furthermore, if the electronic door lock malfunctions or runs out of power, the motor-clutch assembly loses power and enters a reset state. At this point, the lock body and the exterior handle become inoperable, making it impossible to lock the door simply by turning the exterior handle. Instead, the user must use a key to lock the door, making exterior locking more cumbersome. Utility Model Content

[0004] The purpose of the utility model is to provide an electronic door lock with a clutch, which can facilitate the operation of locking the door from outside and reduce power consumption.

[0005] To achieve the above object, an electronic door lock with a clutch is provided, comprising an exterior lock, the exterior lock comprising: a front housing; a front knob assembly rotatably inserted into the front housing, and a rotation limiting structure is provided between the front housing and the front knob assembly, the rotation limiting structure being used to limit the rotation angle of the front knob assembly relative to the front housing; a lock head mounted on the front knob assembly, a rear end of the lock head having a rear rack, the rear rack being used to connect to a lock body and being rotatable relative to the lock head; a clutch member connected to the rear rack so as to be able to rotate together with the rear rack, and the clutch member being able to rotate relative to the front knob assembly; a motor clutch assembly being provided on the front housing and being electrically driven to limit the rotation of the clutch member relative to the front knob assembly; the clutch member having a protrusion, and the front knob assembly having a protrusion for press-fitting with the protrusion; when the electronic door lock is unlocked, the protrusion is located within the rotation range of the protrusion; when the electronic door lock is locked, the protrusion leaves the rotation range of the protrusion.

[0006] According to the electronic door lock with clutch, the rotation limiting structure includes a first stop part, a second stop part and a third stop part, the first stop part is fixed to the front knob assembly, the second stop part and the third stop part are both fixed to the front shell, the second stop part is set as two and are arranged on both sides of the third stop part, and the first stop part can be pressed against the second stop part when the front knob assembly is rotated; the front knob assembly or the front shell is provided with a first torsion spring, and the two torsion arms of the first torsion spring are arranged on both sides of the first stop part and the third stop part.

[0007] According to the electronic door lock with clutch, the front knob assembly includes a front knob cover, a fixed part and a rotating part. The front knob cover and the rotating part are respectively arranged on both sides of the front shell. The fixed part is rotatably inserted into the front shell and is fixedly connected to the front knob cover and the rotating part respectively. A fixed cavity is formed between the front knob cover and the fixed part. The lock head is arranged in the fixed cavity, and the tail rack extends backward from the rotating part.

[0008] According to the electronic door lock with clutch, a first mounting slot is provided on the rear side of the rotating member, the clutch member is rotatably inserted into the first mounting slot, and the tail rack is passed through the clutch member.

[0009] According to the electronic door lock with clutch, the motor clutch assembly includes a motor clutch, a pin and a spring member, the motor clutch is arranged on the front shell, and the output end of the motor clutch is provided with a pressure strip, the pin is slidably inserted into the front knob assembly and is located between the clutch member and the pressure strip, the side wall of the clutch member is provided with a clutch groove for inserting the pin, and the spring member is arranged between the pin and the front knob assembly; the motor clutch is used to push the pin toward the clutch member through the pressure strip, and the spring member is used to push the pin back to the clutch member; when the electronic door lock is locked, the clutch groove is opposite to the pin.

[0010] According to the electronic door lock with clutch, the clutch groove and the convex portion are both provided in two numbers and are respectively provided on both sides of the clutch member.

[0011] According to the electronic door lock with clutch, a first cover body is provided on the rear side of the front shell, a cylinder shell and a column rod are provided on the rear side of the first cover body, and the column rod is located inside the cylinder shell and is provided as at least two parallel arranged columns.

[0012] According to the electronic door lock with clutch, it also includes a rear lock, which includes a rear shell and a rear knob assembly arranged on the rear shell, and the rear knob assembly has a transmission socket opposite to the tail rack.

[0013] According to the electronic door lock with clutch, the rear knob assembly includes a rear knob cover, a limiter and a retaining spring. The rear knob cover and the limiter are respectively arranged on both sides of the rear shell, and the rear knob cover has an axis section that is rotatably inserted into the rear shell and an installation section that is slidably inserted into the limiter. The retaining spring is located on the side of the limiter facing away from the rear shell, and is clamped and sleeved on the installation section. An elastic limiting structure is provided between the limiter and the rear shell.

[0014] According to the electronic door lock with clutch, the elastic limiting structure includes a first limiting column, a second limiting column, a third limiting column, a limiting screw and a second torsion spring. The first limiting column and the second limiting column are fixed on the rear shell at intervals, the third limiting column is fixed on the limiting part, the limiting screw is arranged on the second limiting column and abuts the side wall of the limiting part, and the second torsion spring is fixedly connected to the first limiting column and the third limiting column respectively; the elastic limiting structure is set as two and is arranged on both sides of the shaft section.

[0015] Beneficial effects: The electronic door lock can be locked and unlocked by inserting the key into the lock; when the electronic door lock can be powered, the motor clutch assembly is powered and runs forward to link the front knob assembly with the clutch, and the door can be locked and unlocked by turning the front knob assembly; when the motor clutch assembly is not powered, the motor clutch assembly is in a reset state, and the door can be locked by turning the front knob assembly, and there is no need to lock by inserting the key, which is convenient for users. Moreover, the motor clutch assembly does not need to be powered when locking, which can reduce power consumption. It can also be conveniently locked when the electronic door lock fails or the power is exhausted.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0018] Figure 1 This is the structural diagram of the external lock;

[0019] Figure 2 This is a structural diagram of the external lock from another perspective;

[0020] Figure 3 It is a cross-sectional view of the outer lock;

[0021] Figure 4 This is the first exploded view of the outer lock;

[0022] Figure 5 This is the second exploded view of the outer lock;

[0023] Figure 6 It is a cross-sectional view of the outer locking structure;

[0024] Figure 7 This is the structural diagram of the rear lock;

[0025] Figure 8 is a cross-sectional view of the rear lock;

[0026] Figure 9 This is an exploded view of the rear lock;

[0027] Figure 10 The rear view of the rear lock. DETAILED DESCRIPTION

[0028] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of this utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] Reference Figure 1-10 , an electronic door lock with a clutch, including an outer lock and a rear lock, the outer lock is installed on the outside of the door body, the rear lock is installed on the inside of the door body, and the lock body is installed inside the door body between the outer lock and the inner lock.

[0033] The exterior lock comprises a front housing 10, a front knob assembly 20, a lock head 30, a clutch 40, and a motor clutch assembly 50. The front knob assembly 20 is rotatably mounted on the front housing 10 and includes a boss 231. A rotation limiter is provided between the front housing 10 and the front knob assembly 20. This limiter is used to limit the rotation angle of the front knob assembly 20 relative to the front housing 10, thereby limiting the boss 231 to rotate within a certain range following the front knob assembly 20. The lock head 30 is mounted on the front knob assembly 20. The rear end of the lock head 30 includes a rear rack 31, which is connected to the lock body and can rotate relative to the lock head 30. The clutch 40 is connected to the rear rack 31 so that it can rotate together with the rear rack 31 and can rotate relative to the front knob assembly 20. The motor clutch assembly 50 is mounted on the front housing 10 and is electrically driven to restrict the clutch member 40 from rotating relative to the front knob assembly 20. The clutch member 40 has a protrusion 41 configured to press against the boss 231. When the electronic door lock is unlocked, the protrusion 41 is within the rotation range of the boss 231. When the electronic door lock is locked, the protrusion 41 is out of the rotation range of the boss 231.

[0034] Specifically, the lock cylinder 30 houses a lock core. When a key is not inserted, the tail rack 31 rotates relative to the lock core and lock cylinder 30. Upon insertion of a key, the tail rack 31 and the lock core rotate in unison, allowing the tail rack 31, lock core, and key to rotate relative to the lock cylinder 30. The tail rack 31 is plugged into the clutch 40 and the lock body, respectively. Rotation of the tail rack 31 drives the clutch 40 to rotate synchronously with the tail rack 31, driving the lock body to unlock and lock. The motor clutch assembly 50 can be reset by reversely supplying power to the motor clutch assembly 50.

[0035] Figure 4 , the electronic door lock is locked and the motor clutch assembly 50 is reset. At this time, the motor clutch assembly 50 does not link the clutch 40 with the front knob assembly 20, and rotating the front knob assembly 20 cannot drive the clutch 40 to rotate; the protrusion 41 is out of the rotation range of the boss 231, and rotating the front knob assembly 20 cannot drive the clutch 40 to rotate by pushing the protrusion 41 through the boss 231.

[0036] Before unlocking, when the motor clutch assembly 50 is in the reset state, the front knob assembly 20 can only idle relative to the rear rack 31 and the clutch 40, and cannot be driven to unlock by rotating the front knob assembly 20. However, after inserting the key, the rear rack 31 can be rotated by rotating the key to drive the lock body to unlock. When the electronic door lock is powered, the electronic door lock control system can control the motor clutch assembly 50 to receive power and operate in the forward direction. At this time, the motor clutch assembly 50 links the clutch 40 with the front knob assembly 20. Rotating the front knob assembly 20 can drive the clutch 40 to rotate, and then rotate the rear rack 31 to drive the lock body to unlock. After unlocking, the motor clutch assembly 50 runs in the reverse direction to reset, releasing the linkage between the clutch 40 and the front knob assembly 20.

[0037] When unlocked, the positions of the tail rack 31 and the clutch 40 are relative to each other. Figure 4 In the state shown, the convex portion 41 is rotated to a certain angle, and the convex portion 41 is located within the rotation range of the convex column 231. In this case, based on the reset of the motor clutch assembly 50 and the lack of power supply: when the front knob assembly 20 is rotated, the convex column 231 pushes the convex portion 41 to rotate the clutch and the tail rack 31, thereby driving the lock body to lock; after locking, it returns to the Figure 4 In the state shown, continuing to rotate the front knob assembly 20 can only cause it to idle and cannot be unlocked.

[0038] In summary, the electronic door lock can be locked and unlocked by inserting the key into the lock head 30; when the electronic door lock can be powered, the motor clutch assembly 50 is powered and runs forward to link the front knob assembly 20 with the clutch 40, and the door can be locked and unlocked by rotating the front knob assembly 20; when the motor clutch assembly 50 is not powered, the motor clutch assembly 50 is in a reset state, and the door can be locked by rotating the front knob assembly 20. There is no need to lock it by inserting the key, which is convenient for users. The motor clutch assembly 50 does not need to be powered when locking, which can reduce power consumption. It can also be conveniently locked when the electronic door lock fails or the power is exhausted.

[0039] Among them, when the electronic door lock can be powered, when it needs to be unlocked, the control system controls the motor clutch assembly 50 to be powered and run forward after receiving the correct NFC, password, fingerprint and other signals to ensure safety.

[0040] In this embodiment, the rotation limiting structure includes a first stop 111, a second stop 112, and a third stop 113. The first stop 111 is fixed to the front knob assembly 20, and the second and third stop 112, 113 are both fixed to the front housing 10. Two second stop 112 are provided, one on either side of the third stop 113. The front housing 10 is fixed with a peripheral portion 12 arranged around the front knob assembly 20, and a first torsion spring 114 is sleeved on the outer side of the peripheral portion 12. During assembly, one torsion arm of the first torsion spring 114 is located on one side of the first and third stop 111, 113, and the other torsion arm of the first torsion spring 114 is located on the other side of the first and third stop 111, 113. When the front knob assembly 20 is rotated, the first anti-rotation portion 111 can be pressed against the second anti-rotation portion 112 to limit the rotation angle of the front knob assembly 20, and through this structure, the boss 231 can be rotated within a certain angle range; after the front knob assembly 20 is rotated, it can be reset by using the torsion spring (the front knob assembly 20 in the reset state is as shown in FIG. Figure 4 shown).

[0041] In this embodiment, the front knob assembly 20 includes a front knob cover 21, a fixing part 22 and a rotating part 23. The front knob cover 21 and the rotating part 23 are respectively arranged on both sides of the front shell 10. The fixing part 22 is rotatably inserted into the front shell 10. The fixing part 22 is fixedly connected to the front knob cover 21 and the rotating part 23 by screws. A fixed cavity is formed between the front knob cover 21 and the fixing part 22. The lock head 30 is inserted into the fixed cavity, and the tail rack 31 extends backward from the rotating part 23.

[0042] In this embodiment, a first mounting slot 232 is provided on the rear side of the rotating member 23, the clutch member 40 is rotatably inserted into the first mounting slot 232, and the tail rack 31 is passed through the clutch member 40. Through this structure, the clutch member 40 can be rotatably mounted on the front knob assembly 20.

[0043] In this embodiment, the motor clutch assembly 50 includes a motor clutch 51, a pin 52, and a spring member 521. The motor clutch 51 is disposed on the front housing 10, and a pressure strip 511 is provided at the output end of the motor clutch 51. The pin 52 is slidably inserted into the front knob assembly 20 and is located between the clutch 40 and the pressure strip 511. The side wall of the clutch 40 is provided with a clutch slot 42 for inserting the pin 52. The spring member 521 is provided between the pin 52 and the front knob assembly 20. The motor clutch 51 is used to push the pin 52 toward the clutch 40 through the pressure strip 511, and the spring member 521 is used to push the pin 52 away from the clutch 40. Specifically, a second mounting slot 233 is provided in the rotating member 23. The second mounting slot 233 is through-connected at both ends. The pin 52 and the spring member 521 are located in the second mounting slot 233, and the second mounting slot 233 is covered with a limit cover 24 to prevent the pin 52 and the spring member 521 from falling out. When the electronic door lock is locked, the clutch slot 42 and the pin 52 are opposite each other, and when the motor clutch 51 is reset, the pin 52 leaves the clutch slot 42. When the motor clutch 51 is energized, it drives the pressure bar 511 to move. The pressure bar 511 pushes the pin 52 toward the clutch member 40 until it inserts into the clutch slot 42, thereby interlocking the front knob assembly 20 and the clutch member 40, restricting relative rotation between the two. Rotating the front knob assembly 20 can unlock the door.

[0044] Among them, the clutch groove 42 is set to two and is separately arranged on both sides of the clutch member 40, and the protrusion 41 is also set to two and is separately arranged on both sides of the clutch member 40. Through this structure, it can adapt to the two-way installation of the lock body to adapt to installation on left-opening and right-opening door bodies.

[0045] In this embodiment, a first cover 13 is attached to the rear side of the front housing 10 via screws. A cylindrical housing 131 and rods 132 are provided on the rear side of the first cover 13. The rods 132 are located inside the cylindrical housing 131 and are arranged in at least two parallel rows. The cylindrical housing 131 is inserted into the door opening of the door, and the lock body fits snugly around the rods 132. The rear lock is connected to the rods 132 via screws, allowing the electronic door lock to be accurately installed on the door.

[0046] In some embodiments, the clutch member 40 may be rotatably mounted on the front housing 10 or the first cover 13 .

[0047] In this embodiment, the rear lock includes a rear shell 60 and a rear knob assembly 70 arranged on the rear shell 60. A second cover body 61 is fixed to the rear shell 60 by screws. The rear knob assembly 70 has a transmission socket 711 opposite to the tail rack 31. During assembly, the tail rack 31 passes through the lock body and is inserted into the transmission socket 711.

[0048] Among them, the rear knob assembly 70 includes a rear knob cover 71, a limit member 72 and a retaining spring 73. The rear knob cover 71 and the limit member 72 are respectively arranged on both sides of the rear shell 60, and the rear knob cover 71 has an axis section 712 that is rotatably inserted into the rear shell 60 and a mounting section 713 that is slidably fitted into the limit member 72. The cross-section of the mounting section 713 is non-circular such as a runway shape and a prism shape to limit the relative rotation of the rear knob cover 71 and the limit member 72. The aforementioned transmission socket 711 is opened at the end of the mounting section 713, and the retaining spring 73 is located on the side of the limit member 72 facing away from the rear shell 60, and is clamped and sleeved on the mounting section 713. Through this structure, the rear knob assembly 70 can be rotatably installed on the rear shell 60.

[0049] An elastic limiting structure is provided between the limiting member 72 and the rear housing 60. The elastic limiting structure includes a first limiting post 81, a second limiting post 82, a third limiting post 83, a limiting screw 84, and a second torsion spring 85. The first limiting post 81 and the second limiting post 82 are fixed to the rear housing 60 at intervals, the third limiting post 83 is fixed to the limiting member 72, the limiting screw 84 is provided so that the second limiting post 82 abuts against the side wall of the limiting member 72, and the second torsion spring 85 is fixedly connected to the first limiting post 81 and the third limiting post 83. Specifically, the ends of the two torsion arms of the first torsion spring 114 are both rolled into a ring shape, the end of one torsion arm of the second torsion spring 85 is sleeved on the first limiting post 81, and the end of the other torsion arm of the second torsion spring 85 is sleeved on the third limiting post 83. Screws are installed on the tops of the first limiting post 81 and the third limiting post 83 to prevent the torsion arms from detaching.

[0050] In this embodiment, two elastic limiting structures are provided, one on each side of the shaft segment 712. Two limiting screws 84 simultaneously abut against both sides of the limiting member 72 to restrict its rotation. During installation, one of the limiting screws 84 and the corresponding second torsion spring 85 is removed according to the door opening direction, allowing the rear knob assembly 70 to rotate within a certain range.

[0051] In the above solution, the functions of the motor clutch 51 and the lock 30 are all possessed by existing products on the market, and the motor clutch 51 and the lock 30 with the above functions can be purchased from outside. Those skilled in the art are familiar with their structures and will not be described in detail here.

[0052] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An electronic door lock with a clutch, including an external lock, characterized in that: The outer lock comprises: front shell; A front knob assembly is rotatably mounted on the front housing, and a rotation limiting structure is provided between the front housing and the front knob assembly, the rotation limiting structure being used to limit the rotation angle of the front knob assembly relative to the front housing; A lock head is mounted on the front knob assembly, and a tail rack is provided at the tail end of the lock head. The tail rack is used to connect to the lock body and can rotate relative to the lock head; a clutch member connected to the tail rack so as to rotate together with the tail rack, and the clutch member is capable of rotating relative to the front knob assembly; a motor clutch assembly, disposed on the front housing and capable of being driven by electricity to restrict the clutch from rotating relative to the front knob assembly; The clutch member has a convex portion, and the front knob assembly has a convex column for pressing and fitting with the convex portion; when the electronic door lock is unlocked, the convex portion is located in the rotation range of the convex column; when the electronic door lock is locked, the convex portion leaves the rotation range of the convex column.

2. The electronic door lock with clutch according to claim 1, characterized in that: The rotation limiting structure includes a first stopper, a second stopper, and a third stopper. The first stopper is fixed to the front knob assembly, the second stopper and the third stopper are both fixed to the front shell, and the second stopper is provided in two portions and is disposed on both sides of the third stopper. When the front knob assembly rotates, the first stopper can press against the second stopper. The front knob assembly or the front shell is provided with a first torsion spring, and the two torsion arms of the first torsion spring are respectively provided on both sides of the first anti-rotation part and the third anti-rotation part.

3. The electronic door lock with clutch according to claim 1, characterized in that: The front knob assembly includes a front knob cover, a fixing part and a rotating part. The front knob cover and the rotating part are respectively arranged on both sides of the front shell. The fixing part is rotatably inserted into the front shell and is fixedly connected to the front knob cover and the rotating part respectively. A fixed cavity is formed between the front knob cover and the fixing part. The lock head is arranged in the fixed cavity, and the tail rack extends backward from the rotating part.

4. The electronic door lock with clutch according to claim 3, characterized in that: A first mounting groove is provided on the rear side of the rotating member, the clutch member is rotatably inserted into the first mounting groove, and the tail rack is passed through the clutch member.

5. An electronic door lock with clutch according to claim 1, 2 or 4, characterized in that: The motor clutch assembly includes a motor clutch, a pin and a spring member. The motor clutch is arranged on the front housing, and a pressure strip is provided at the output end of the motor clutch. The pin is slidably inserted into the front knob assembly and is located between the clutch member and the pressure strip. The side wall of the clutch member is provided with a clutch groove for inserting the pin. The spring member is arranged between the pin and the front knob assembly. The motor clutch is used to push the pin toward the clutch member through the pressure strip, and the spring member is used to push the pin back to the clutch member. When the electronic door lock is locked, the clutch slot is opposite to the pin.

6. The electronic door lock with clutch according to claim 5, characterized in that: The number of the clutch groove and the number of the convex portion are both two, and both are respectively arranged on both sides of the clutch member.

7. The electronic door lock with clutch according to claim 1, characterized in that: A first cover body is provided on the rear side of the front shell, and a cylinder shell and pillar rods are provided on the rear side of the first cover body. The pillar rods are located inside the cylinder shell and are provided in at least two parallel arrangements.

8. The electronic door lock with clutch according to claim 1, characterized in that: The utility model also includes a rear lock, which includes a rear shell and a rear knob assembly arranged on the rear shell, and the rear knob assembly is provided with a transmission socket opposite to the tail rack.

9. The electronic door lock with clutch according to claim 8, characterized in that: The rear knob assembly includes a rear knob cover, a limiter and a retaining spring. The rear knob cover and the limiter are respectively arranged on both sides of the rear shell, and the rear knob cover has an axis section that is rotatably inserted into the rear shell and an installation section that is slidably inserted into the limiter. The retaining spring is located on the side of the limiter facing away from the rear shell, and is clamped and sleeved on the installation section. An elastic limiting structure is provided between the limiter and the rear shell.

10. The electronic door lock with clutch according to claim 9, characterized in that: The elastic limiting structure includes a first limiting post, a second limiting post, a third limiting post, a limiting screw, and a second torsion spring. The first limiting post and the second limiting post are fixed to the rear shell at intervals, the third limiting post is fixed to the limiting member, the limiting screw is provided on the second limiting post and abuts against the side wall of the limiting member, and the second torsion spring is fixedly connected to the first limiting post and the third limiting post respectively. The elastic limiting structures are provided in two and are respectively arranged on both sides of the shaft segment.

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