Electronic lock assembling structure and method of electronic mechanical braking system

Abstract

The invention discloses an electronic lock assembling structure and method for an electronic mechanical braking system. The assembling structure comprises a framework assembly, a lock cylinder assembly and a coil assembly. The assembling method comprises the steps that the terminal insert is subjected to injection molding to form the framework, and the magnet is fixedly installed on the framework to form the framework assembly; the movable iron core is fixed in the middle of the lock cylinder and installed in the framework, the static iron cores are pressed at the two ends of the lock cylinder to form a lock cylinder assembly, a wire end is wound along the framework to form a coil assembly, the coil assembly is integrally coated with the plastic coating layer, and the outer assembling shell and the sealing cover are welded and fixed to form the bistable electronic lock. According to the bistable electronic lock, a double-coil series connection structure is adopted in the bistable electronic lock, the holding force of the lock cylinder can be effectively stabilized through the magnet, and the problems of coil heating and working current change caused by long-term electrification of the coil are effectively solved; and the insulating plastic-coated layer is coated, so that the coil and welding spots between the coil and the terminal can be effectively protected, and the risks that the coil layer is damaged and scratched and the welding spots are oxidized and corroded are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic locks, and in particular to an assembly structure and an assembly method of an electronic lock for an electro-mechanical braking system. Background Art

[0002] An electro-mechanical brake system (EMB) is a braking system that directly drives a braking device by electricity. Different from a traditional hydraulic braking system, the EMB system does not require hydraulic oil or compressed air as a transmission medium, but directly controls a motor and a reduction mechanism through an electric wire to achieve braking. When a driver steps on a brake pedal or receives a braking instruction, an electronic control unit (ECU) sends a signal to the motor, and the motor drives the reduction mechanism to clamp a brake disc or brake pads to generate a braking force, which can achieve a more efficient and accurate braking response.

[0003] Existing electro-mechanical brake system solutions usually adopt a monostable electromagnet as an electronic lock for a parking mechanism, which has the advantages of small volume and low cost. However, when an automobile is in a driving state, the electronic lock needs to be kept in an open state all the time to maintain the unlocking state of a gear mechanism in the parking mechanism. Therefore, the electronic lock needs to be powered on all the time, and the coil inside the electronic lock will generate heat and temperature rise after being energized for a long time, thereby increasing the resistance value and decreasing the current value of the coil. Therefore, software algorithms are required for compensation; and when the parking mechanism executes the parking function, it needs to be powered off and the lock core is pushed back to the initial position by an external spring. Therefore, the electronic lock needs to add an external spring structure, resulting in a high design cost and a complex assembly process. Summary of the Invention

[0004] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0005] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose an assembly structure and an assembly method of an electronic lock for an electro-mechanical braking system.

[0006] To achieve the above purpose, in a first aspect, the present invention provides an assembly structure of an electronic lock for an electro-mechanical braking system, including: a skeleton;

[0007] A moving iron core, a lock core and a static iron core are installed inside the skeleton, the moving iron core is installed in the middle of the lock core, and the static iron core is installed at both ends of the lock core;

[0008] On both sides of the skeleton, a first coil and a second coil are respectively wound. After the first coil and the second coil are energized, the movable iron core drives the lock core to expand and contract.

[0009] One end of the skeleton is provided with a terminal, and a magnet is installed in the middle of the skeleton. After power-off, the magnet enables the lock core to obtain a holding force through the movable iron core.

[0010] In some embodiments, the skeleton includes a support portion. An installation cavity is provided inside the support portion. Fixing portions are provided at both ends of the support portion. A groove portion is annularly provided outside the support portion. A rib portion is connected between the groove portions.

[0011] In some embodiments, the rib portion symmetrically divides the groove portion to form a magnetic force groove, and two groups of magnets are symmetrically installed on the magnetic force groove.

[0012] In some embodiments, the groove portion divides the space between the support portion and the fixing portion to form a winding groove, and the first coil and the second coil are symmetrically wound on the winding groove.

[0013] In some embodiments, a welding portion is provided on one end face of the fixing portion. After the first coil and the second coil are wound, they are connected in series and led out to the welding portion.

[0014] In some embodiments, a lock core assembly is detachably installed in the installation cavity. Abutted portions are provided on both sides of the movable iron core. An abutting cavity is opened inside the static iron core. The outer contour of the abutted portion fits the inner contour of the abutting cavity. A pin hole is opened at one end of the lock core.

[0015] In some embodiments, the skeleton, the terminal, the first coil and the second coil are integrally coated with a plastic coating layer on the outside.

[0016] In some embodiments, a housing assembly is provided outside the plastic coating layer. The housing assembly includes a housing and a cover, and the housing and the cover are laser welded.

[0017] In some embodiments, the housing is detachably installed inside the actuator. The end of the lock core passes through the pawl. A ratchet is provided on one side of the pawl. An opening pin is installed in the pin hole at the end of the lock core, and the lock core and the pawl are detachably connected through the opening pin.

[0018] Second, the present invention also provides an assembly method for an electromechanical braking system electronic lock, including:

[0019] S100, the bottom of the terminal forms a skeleton through insert molding. The double-half magnets are installed and fixed on the skeleton through the magnetic force grooves separated by the rib portions on the skeleton to form a skeleton assembly;

[0020] In S200, the moving iron core is fixed in the middle of the lock core by press-fitting. The moving iron core and the lock core are installed inside the supporting part of the skeleton. Two groups of static iron cores are symmetrically press-fitted at both ends of the lock core to form a lock core assembly.

[0021] In S300, the wire head is fixed on the fixing part at one end of the skeleton. The wire head is wound along the winding groove separated by the groove part on the skeleton to form a first coil and a second coil. The wire tail is fixed on the welding part of the fixing part at the other end of the skeleton to form a coil assembly.

[0022] In S400, the skeleton assembly, the lock core assembly and the coil assembly are integrally coated with a plastic coating on the outside. After the housing and the cover are assembled externally, laser welding is performed at the fastening part to form a bistable electronic lock.

[0023] In S500, the bistable electronic lock is fixed inside the actuator. The end of the lock core passes through the pawl hole and is inserted into the split pin from the plug port for fixation.

[0024] The present invention has the following beneficial effects:

[0025] 1. In the present invention, the bistable electronic lock adopts a double-coil series structure inside. A double-half magnet is axially positioned between the first coil and the second coil, which can effectively stabilize the holding force of the lock core. When energized, the coil forms a driving magnetic field with the moving iron core and the static iron core to drive the moving iron core to drive the lock core to extend or retract correspondingly. After power-off, the moving iron core obtains a holding force through the middle magnet, so that the lock core maintains the extended or retracted state, effectively solving the problems of coil heating and change of working current caused by long-term energization of the coil.

[0026] 2. In the present invention, the electronic lock is integrally coated with an insulating plastic coating on the outside of the skeleton assembly, the lock core assembly and the coil assembly, which can effectively protect the coil and the solder joints between the coil and the terminals, and reduce the risk of damage and scratching of the coil layer and oxidation and corrosion of the solder joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view showing the assembly structure of the electronic lock of the electro-mechanical braking system proposed by the present invention;

[0028] Figure 2 For Figure 1 It is a cross-sectional view showing the cooperation between the skeleton and the magnet in ;

[0029] Figure 3 For Figure 1 It is a schematic structural view of the parking mechanism of the actuator composed of the electronic lock;

[0030] Figure 4 It is the working mode of the assembly structure of the electronic lock of the electro-mechanical braking system proposed by the present invention Figure 1 ;

[0031] Figure 5 The working mode of the electronic lock assembly structure of the electromechanical braking system proposed by the present invention Figure 2 ;

[0032] Figure 6 It is a cross-sectional view showing the state where the core of the bistable electronic lock extends and is held;

[0033] Figure 7 It is a working mode diagram of the bistable electronic lock with the core extending when it is energized in the forward direction;

[0034] Figure 8 It is a cross-sectional view showing the state where the core of the bistable electronic lock retracts and is held;

[0035] Figure 9 It is a working mode diagram of the bistable electronic lock with the core retracting when it is energized in the reverse direction;

[0036] Figure 10 It is a schematic diagram of the injection molding process of the terminal insert of the bistable electronic lock;

[0037] Figure 11 It is a schematic diagram of the magnet assembly process of the bistable electronic lock;

[0038] Figure 12 It is a schematic diagram of the assembly process of the moving iron core and the static iron core of the bistable electronic lock;

[0039] Figure 13 It is a schematic diagram of the process of winding the coil around the skeleton of the bistable electronic lock;

[0040] Figure 14 It is a schematic diagram of the overall plastic coating process of the bistable electronic lock;

[0041] Figure 15 It is a schematic diagram of the assembly welding process of the cover and the housing of the bistable electronic lock;

[0042] Figure 16 It is a schematic flow chart of the electronic lock assembly method of the electromechanical braking system proposed by the present invention.

[0043] Legend:

[0044] 1. Skeleton assembly; 11. Skeleton; 111. Support part; 112. Installation cavity; 113. Fixed part; 114. Groove part; 115. Rib part; 116. Magnetic slot; 117. Winding slot; 118. Welding part; 12. Terminal; 13. Magnet; 2. Lock core assembly; 21. Moving iron core; 211. Contact part; 22. Lock core; 221. Plug hole; 23. Static iron core; 231. Contact cavity; 3. Coil assembly; 31. First coil; 32. Second coil; 4. Plastic coating layer; 5. Outer shell assembly; 51. Housing; 52. Cover; 6. Actuator; 7. Pawl; 8. Ratchet; 9. Split pin. Detailed implementation mode

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] The embodiment of the present application provides an electronic mechanical brake system electronic lock assembly structure and an assembly method, which solve the problems in the prior art that the electronic lock has been in the powered-on state, the coil inside will generate heat and cause a temperature rise after a long time of power-on, and then the resistance value of the coil increases and the current value decreases, and software algorithms are required for compensation; and when the parking mechanism executes the parking function, it needs to be powered off and the lock core is pushed back to the initial position by an external spring. Therefore, the electronic lock needs to add an external spring structure, resulting in a high design cost and a complex assembly process. The bistable electronic lock in the present application adopts a double-coil series structure inside, and a double-half magnet is axially positioned between the first coil and the second coil, which can effectively stabilize the holding force of the lock core. When powered on, the coil forms a driving magnetic field with the moving iron core and the static iron core to drive the moving iron core to drive the lock core to extend or retract correspondingly, and after power-off, the moving iron core obtains a holding force through the middle magnet to keep the lock core in the extended or retracted state, effectively solving the problem of coil heating and working current change caused by long-term power-on of the coil.

[0047] Specifically, please refer to the following embodiments:

[0048] Refer to Figures 1 - 15 , an embodiment of an electronic mechanical brake system electronic lock assembly structure provided by the present invention, the specific structure includes: a skeleton assembly 1, a lock core assembly 2 is arranged inside the skeleton assembly 1, and a coil assembly 3 is arranged outside the skeleton assembly 1.

[0049] Among them, the skeleton assembly 1 includes a skeleton 11, a terminal 12 and a magnet 13. The terminal 12 is arranged at one end of the skeleton 11, and the bottom of the terminal 12 forms the skeleton 11 through insert molding, and the magnet 13 is installed in the middle of the skeleton 11; in addition, the lock core assembly 2 includes a moving iron core 21, a lock core 22 and a static iron core 23. The moving iron core 21 is installed in the middle of the lock core 22, and the static iron core 23 is installed at both ends of the lock core 22; in addition, the coil assembly 3 is wound around both sides of the skeleton 11, and the coil assembly 3 includes a first coil 31 and a second coil 32.

[0050] It can be understood that after the terminal 12 receives the power-on signal from the controller, the power supply circuit of the coil assembly 3 is turned on. When the coil is energized, a driving magnetic field is formed between the moving iron core 21 and the static iron core 23, causing the moving iron core 21 to drive the lock core 22 to extend or retract correspondingly. The magnet 13 is used to generate a constant magnetic field, so that after the coil is powered off, the moving iron core 21 can obtain a holding force through the magnet 13 between the two coils, thereby keeping the lock core 22 in the extended or retracted state. Therefore, there is no need to keep the coil in the powered-on state all the time, effectively solving the problems of coil heating and changing working current caused by long-term coil power-on.

[0051] Further, as Figure 1 、 Figure 2 and Figures 10 - 15 shown, in this embodiment, the skeleton 11 includes a support portion 111, and an installation cavity 112 is formed inside the support portion 111 for installing the lock core assembly 2. In addition, fixing portions 113 are provided at both ends of the support portion 111, one end is used to support the terminal 12, and the other end is used to weld and fix the wire ends of the coil. In addition, a groove portion 114 is annularly provided outside the support portion 111, and a rib portion 115 is connected between the groove portions 114, so that the magnet 13 can be magnetically attracted and installed on the groove portion 114.

[0052] Specifically, the rib portion 115 symmetrically divides the groove portion 114 to form a magnetic force groove 116, and two sets of double-half magnets 13 are symmetrically installed on the magnetic force groove 116. When installing the magnet 13, first perform axial positioning through the groove portion 114 on the skeleton 11, and then fix the installation angle of the magnet 13 through the rib portion 115 between the groove portions 114, so that the magnet 13 can be accurately installed in the magnetic force groove 116. Correspondingly, the groove portion 114 divides the space between the support portion 111 and the fixing portion 113 to form a wire winding groove 117, and the first coil 31 and the second coil 32 are symmetrically wound around the wire winding groove 117. A welding portion 118 is provided on one end face of the fixing portion 113, so that after the first coil 31 and the second coil 32 are wound in series, they are led out to the welding portion 118. When winding the coil assembly 3, first fix one end of the enameled wire head on the fixing portion 113 near the terminal 12 on the skeleton 11 and then start winding. The wire head is wound along the wire winding groove 117 separated by the groove portion 114 on the skeleton 11 to form the first coil 31, and then passes through the magnet 13 and continues to wind to form the second coil 32. After winding, the wire tail is fixed on the welding portion 118 of the fixing portion 113 at the other end of the skeleton 11 for soldering and fixing.

[0053] Further, as Figure 1 、 Figure 2 and Figures 10 - 15As shown, in this embodiment, a lock core assembly 2 is detachably installed inside the installation cavity 112 of the framework 11. Wherein, abutting portions 211 are arranged on both sides of the moving iron core 21, and an abutting cavity 231 is correspondingly formed inside the static iron core 23, and the outer contour of the abutting portion 211 fits with the inner contour of the abutting cavity 231, so that when the moving iron core 21 drives the lock core 22 to extend or retract under the action of the driving magnetic field, it can fit with the static iron core 23.

[0054] Specifically, a pin hole 221 is further formed at one end of the lock core 22. When the end of the lock core 22 passes through the hole of the pawl 7, it can be inserted into the split pin 9 from the pin opening to connect and fix the lock core 22 and the pawl 7.

[0055] Please continue to refer to Figure 3 and Figures 13 - 15 In this embodiment, the framework 11, the terminal 12, the first coil 31 and the second coil 32 are integrally coated with a plastic coating layer 4 on the outside, which can effectively protect the coil and the solder joints between the coil and the terminal 12, and reduce the risk of the coil layer being damaged and scratched and the solder joints being oxidized and corroded.

[0056] Furthermore, a housing assembly 5 is arranged outside the plastic coating layer 4. The housing assembly 5 includes a housing 51 and a cover 52. The housing 51 and the cover 52 are laser welded to form a bistable electronic lock. After the housing 51 and the cover 52 are welded, they can not only assemble and fix the small assemblies of the internal framework assembly 1, the lock core assembly 2 and the coil assembly 3 with the housing 51, but also limit and fix the double-half magnet 13 through the housing 51.

[0057] It can be understood that the housing 51 of the electronic lock is detachably installed inside the housing 51 of the actuator 6, and the end of the lock core 22 passes through the pawl 7. One side of the pawl 7 is provided with a ratchet wheel 8. When installed, a split pin 9 is installed in the pin hole 221 at the end of the lock core 22, so that the lock core 22 and the pawl 7 are detachably connected through the split pin 9. The bistable electronic lock and the ratchet wheel 8 and the pawl 7 together form the parking mechanism of the electromechanical system actuator 6.

[0058] Working principle:

[0059] The bistable electronic lock internally adopts a double-coil series structure, and the double-half magnet 13 is used to stabilize the holding force of the lock core 22 in the middle of the coil; when the controller supplies power to the terminal 12 in the forward direction, a forward driving magnetic field will be formed between the coil, the moving iron core 21 and the static iron core 23 to drive the moving iron core 21 to drive the lock core 22 to extend correspondingly, and after the power is cut off, the moving iron core 21 obtains the holding force through the magnet 13 in the middle to keep the lock core 22 in the extended state; when the controller supplies power to the terminal 12 in the reverse direction, a reverse driving magnetic field will be formed between the coil, the moving iron core 21 and the static iron core 23 to drive the moving iron core 21 to drive the lock core 22 to retract correspondingly, and after the power is cut off, the moving iron core 21 obtains the holding force through the magnet 13 in the middle to keep the lock core 22 in the retracted state.

[0060] Reference Figure 16 , the present invention also provides an embodiment of an assembly method for an electronic lock of an electromechanical braking system, including:

[0061] S100, a skeleton 11 is formed by insert molding at the bottom of the terminal 12, and the double-half magnet 13 is installed and fixed on the skeleton 11 through the magnetic slot 116 separated by the rib portion 115 on the skeleton 11 to form a skeleton assembly 1;

[0062] S200, the moving iron core 21 is fixed in the middle of the lock core 22 by press-fitting, the moving iron core 21 and the lock core 22 are installed inside the supporting portion 111 of the skeleton 11, and two groups of static iron cores 23 are symmetrically press-fitted at both ends of the lock core 22 to form a lock core assembly 2;

[0063] S300, the wire end is fixed on the fixing portion 113 at one end of the skeleton 11, and the wire end is wound along the winding slot 117 separated by the groove portion 114 on the skeleton 11 to form a first coil 31 and a second coil 32, and the wire tail is fixed on the welding portion 118 of the fixing portion 113 at the other end of the skeleton 11 to form a coil assembly 3;

[0064] S400, the outer parts of the skeleton assembly 1, the lock core assembly 2 and the coil assembly 3 are integrally coated with a plastic coating 4, and after the outer housing 51 and the cover 52 are assembled, laser welding is performed at the fastening place to form a bistable electronic lock;

[0065] S500, the bistable electronic lock is fixed inside the actuator 6, and the end of the lock core 22 passes through the hole of the pawl 7 and is inserted into the split pin 9 from the pin insertion port for fixation.

[0066] Through the above technical solutions, the bistable electronic lock in the present application adopts a double-coil series structure inside. The double-half magnet 13 is axially positioned between the first coil 31 and the second coil 32, which can effectively stabilize the holding force of the lock core 22. When powered on, the coil forms a driving magnetic field with the moving iron core 21 and the static iron core 23 to drive the moving iron core 21 to drive the lock core 22 to extend or retract correspondingly. After power-off, the moving iron core 21 obtains a holding force through the middle magnet 13 so that the lock core 22 maintains the extended or retracted state, effectively solving the problems of coil heating and change of working current caused by long-term power-on of the coil; the electronic lock is integrally coated with an insulating plastic coating 4 outside the skeleton assembly 1, the lock core assembly 2 and the coil assembly 3, which can effectively protect the coil and the solder joints between the coil and the terminal 12, and reduce the risk of damage and scratching of the coil layer and oxidation and corrosion of the solder joints.

[0067] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electronic lock assembly structure for an electromechanical braking system, characterized in that, it includes: a skeleton (11); a moving iron core (21), a lock core (22) and a static iron core (23) are installed inside the skeleton (11), the moving iron core (21) is installed in the middle of the lock core (22), and the static iron core (23) is installed at both ends of the lock core (22); a first coil (31) and a second coil (32) are respectively wound around both sides of the skeleton (11), and after being energized, the first coil (31) and the second coil (32) drive the lock core (22) to expand and contract through the moving iron core (21); a terminal (12) is arranged at one end of the skeleton (11), a magnet (13) is installed in the middle of the skeleton (11), and after power-off, the magnet (13) enables the lock core (22) to obtain a holding force through the moving iron core (21).

2. The electronic lock assembly structure for an electromechanical braking system according to claim 1, characterized in that, the skeleton (11) includes a support part (111), an installation cavity (112) is arranged inside the support part (111), fixing parts (113) are arranged at both ends of the support part (111), a groove part (114) is annularly arranged outside the support part (111), and a rib part (115) is connected between the groove parts (114).

3. The electronic lock assembly structure for an electromechanical braking system according to claim 2, characterized in that, the rib part (115) symmetrically divides the groove part (114) to form a magnetic force groove (116), and two groups of magnets (13) are symmetrically installed on the magnetic force groove (116).

4. The electronic lock assembly structure for an electromechanical braking system according to claim 2, characterized in that, the groove part (114) divides the space between the support part (111) and the fixing part (113) to form a winding groove (117), and the first coil (31) and the second coil (32) are symmetrically wound on the winding groove (117).

5. The electronic lock assembly structure for an electromechanical braking system according to claim 2, characterized in that, a welding part (118) is arranged on one end face of the fixing part (113), and after the first coil (31) and the second coil (32) are wound, they are connected in series and led out to the welding part (118).

6. The electronic lock assembly structure for an electromechanical braking system according to claim 2, characterized in that, a lock core assembly (2) is detachably installed in the installation cavity (112), abutting parts (211) are arranged on both sides of the moving iron core (21), an abutting cavity (231) is opened inside the static iron core (23), the outer contour of the abutting part (211) fits with the inner contour of the abutting cavity (231), and a plug hole (221) is opened at one end of the lock core (22).

7. The electronic lock assembly structure for an electromechanical braking system according to claim 1, characterized in that, the skeleton (11), the terminal (12), the first coil (31) and the second coil (32) are integrally coated with a plastic coating (4) on the outside.

8. The electronic lock assembly structure of the electromechanical braking system according to claim 7, characterized in that, an outer shell assembly (5) is arranged outside the plastic coating layer (4), the outer shell assembly (5) includes a housing (51) and a cover (52), and the housing (51) and the cover (52) are laser welded.

9. The electronic lock assembly structure of the electromechanical braking system according to claim 8, characterized in that, the housing (51) is detachably installed inside the actuator (6), the end of the lock core (22) passes through the pawl (7), a ratchet wheel (8) is arranged on one side of the pawl (7), a split pin (9) is installed in the pin hole (221) at the end of the lock core (22), and the lock core (22) and the pawl (7) are detachably connected by the split pin (9).

10. An electronic lock assembly method for an electromechanical braking system, characterized in that, comprising: S100, a skeleton (11) is formed by insert molding at the bottom of the terminal (12), and the double-half magnet (13) is installed and fixed on the skeleton (11) through the magnetic force groove (116) separated by the rib portion (115) on the skeleton (11) to form a skeleton assembly (1); S200, the moving iron core (21) is fixed in the middle of the lock core (22) by press fitting, the moving iron core (21) and the lock core (22) are installed inside the support portion (111) of the skeleton (11), and two groups of static iron cores (23) are symmetrically press-fitted at both ends of the lock core (22) to form a lock core assembly (2); S300, the wire end is fixed on the fixing portion (113) at one end of the skeleton (11), and the wire end is wound along the winding groove (117) separated by the groove portion (114) on the skeleton (11) to form a first coil (31) and a second coil (32), and the wire tail is fixed on the welding portion (118) of the fixing portion (113) at the other end of the skeleton (11) to form a coil assembly (3); S400, the skeleton assembly (1), the lock core assembly (2) and the coil assembly (3) are integrally coated with a plastic coating layer (4) on the outside, and after the housing (51) and the cover (52) are assembled on the outside, laser welding is performed at the fastening place to be fixed to form a bistable electronic lock; S500, the bistable electronic lock is fixed inside the actuator (6), and the end of the lock core (22) passes through the hole of the pawl (7) and then is inserted into the split pin (9) from the pin insertion port for fixation.

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