Car door self-closing lock

Abstract

A self-closing door lock includes a housing, a motor, a first gear, a first shifter, a second shifter, a drive arm, a latch, a safety bar, a first conversion arm, a second conversion arm, a transmission arm, an emergency arm, and a pawl. It can lock, unlock, and unlock in an emergency. Locking and unlocking are achieved by the same motor and the first gear rotating in both directions, combined with two different transmission systems, making the structure more compact, the cost lower, and easier to install and popularize inside car doors.

Description

Technical Field

[0001] This invention relates to a lock, and more particularly to a lock for use on vehicle doors. Background Technology

[0002] Vehicle door locks are an important component of a vehicle body, a special component that integrates security, aesthetics, and craftsmanship. Vehicle door locks generally have an inward opening mechanism and an outward opening mechanism. The inward opening mechanism is used to open the door from the inside of the vehicle, and the outward opening mechanism is used to open the door from the outside. Current vehicle door locks are relatively simple in function and mainly mechanically driven. To improve ease of operation, motor-driven vehicle door locks are becoming increasingly common. Furthermore, current door locking and unlocking use two different drive mechanisms. If it is motor-driven, then locking and unlocking require two different motors, resulting in more parts, a more complex mechanism, and a larger size. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a door self-closing lock that can be controlled by a single motor to open and close the door, in view of the above-mentioned technical situation.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a car door self-closing lock, characterized in that it includes a shell, has an internal space and a lock opening on one side;

[0005] The motor, located within the aforementioned housing, is capable of forward and reverse rotation.

[0006] The first gear is rotatably disposed in the aforementioned housing and driven by the aforementioned motor, and the front end face is provided with a first pawl and a second pawl at intervals.

[0007] The first lever is rotatably disposed in the middle of the aforementioned housing, and the second lever is movably connected to the rear end;

[0008] The drive arm is rotatably disposed in the aforementioned housing, with one end capable of engaging with the aforementioned first detent and the other end being drivenly connected to the front end of the aforementioned first detent.

[0009] The latch is rotatably disposed within the aforementioned housing and near the lock opening, and has a lock groove for the lock hook. The latch is provided with a reset member. In the unlocked state, the lock groove partially overlaps with the lock opening. In the half-locked state, the lock groove rotates inward. In the fully locked state, the lock groove continues to rotate inward.

[0010] The safety bar is rotatably mounted within the aforementioned housing, and has a first disengagement shaft and a second disengagement shaft formed at its two ends, respectively. The aforementioned first disengagement shaft can drive the first derailleur to rotate.

[0011] The first conversion arm is rotatably disposed within the aforementioned housing.

[0012] The transmission arm is laterally slidably disposed within the aforementioned housing, with one end engaged with the aforementioned second paddle drive and the other end movably connected to one end of the aforementioned first conversion arm;

[0013] The second conversion arm is rotatably disposed within the aforementioned housing, and has an extension formed at its lower end, and can rotate when the first conversion arm rotates;

[0014] An emergency arm, rotatably mounted within a housing, has an inner end with a force-receiving portion that mates with the aforementioned extension portion and a protrusion that drives a second disengagement shaft of the safety bar; and

[0015] A pawl is located below the aforementioned emergency arm and can rotate coaxially with the aforementioned emergency arm. The rotation of the pawl can cause the bolt to rotate from a half-locked or locked state to an unlocked state.

[0016] The motion planes of the aforementioned first gear, first shifter, second shifter, drive arm, transmission arm, first conversion arm, and second conversion arm are parallel to each other. The motion planes of the aforementioned first shifter, second shifter, safety bar, pawl, locking tongue, and emergency arm are parallel to each other. Furthermore, the motion planes of the first gear and the first shifter are perpendicular to each other.

[0017] When locking, the motor rotates forward, driving the drive arm to rotate. The drive arm drives the first detent, the first detent drives the second detent, and the second detent drives the lock tongue to complete the self-locking.

[0018] When unlocking, the motor reverses, driving the transmission arm to move laterally. The transmission arm drives the first conversion arm, which in turn drives the second conversion arm. The second conversion arm drives the emergency arm, which in turn drives the safety bar. The safety bar causes the second lever to rotate in the opposite direction, releasing the drive on the bolt. Simultaneously, the emergency arm drives the pawl, which releases the bolt's limit. The bolt then rotates in the opposite direction under the action of the reset element, thus unlocking. For emergency unlocking, the emergency arm is pulled, driving the safety bar. The safety bar causes the second lever to rotate in the opposite direction, releasing the bolt's drive. Simultaneously, the emergency arm drives the pawl, which releases the bolt's limit. The bolt then rotates in the opposite direction under the action of the reset element, thus unlocking.

[0019] Furthermore, the housing includes a base and a mounting plate disposed on one side of the base. The first gear, drive arm, first conversion arm and second conversion arm are rotatably disposed on the mounting plate, while the first lever, safety bar and emergency arm are disposed on the base.

[0020] Preferably, the motor is driven by a first gear via a gear set, and a worm gear is provided on the motor's drive shaft. The gear set includes...

[0021] The second gear; one end has worm teeth that mesh with the aforementioned worm, and the other end has a first wheel portion; and

[0022] The third gear has a second gear portion that meshes with the aforementioned first gear portion at one end, and a third gear portion that meshes with the first gear at the other end.

[0023] The first and second conversion arms are connected by a clutch mechanism. The second conversion arm has a vertically oriented strip-shaped hole. The clutch mechanism includes...

[0024] The clutch lever is laterally movable within the housing, with one end engaging with the force-receiving part of the aforementioned emergency arm.

[0025] A clutch arm, rotatably housed within the housing, has one end movably connected to the other end of the aforementioned clutch lever; and

[0026] The clutch pin has its upper end movably connected to the other end of the aforementioned clutch arm, and its lower end has a pin shaft portion, which is located in the strip hole of the aforementioned second conversion arm.

[0027] When the aforementioned pin is located at the bottom of the strip hole, the aforementioned first conversion arm and second conversion arm are connected and driven. After the aforementioned pin moves upward, the aforementioned first conversion arm and second conversion arm are disconnected and driven.

[0028] Specifically, the first conversion arm is located at the rear end of the clutch arm and forms a drive head at one end. An avoidance groove is formed on the inner side of the drive head, and the avoidance groove is provided corresponding to the strip hole. When the pin is located at the bottom of the strip hole, the drive heads of the first conversion arm and the second conversion arm are driven connected through the pin. After the pin moves up, it enters the avoidance groove of the first conversion arm, and the first conversion arm and the second conversion arm are disconnected from the drive.

[0029] When the emergency arm is activated, the first and second conversion arms can be disconnected simultaneously, so that the lock can still be used normally through mechanical operation in the event of a power outage.

[0030] The middle part of the second conversion arm is rotatably located inside the housing, and the end away from the extension part can be connected to the internal emergency cable, making it convenient for people inside the vehicle to open the door.

[0031] The housing is equipped with a zero-position switch that resets the motor. This zero-position switch has a protruding zero-position contact head. The transmission arm is equipped with a first switching element that cooperates with the aforementioned zero-position switch. This first switching element has a first contact block with intersecting first and second inclined surfaces. The first and second inclined surfaces cooperate with the zero-position contact head to achieve on / off switching. This ensures the motor is always in its original position, guaranteeing the normal operation of the self-locking mechanism.

[0032] Furthermore, the self-locking lock also includes a half-lock switch, a full-lock switch, and a second switch element. The aforementioned second switch element is strip-shaped and is always horizontally disposed within the housing. The second switch element has a first groove that mates with the half-lock switch and a second groove that mates with the full-lock switch. Above the lock tongue is a toggle element that can rotate synchronously. When the toggle element rotates, it can drive the second switch element to move horizontally, thereby driving the corresponding half-lock switch and full-lock switch.

[0033] Furthermore, an inner handle connector and an outer handle connector are rotatably provided above the latch. An inner handle switch and an outer handle switch are provided within the housing. The inner handle switch has an inner handle contact head that mates with the inner handle connector, and the outer handle switch has an outer handle contact head that mates with the outer handle connector. When the inner handle connector rotates, it contacts the inner handle contact head of the inner handle switch, thus unlocking the door; when the outer handle connector rotates, it contacts the outer handle contact head of the outer handle switch, thus unlocking the door.

[0034] Furthermore, the self-locking device also includes a claw position switch. A third switch element is rotatably provided inside the housing near the claw, which cooperates with the aforementioned claw position switch. The third switch element can be driven to rotate when the claw is rotating.

[0035] Compared with the prior art, the advantages of the present invention are: the locking and unlocking are achieved by the same motor and the same first gear rotating in both directions and by combining two different transmission systems, which makes the structure more compact, the cost lower, and facilitates installation and popularization inside car doors. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the external structure of an embodiment.

[0037] Figure 2 This is an exploded view of an embodiment.

[0038] Figure 3 for Figure 2 A schematic diagram of the structure after the shell is removed.

[0039] Figure 4 for Figure 3 Enlarged view of the middle section structure.

[0040] Figure 5 for Figure 4 An enlarged schematic diagram after removing the second switch component.

[0041] Figure 6 for Figure 4 Enlarged schematic diagram of the clutch mechanism.

[0042] Figure 7 for Figure 6 The exploded diagram.

[0043] Figure 8 This is a schematic diagram of the embodiment in a fully locked state.

[0044] Figure 9 This is a schematic diagram of an embodiment in a semi-locked state.

[0045] Figure 10 This is a schematic diagram of the unlocked state in an embodiment. Detailed Implementation

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] like Figures 1-3 As shown, the door self-closing lock in this embodiment includes a housing 1, a motor 23, a gear set, a first gear 2, a first shifter 71, a second shifter 72, a drive arm 3, a lock tongue 59, a safety bar 6, a first conversion arm 51, a second conversion arm 52, a transmission arm 4, an emergency arm 55, a pawl 56, a clutch mechanism, a pawl position switch 1c, a zero position switch 2c, a half-lock switch 3c, a full-lock switch 4c, an inner handle switch 6c, an outer handle switch 5c, and a control board (not shown in the figure).

[0048] The housing 1 has an internal space and a locking opening 1a on one side. In this embodiment, the housing 1 includes a base 11 and a mounting plate 12, a first end cap 13, and a second end cap 14 disposed on one side of the base 11. The mounting plate 12 includes a vertical portion 121 and a horizontal portion 122. The first end cap 13 and the second end cap 14 enclose the base 11 and the mounting plate 12 from both sides. The first gear 2, the drive arm 3, the first conversion arm 51, and the second conversion arm 52 are rotatably disposed on the vertical portion 121 of the mounting plate 12. The first lever 71, the safety bar 6, and the emergency arm 55 are disposed on the base 11.

[0049] Combination Figure 3 As shown, the motor 23 is located in the internal space of the housing 1 and can rotate in both directions; the first gear 2 is rotatably located inside the housing 1 and is driven and connected to the motor 23 through a gear set, with a first pin 21 and a second pin 22 spaced apart on the front end face; specifically, the motor 23 is driven and connected to the first gear 2 through the gear set, and a worm 24 is provided on the drive shaft of the motor 23. The gear set includes a second gear 25 and a third gear 26. One end of the second gear 25 has worm teeth that mesh with the worm 24, and the other end has a first wheel portion; one end of the third gear 26 has a second wheel portion that meshes with the first wheel portion, and the other end has a third wheel portion that meshes with the first gear 2.

[0050] like Figure 3 As shown, the first lever 71 is rotatably disposed in the middle of the housing 1, and the second lever 72 is movably connected to the rear end; the drive arm 3 is rotatably disposed in the middle of the housing 1, one end of which can be connected to the first lever pin 21, and the other end is driven connected to the front end of the first lever 71.

[0051] Combination Figure 4 and Figure 5 As shown, the latch 59 is rotatably disposed within the housing 1 and near the lock opening 1a, and has a lock groove 591 for the lock hook. The latch 59 is provided with a reset element (not shown in the figure), which always forces the latch to be in the unlocked state. This reset element can be a torsion spring, tension spring, etc.

[0052] like Figure 8 As shown, in the unlocked state, the lock groove 591 partially overlaps with the lock opening 1a; as Figure 9 As shown, in the half-locked state, the lock groove 591 rotates inward; as Figure 10 As shown, in the fully locked state, the lock groove 591 continues to rotate inward. The safety lever 6 is rotatably disposed inside the housing 1, with a first disengagement shaft 61 and a second disengagement shaft 62 formed at both ends, respectively. The first disengagement shaft 61 can drive the first lever 71 to rotate.

[0053] Combination Figures 4-7 As shown, the first conversion arm 51 is rotatably disposed inside the housing 1. The first conversion arm has a drive head 512, and an avoidance groove is formed on the inner side of the drive head 512.

[0054] The transmission arm 4 is laterally movable within the housing 1. In this embodiment, the guiding engagement is achieved through the guide hole 41 on the first conversion arm 51 and the guide post 42 fixed on the mounting plate 12. One end of the first conversion arm 51 is driven to engage with the second pawl 22, and the other end is movably connected to one end 513 of the first conversion arm 51.

[0055] The second conversion arm 52 is rotatably disposed inside the housing 1, and has an extension portion 521 formed at its lower end, and can rotate when the first conversion arm 51 rotates; the middle part of the second conversion arm 52 is rotatably disposed inside the housing 1, and the end 522 away from the extension portion 521 can be connected to the inner emergency cable.

[0056] The emergency arm 55 is rotatably disposed within the housing 1. The inner end of the emergency arm 55 has a force-receiving part 551 that cooperates with the extension part 521 and a protrusion 552 that drives the second disengagement shaft 62 of the safety bar 6. The pawl 56 is disposed below the emergency arm 55 and rotates coaxially with the emergency arm 55. The rotation of the pawl 56 can drive the locking tongue 59 to rotate from a half-locked state or a locked state to an unlocked state.

[0057] The motion planes of the first gear 2, the first shifter 71, the second shifter 72, the drive arm 3, the transmission arm 4, the first conversion arm 51, and the second conversion arm 52 are parallel to each other. The motion planes of the first shifter 71, the second shifter 72, the safety bar 6, the pawl 56, the locking tongue 59, and the emergency arm 55 are parallel to each other. Furthermore, the motion planes of the first gear 2 and the first shifter 71 are perpendicular to each other.

[0058] Combination Figure 6 and Figure 7 As shown, the first conversion arm 51 and the second conversion arm 52 are connected by a clutch mechanism. The second conversion arm 52 has a vertically oriented strip hole 523. In this embodiment, the clutch mechanism includes a clutch rod 54, a clutch arm 53, and a clutch pin 58. The clutch rod 54 is laterally movable within the housing 1, and one end is driven to engage with the force-bearing part 551 of the emergency arm 55. The clutch arm 53 is rotatably disposed within the housing 1, and one end is movably connected to the other end of the clutch rod 54. The upper end of the clutch pin 58 is movably connected to the other end of the clutch arm 53, and the bottom end forms a pin shaft portion 581, which is disposed within the strip hole 523 of the second conversion arm 52.

[0059] The first shifting arm 51 is located on the rear end face of the clutch arm 53 and has a clearance groove 511 formed on its inner side. This clearance groove 511 is provided corresponding to the strip hole 523. When the pin portion 581 is located at the bottom end of the strip hole 523, the drive head 512 of the first shifting arm 51 acts on the pin portion 581, and the pin portion 581 can drive the second shifting arm 52 to rotate. After the pin portion 581 moves upward, the pin portion 581 enters the clearance groove 511 of the first shifting arm 51, thus disconnecting the drive between the first shifting arm 51 and the second shifting arm 52.

[0060] like Figure 6 and Figure 7 As shown, the zero-position switch 2c is used to reset the motor 23. The zero-position switch 2c has an extended zero-position contact head. The transmission arm 4 is provided with a first switch element 9 that cooperates with the zero-position switch. The first switch element 9 has a first contact block 93, and the first contact block 93 has an intersecting first inclined surface 91 and a second inclined surface 92. The first inclined surface 91 and the second inclined surface 92 cooperate with the zero-position contact head to realize the on / off state.

[0061] The second switch element 8 is strip-shaped and is always horizontally disposed inside the housing 1. The second switch element 8 has a first groove 81 that cooperates with the half-lock switch 3c and a second groove 82 that cooperates with the full-lock switch 4c. Above the lock tongue 59, there is a toggle element 84 that can rotate synchronously. When the toggle element 84 rotates, it can drive the second switch element 8 to move horizontally, thereby driving the corresponding half-lock switch 3c and full-lock switch 4c. Specifically, the toggle element 84 has a protrusion 841, and the push rod 8 has a connecting hole 83. The protrusion 841 is disposed in the connecting hole 83, thereby realizing the connection between the two.

[0062] An inner handle connector 501 and an outer handle connector 50 are rotatably provided above the locking tongue 59. An inner handle switch 6c and an outer handle switch 5c are provided inside the housing. The inner handle switch 6c has an inner handle contact head that mates with the inner handle connector 501, and the outer handle switch 5c has an outer handle contact head that mates with the outer handle connector 50.

[0063] A third switch 57 is rotatably provided inside the housing 1 near the claw 56, which cooperates with the claw position switch 1c. The claw position switch 1c is close to the third switch 57, and the claw 56 can drive the third switch 57 to rotate when it is in a rotating state.

[0064] In this embodiment, the reset of the components is basically achieved by torsion springs. For example, torsion spring 3d is used for the reset of drive arm 3, torsion spring 55d is used for the reset of emergency arm 55, torsion spring 53d is used for the reset of clutch arm 53, torsion spring 57d is used for the reset of third switch 57, and torsion spring 4d is used for the reset of transmission arm 4, etc.

[0065] When locked in either the half-locked or fully-open state, motor 23 rotates forward, driving the first gear 2 to rotate via the gear set. The first pin 21 of the first gear 2 drives the arm 3 to rotate, which in turn drives the first lever 71. The first lever 71 drives the second lever 72 to rotate, and the driving end 721 of the second lever 72 acts on the protrusion 592 of the latch, driving the latch 59 to rotate, thus completing the self-locking. The half-locked and fully-open states can be determined by the half-lock switch 3c, the full-lock switch 4, and the claw position switch 1c. Specifically, when the half-lock switch 3c, the full-lock switch 4, and the claw position switch 1c are all open, the self-locking lock is in the unlocked state; when they are all closed, the self-locking lock is in the closed state. The states of the other three switches are all in the half-locked state. This is controlled by the control board (not shown in the figure), and all switches and motor 23 are connected to the control board.

[0066] When unlocking, motor 23 reverses, driving the first gear 2 to rotate in reverse through the gear set. The second pin 22 of the first gear 2 drives the transmission arm 4 to move laterally. The transmission arm 4 drives the first conversion arm 51, which in turn drives the second conversion arm 52. The extended part 521 of the second conversion arm 52 acts on the bent part 551 of the emergency arm 55. The emergency arm 55 drives the pawl 56 to rotate, and the locking part 562 of the pawl 56 releases the lock tongue from its limit. At the same time, the second disengagement shaft 62 of the safety bar 6 is acted upon by the extended part 552 of the emergency arm 55, causing the safety bar 6 to rotate. The first disengagement shaft 61 of the safety bar acts on the second lever 72, causing the driving end 721 of the second lever 72 to release the lock tongue 59 from its limit. Thus, the lock tongue is unlocked under the action of the reset member.

[0067] During emergency unlocking, the emergency arm 55 is activated, driving the safety lever 6. The safety lever 6 then rotates the second lever 72, releasing its effect on the latch 59. Simultaneously, the emergency arm 55 drives the pawl 56, releasing its restriction on the latch. The latch 59 then rotates in the opposite direction under the action of the reset element, thus unlocking the lock. Furthermore, the force-bearing part 551 of the emergency arm 55 acts on the bent part 541 of the clutch lever 54. The clutch lever 54 drives the clutch arm 53 to rotate, causing the clutch pin 58 to move upward. This causes the pin shaft part 581 on the clutch pin 58 to move upward along the slot 523, disengaging the first and second switching arms 51 and preventing them from transmitting power. Thus, even in the event of a power outage, the lock can still be used normally through mechanical operation.

[0068] When the inner door handle connector 501 rotates, it touches the inner handle contact head of the inner handle switch 6c, generating a signal that causes the motor 23 to reverse and unlock. When the outer door handle connector 50 rotates, it touches the outer handle contact head of the outer handle switch 5c, generating a signal that causes the motor 23 to reverse and unlock. Central locking from inside the vehicle can be achieved through a control panel.

Claims

1. A self-sucking door lock characterized by The utility model relates to a kind of lock, including Shell (1) with content space and with lock mouth on one side; Motor (23) is located in the content space of the aforementioned shell (1), can be positive and negative rotation; First gear (2) is rotatably arranged in the aforementioned shell (1) and is drivenly connected with the aforementioned motor (23), and first pin (21) and second pin (22) are arranged on the front end face with interval; First piece (71) is rotatably arranged in the middle part of the aforementioned shell (1), and second piece (72) is movably connected to the rear end; Drive arm (3) is rotatably arranged in the middle part of the aforementioned shell (1), one end can be connected with the aforementioned first pin (21), and the other end is drivingly connected with the front end of the aforementioned first piece (71); Latching tongue (59) is rotatably arranged in the aforementioned shell (1) and is close to lock mouth and has lock slot (591) for setting lock hook;Reset member is arranged on the latching tongue;In the unlocking state, lock slot (591) partially coincides with lock mouth, in the half-locking state, lock slot (591) rotates inwards;In the completely closed state, lock slot (591) continues to rotate inwards; Bumper (6) is rotatably arranged in the aforementioned shell (1), and first disengagement shaft (61) and second disengagement shaft (62) are formed at both ends respectively, and the aforementioned first disengagement shaft (61) can drive first piece (71) to rotate, First conversion arm (51) is rotatably arranged in the aforementioned shell (1), Transmission arm (4) is transversely and translationally arranged in the aforementioned shell (1), one end is drivingly connected with the aforementioned second pin (22), and the other end is movably connected with one end of the aforementioned first conversion arm (51); Second conversion arm (52) is rotatably arranged in the aforementioned shell (1), and lower end is formed with elongated part (521), and can rotate under the condition of first conversion arm (51) rotation; Emergency arm (55) is rotatably arranged in shell (1), and the inner end of the emergency arm (55) has stress part (551) matched with the aforementioned elongated part (521) and convex part (552) drivingly connected with the second disengagement shaft (62) of the bumper (6);And Claw (56) is arranged below the aforementioned emergency arm (55) and is coaxially rotatable with the aforementioned emergency arm (55), and the claw (56) can rotate to rotate the latching tongue (59) from the half-locking state or the locking state to the unlocking state; The movement planes of the aforementioned first gear (2), first piece (71), second piece (72), drive arm (3), transmission arm (4), first conversion arm (51) and second conversion arm (52) are parallel to each other, and the movement planes of the aforementioned first piece (71), second piece (72), bumper (6), claw (56), latching tongue (59) and emergency arm (55) are parallel to each other, and the movement planes of the first gear (2) and the first piece (71) are perpendicular to each other; When locking, motor (23) drives drive arm (3) to rotate, drive arm (3) drives first piece (71), first piece (71) drives second piece (72), second piece (72) drives latching tongue (59), and self-sucking locking is completed. When unlocking, the motor reverses, drives the first gear to reverse, the second pin of the first gear drives the transmission arm to move horizontally, the transmission arm drives the first conversion arm, the first conversion arm drives the second conversion arm, the second conversion arm acts on the emergency arm, the emergency arm drives the pawl to rotate, the pawl releases the limiting of the lock tongue, at the same time, the bumper is acted on by the emergency arm, the bumper rotates, the first disengaging shaft of the bumper acts on the second driving part, so that the second driving part releases the driving of the lock tongue, and then the lock tongue is unlocked under the action of the reset part. When unlocking, the emergency arm (55) is pulled, the emergency arm (55) drives the bumper (6), the bumper (6) drives the second driving part (72) to reverse, and the driving of the lock tongue (59) is released, at the same time, the emergency arm (55) drives the pawl (56), the pawl (56) releases the limiting of the lock tongue, the lock tongue (59) reverses under the action of the reset part, and the unlocking is realized.

2. The self-suction door lock according to claim 1, wherein The housing (1) comprises a base (11) and a mounting plate (12) arranged on one side of the base (11), the first gear (2), the driving arm (3), the first conversion arm (51) and the second conversion arm (52) are rotatably arranged on the mounting plate (12), and the first driving part (71), the bumper (6) and the emergency arm (55) are arranged on the base (11).

3. The self-suction door lock according to claim 1, wherein The motor (23) is drivingly connected with the first gear (2) through a gear set, a worm (24) is arranged on a driving shaft of the motor (23), the gear set comprises a second gear (25) having a worm gear meshing with the worm (24) at one end and a first wheel part at the other end; and a third gear (26) having a second wheel part meshing with the first wheel part at one end and a third wheel part meshing with the first gear (2) at the other end.

4. The self-suction door lock according to claim 1, wherein The first conversion arm (51) and the second conversion arm (52) are connected through a clutch mechanism, the second conversion arm (52) has a vertical strip-shaped hole (523), and the clutch mechanism comprises a clutch rod (54) movably arranged in the housing (1) and drivingly connected with a force receiving part (551) of the emergency arm (55) at one end; a clutch arm (53) rotatably arranged in the housing (1) and movably connected with the other end of the clutch rod (54) at one end; and a clutch pin (58) movably connected with the other end of the clutch arm (53) at the upper end and having a pin shaft part (581) at the bottom end, the pin shaft part (581) is arranged in the strip-shaped hole (523) of the second conversion arm (52); when the pin shaft part (581) is located at the bottom end of the strip-shaped hole (523), the first conversion arm (51) and the second conversion arm (52) are connected and driven, and after the pin shaft part (581) moves upward, the first conversion arm (51) and the second conversion arm (52) are disconnected and driven.

5. The self-suction door lock according to claim 4, wherein The first conversion arm is located at the rear end surface of the clutch arm and forms a driving head at one end, an avoidance slot is formed inside the driving head, and the avoidance slot is arranged corresponding to the strip-shaped hole; the driving head of the first conversion arm and the second conversion arm is driven and connected through the pin shaft part in the state that the pin shaft part is located at the bottom end of the strip-shaped hole; after the pin shaft part moves upward, it enters the avoidance slot of the first conversion arm, and the first conversion arm and the second conversion arm are disconnected and driven.

6. The self-suction door lock according to claim 4, wherein The second conversion arm (52) is rotatably arranged in the housing (1) and is connected to the inner emergency pull cable away from the elongated part (521).

7. The self-suction door latch of claim 1, wherein The housing (1) is provided with a zero position switch (2c) capable of resetting the motor (23), the zero position switch (2c) has an extended zero position touch head, the transmission arm (4) is provided with a first switch part (9) matched with the zero position switch, the first switch part (9) has a first touch block (93) thereon, the first touch block (93) has a first inclined surface (91) and a second inclined surface (92) intersecting thereon, and the first inclined surface (91) and the second inclined surface (92) are matched with the zero position touch head to realize on-off.

8. The self-suction door lock according to claim 7, wherein The self-suction lock further comprises a half-lock switch (3c), a full-lock switch (4c) and a second switch part (8), the second switch part (8) is strip-shaped and horizontally arranged in the housing (1), the second switch part (8) has a first groove (81) matched with the half-lock switch (3c) and a second groove (82) matched with the full-lock switch (4c), the lock tongue (59) is provided with a driving part (84) capable of rotating synchronously, and the driving part (84) can drive the second switch part (8) to move horizontally under the condition of rotation, so as to drive the corresponding half-lock switch (3c) and full-lock switch (4c).

9. The self-suction door lock according to claim 8, wherein The lock tongue (59) is rotatably provided with an inner handle connecting part (501) and an outer handle connecting part (50), the housing is provided with an inner handle switch (6c) and an outer handle switch (5c), the inner handle switch (6c) has an inner handle touch head matched with the inner handle connecting part, and the outer handle switch has an outer handle touch head matched with the outer handle connecting part.

10. The self-suction door lock according to claim 9, wherein The self-suction lock further comprises a claw position switch (1c), the housing (1) is rotatably provided with a third switch part (57) matched with the claw position switch (1c) near the claw (56), and the claw (56) can drive the third switch part (57) to rotate under the condition of rotation.

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