Unlocking mechanism of automobile side door lock

Abstract

The utility model discloses an unlocking mechanism of an automobile side door lock. The unlocking mechanism comprises a central locking rod and an elastic structure, wherein the central locking rod is driven by an electric driving mechanism or shifted by a manual shifting structure under an emergency condition to linearly slide to an unlocking position, and the elastic structure is used for keeping the central locking rod at the unlocking position; an inner pulling plate is rotationally matched on the front cover of the shell, an outer pulling plate is rotationally matched on the support, the inner pulling plate and the outer pulling plate are both in shifting connection with a release plate rotationally matched on the support, and the release plate is in shifting connection with a coupling rod rotationally matched on the central locking rod; the coupling rod is in shifting connection with a pawl linkage block which is rotationally matched on the pawl shaft; the pawl linkage block is fixed with a pawl which is used for being separated from the clamping plate for unlocking; and the releasing position is that the shifting end of the releasing plate can shift the free end of the coupling rod. According to the unlocking mechanism of the automobile side door lock, mutual compatibility and linkage among parts are good, the structure is simple, assembly and operation are convenient, and cost is relatively low.

Description

Technical Field

[0001] This utility model relates to the field of automotive door lock technology, specifically to an unlocking mechanism for an automotive side door lock. Background Technology

[0002] The unlocking mechanism of existing car side door locks is a very mature technology.

[0003] However, the unlocking mechanisms of existing automotive side door locks still have the following shortcomings in actual use:

[0004] 1. In existing automotive side door locks, the internal and external unlocking mechanisms are separate systems from the electric and manual locking / unlocking mechanisms, resulting in insufficient compatibility and interoperability. 2. Furthermore, the internal and external unlocking mechanisms of existing automotive side door locks are connected to the locking lever and release plate of the locking mechanism in two completely separate parts. This results in numerous components, a relatively complex structure, cumbersome assembly, low assembly efficiency, and cumbersome operation. The flexibility, reliability, and stability of operation are insufficient, and material and labor costs are relatively high, leading to a lack of competitive price advantage in the market. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an unlocking mechanism for a car side door lock that has good compatibility and linkage between components, simple structure, convenient assembly and operation, and relatively low cost.

[0006] The technical solution of this utility model is to provide a car side door lock unlocking mechanism, including a plate that is rotatably engaged with a support on the housing via a plate shaft, a plate return spring provided on the support and the plate, and a pawl that is rotatably engaged with the support via a pawl shaft.

[0007] The unlocking mechanism of this car side door lock also includes a central locking rod that slides linearly to the unlock position by being driven by an electric drive mechanism or manually toggled by a manual toggle mechanism in an emergency, and an elastic structure that holds the central locking rod in the unlock position.

[0008] An inner pull plate is rotatably fitted on the front cover of the housing, and an outer pull plate is rotatably fitted on the support. Both the inner and outer pull plates are movably connected to a release plate rotatably fitted on the support. The release plate is movably connected to a coupling rod rotatably fitted on the central locking rod. The coupling rod is movably connected to a pawl linkage block rotatably fitted on the pawl shaft. The pawl linkage block is fixed to a pawl used to disengage from the locking plate to unlock.

[0009] The unlocking mechanism of this car side door lock also includes an inner pull plate return spring, an outer pull plate return spring, a release plate return spring, a coupling rod return spring, and a pawl linkage block return spring or a pawl return spring;

[0010] The central locking rod is positioned in the unlocked position as follows: one end of the central locking rod is located at a predetermined position at one end of the support, and the actuating end of the release plate is located at a position that overlaps laterally with the free end of the coupling rod, allowing the coupling rod to be actuated.

[0011] With the above structure, the unlocking mechanism of the automobile side door lock of this utility model has the following advantages:

[0012] The central locking lever features a clever design that departs from the existing automotive side door locks where both the locking and unlocking mechanisms operate by rotation. Instead, it employs a sliding, linearly moving central locking lever mounted on a support. Furthermore, the central locking lever serves as the central hub, integrating the internal and external unlocking mechanisms with the electric and emergency manual locking and unlocking mechanisms. These mechanisms are interconnected, compatible, and interlocking, ensuring efficient and coordinated operation.

[0013] Because both the inner and outer pull plates are connected to the release plate via a lever mechanism, and the coupling rod, pawl linkage block, and pawl and locking plate are interconnected and interlocked, the structure is simple, compact, flexible, stable, reliable, and has high transmission efficiency. The number of parts is relatively reduced, and the difficulty of cooperating between the sliding central locking rod and other parts is significantly lowered. The assembly process is relatively convenient and quick, assembly efficiency is greatly improved, and there are significant savings in material and labor assembly costs, resulting in a clear competitive advantage in the market.

[0014] Furthermore, the inner pull plate is rotatably fitted onto a first shaft fixed to the front cover. One end of the inner pull plate is the inner pulling end, and the middle of the inner pull plate has a claw extending towards the support and used to actuate the long strip of the release plate. The inner pull plate return spring is an inner pull plate return torsion spring, with the torsion spring body sleeved on the first shaft. One end of the inner pull plate return torsion spring is engaged with the torsion spring claw of the inner pull plate, and the other end is engaged with the front cover. With the above structure, one end of the inner pull plate is connected to the release plate, leaving the other end of the release plate free for the outer pull plate to actuate. This makes the unlocking mechanism of the car side door lock simple, compact, and flexible, stable, and reliable in operation.

[0015] Furthermore, the outer pull plate is rotatably fitted onto a second shaft fixed to the support. One end of the outer pull plate is the outer pulling end, and the other end has a lever post that protrudes away from the support and is used to actuate the hook plate portion of the release plate. The outer pull plate return spring is an outer pull plate return torsion spring. The torsion spring body of the outer pull plate return torsion spring is sleeved on the second shaft. One end of the outer pull plate return torsion spring is engaged with the torsion spring claw at the end of the outer pull plate with the lever post, and the other end of the outer pull plate return torsion spring is engaged with the support. With the above structure, the outer pull plate is connected to the other end of the release plate, while leaving the position of the release plate open for the inner pull plate to actuate. This makes the unlocking mechanism of the car side door lock simple, compact, flexible, stable, and reliable in operation.

[0016] Furthermore, the middle part of the long strip section of the hook-shaped release plate is rotatably fitted onto the third shaft fixed on the support. The free end of the hook section of the release plate is the actuating end for actuating the coupling rod. The hook section is the part actuated by the outer pull plate, and the long strip section is the part actuated by the inner pull plate. The release plate return spring is a release plate return torsion spring. The torsion spring body of the release plate return torsion spring is fitted onto the third shaft. One end of the release plate return torsion spring is engaged with the torsion spring block fixed to the long strip section of the release plate, and the other end of the release plate return torsion spring is engaged with the support. With the above structure, the release plate is ingeniously designed, simple in structure and full in function. It can be moved by both the inner and outer pull plates. When the central locking rod is in the unlocked position, the moving end of the release plate is aligned with the free end of the coupling rod, which smoothly, flexibly and effortlessly moves the coupling rod to unlock. This further ensures that the unlocking mechanism of the car side door lock is flexible, stable and reliable, and low in cost.

[0017] Furthermore, the structure of the coupling rod rotating and engaging with the central locking rod is as follows: the central locking rod has a hollowed-out cylindrical portion for accommodating the coupling rod, and a U-shaped plate extending inward from the hollowed-out portion. The coupling rod is engaged with the U-shaped plate by a limiting groove formed by two latches and the coupling rod body, and is axially limited. The coupling rod rotates and engages with the U-shaped plate. The coupling rod return spring is a coupling rod return torsion spring, with its body fitted onto the cylindrical portion of the coupling rod. One end of the coupling rod return torsion spring engages with a hook protruding from the upper surface of the central locking rod, and the other end engages with a hook protruding from the surface of the central locking rod at the actuating end of the coupling rod. With this structure, the rotational engagement between the coupling rod and the central locking rod, as well as the automatic reset of the coupling rod after unlocking, are more flexible, stable, and reliable. This further improves the stability and reliability of unlocking smoothly, quickly, and flexibly, and also further enhances the compatibility and linkage between components.

[0018] Furthermore, the unlocking mechanism of this car side door lock also includes an unlocking anti-reverse structure: the cylindrical portion of the coupling rod has a radially extending, downward-opening U-shaped block. The vertical rod at the free end of the U-shaped block is a circular cylinder. The surface of the central locking rod, which the coupling rod rotates during unlocking and causes the circular cylinder at the free end of the U-shaped block to slide over, has a locking arc-shaped protrusion that cooperates with the circular cylinder to prevent the central locking rod from sliding back to the upward safety position during the unlocking process. With this structure, the occasional unlocking abnormalities caused by the coupling rod retracting during the unlocking process are completely avoided, making the unlocking process more flexible, stable, and reliable.

[0019] Furthermore, the pawl linkage block is located near the central locking rod, while the pawl is located away from the central locking rod. One end of the pawl linkage block and one end of the pawl are coaxially rotated and fitted onto the pawl shaft fixed to the support. The other end of the pawl linkage block and the other end of the pawl are fixed by a connecting pin. The reset springs used for resetting the pawl linkage block and the pawl are pawl linkage block reset torsion springs. The torsion spring body is sleeved on the torsion spring hollow column at the rotating end of the pawl linkage block. One end of the pawl linkage block reset torsion spring is engaged with the pawl linkage block, and the other end is engaged with the support. With the above structure, the pawl linkage block and the pawl located on both sides of the support partition slide along the arc-shaped through hole on the support partition when rotating. Their linkage is flexible, stable, and reliable, further improving the flexibility, stability, and reliability of unlocking, and also further improving the compatibility and linkage between components. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external structure of a preferred embodiment of the automotive side door lock of this utility model.

[0021] Figure 2 This is a schematic diagram of a structure with the base plate omitted and the locking plate in the locked state.

[0022] Figure 3 This is a schematic diagram of the preferred embodiment of the automotive side door lock of this utility model, with the L-shaped cover omitted and the central locking rod in the unlocked position.

[0023] Figure 4 yes Figure 3 A schematic diagram showing the structure where the release plate can move the coupling rod (to unlock) when the central locking rod is in the unlocked position, omitting the support.

[0024] Figure 5 yes Figure 4 A schematic diagram of the structure from another angle with the card plate in the unlocked state.

[0025] Figure 6 This is a diagram showing the positions and connections of the components that unlock by moving the inner pull plate.

[0026] Figure 7 This is a diagram showing the positions and connections of the components that unlock by pulling the outer pull plate.

[0027] Figure 8 This is an enlarged structural diagram of the central locking rod in this utility model. Figure 1 .

[0028] Figure 9 This is an enlarged structural diagram of the central locking rod in this utility model. Figure 2 .

[0029] Figure 10 This is an enlarged structural schematic diagram of the inner pull plate in this utility model.

[0030] Figure 11 This is an enlarged structural schematic diagram of the outer pull plate in this utility model.

[0031] Figure 12 This is an enlarged structural schematic diagram of the release plate in this utility model.

[0032] Figure 13 This is an enlarged structural diagram of the coupling rod in this utility model. Figure 1 .

[0033] Figure 14 This is an enlarged structural diagram of the coupling rod in this utility model. Figure 2 .

[0034] Figure 15 This is an enlarged structural schematic diagram of the central locking rod limiting torsion spring in this utility model.

[0035] Figure 16 This is an enlarged structural schematic diagram of the ratchet linkage block in this utility model.

[0036] As shown in the figure:

[0037] 1. Housing; 11. Support; 111. Pin; 112. Second shaft; 113. Third shaft; 12. Rear cover; 13. L-shaped cover; 131. Front cover; 132. Top cover; 133. Insert; 14. Torsion spring pin.

[0038] 21. Clamping plate shaft; 22. Clamping plate; 23. Clamping plate return spring;

[0039] 31. Pawl shaft; 32. Pawl; 33. Pawl linkage block; 331. Hollow torsion spring column; 332. Waist-shaped lever; 34. Pawl linkage block reset torsion spring; 35. Connecting pin.

[0040] 41. Coupling rod; 411. Cylindrical part; 4111. Axial limiting block; 4112. U-shaped block; 41121. Circular column; 412. Claw; 413. Coupling rod body; 414. Limiting groove; 415. Hook; 416. Free end; 4161. Arc-shaped lever; 42. Coupling rod reset torsion spring.

[0041] 51. Central locking rod; 511. First elongated through hole; 513. Engaging groove; 514. Inner emergency lever; 515. Hollowed-out; 5151. U-shaped plate; 5152. Position for coupling rod rotation; 5153. Assembly through hole; 516. Engaging hook; 518. Locking arc-shaped protrusion; 52. Central locking rod limiting torsion spring.

[0042] 61. Inner pull plate; 611. Inner pull end; 612. Paw; 613. Push claw; 614. Torsion spring hook; 62. Inner pull plate reset torsion spring.

[0043] 71. Outer pull plate; 711. First outer pull end; 712. Actuating column; 713. Torsion spring pawl; 714. Pull rod connecting block; 72. Outer pull plate reset torsion spring.

[0044] 81. Release plate; 811. Actuating end; 812. Long strip plate section; 813. Hook plate section; 814. Torsion spring block; 82. Release plate reset torsion spring. Detailed Implementation

[0045] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions of specific embodiments are intended to aid in understanding this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various specific embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0046] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown.

[0047] The housing 1 of the car side door lock may include a support 11, a base plate on one side of the support 11, and an L-shaped cover 13 on the other side of the support 11, which is an integral part of the front cover 131 and the upper cover 132. A socket 133 for inserting a power plug is also located at one corner of the L-shaped cover 13. The housing 1 also includes a rear cover 12 connected to the support 11 and the front cover 131.

[0048] A preferred embodiment of the unlocking mechanism of this utility model's automotive side door lock includes a latching plate 22 rotatably fitted on a support 11 of the housing 1 via a latching plate shaft 21, a latching plate return spring 23 disposed on the support 11 and the latching plate 22, and a pawl 32 rotatably fitted on the support 11 via a pawl shaft 31. The latching plate return spring 23 can be a latching plate return torsion spring. The bottom ends of both the latching plate shaft 21 and the pawl shaft 31 can be fixed as a single piece to the support 11, also known as a base. Both the latching plate 22 and the pawl 32 can be installed on the side of the support 11 near the bottom plate. The pawl 32 can be a plastic-coated pawl, and the latching plate 22 can be a plastic-coated latching plate; the plastic coating serves to reduce noise and extend service life. The pawl 32 is also called a stop pawl. The latching plate 22 is also called a ratchet or locking tongue. A locking rod or locking post on the automotive side door, which engages with the U-shaped groove of the latching plate 22 to lock the automotive side door, is not shown in the figure.

[0049] The above are existing technologies.

[0050] The inventive points of the preferred embodiment of the unlocking mechanism of the automobile side door lock of this utility model are as follows.

[0051] It also includes a central locking lever 51 that slides linearly to the unlocked position by being driven by an electric drive mechanism or manually activated by a mechanism in an emergency, and an elastic structure that holds the central locking lever 51 in the unlocked position.

[0052] See Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The central locking lever 51 is in the unlocked position. In simpler terms, if the central locking lever 51 slides to the right, it causes the coupling lever 41 to slide to the right as well. Alternatively, the coupling lever 41 slides to the right along with the central locking lever 51. One end of the central locking lever 51 is positioned at a predetermined location on the right side of the support 11, and the actuating end 811 of the release plate 81 is laterally overlapped with the free end 416 of the coupling lever 41, allowing it to actuate the coupling lever 41. The lever is then held in the unlocked position by an elastic structure such as the central locking lever limiting torsion spring 52.

[0053] An inner pull plate 61 is rotatably fitted on the front cover 131 of the housing 1, and an outer pull plate 71 is rotatably fitted on the support 11. Both the inner pull plate 61 and the outer pull plate 71 are movably connected to a release plate 81 rotatably fitted on the support 11. The release plate 81 is movably connected to a coupling rod 41 rotatably fitted on the central locking rod 51. The coupling rod 41 is movably connected to a pawl linkage block 33 rotatably fitted on the pawl shaft 31. For example, the free end 416 of the coupling rod 41 is movably connected to the waist-shaped lever 332 of the pawl linkage block 33. The pawl linkage block 33 is fixed to the pawl 32 used to engage with the locking plate 22 to lock or disengage to unlock.

[0054] The preferred embodiment of the unlocking mechanism of the automotive side door lock of this utility model further includes an inner pull plate return spring, an outer pull plate return spring, a release plate return spring, a coupling rod return spring, and a pawl linkage block return spring or a pawl return spring.

[0055] See Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The specific structure of the central locking rod 51 slidingly fitted on the support 11 can be as follows: each end of the support 11 has a pin 111 protruding from the surface of the central locking rod 51, and each end of the central locking rod 51 has a first elongated through hole 511 that slides linearly along the pin 111 to slide the central locking rod 51 to the upper locking position or the unlocked position. This structure further ensures the flexibility, stability, and reliability of the sliding of the central locking rod 51 relative to the surface of the support 11. It simplifies the sliding fit between the central locking rod 51 and the support 11 while ensuring that the central locking rod 51 is accurately, stably, and reliably positioned in the unlocked position within a predetermined stroke.

[0056] Of course, the specific structure of the central locking rod 51 slidingly fitted on the support 11 can also be a structure in which the longitudinal guide rail and the longitudinal guide groove are fitted together; or it can be a structure in which the protruding post on the bottom surface of the central locking rod is fitted with the elongated sliding groove on the support 11, etc.

[0057] See Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The torsion spring body 521 of the central locking rod limiting torsion spring 52 is fitted onto the torsion spring column 14 fixed as injection molded on the support 11. One end of the central locking rod limiting torsion spring 52 is engaged on the support 11, and the other end of the central locking rod limiting torsion spring 52 is engaged in the engaging groove 513 at the right end of the central locking rod 51, which positions the central locking rod 51 in the unlocked position.

[0058] The elastic structure can also be other specific structures, such as a tension spring on the central locking rod at one end (e.g., the right end) and the support in the unlocked state; or a spring-loaded ball on the support, which limits the movement of the ball groove on the central locking rod in the unlocked position, or the ball groove on the central locking rod in the locked position, etc.

[0059] See Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The central locking rod 51 being in the unlocked position can be specifically defined as follows: one end of the central locking rod 51, such as the right end, is located at a predetermined position at one end of the support 11, such as the right end, and the actuating end 811 of the release plate 81 is located at a position that is laterally overlapped with the free end 416 of the coupling rod 41, thus enabling the coupling rod 41 to be actuated.

[0060] The inner pull plate 61 is rotatably fitted onto a first shaft fixed to the front cover 131. One end of the inner pull plate 61 is an inner pull end 611. The inner pull plate 61 has a claw 612 extending towards the support 11 and used to actuate the long strip portion 812 of the release plate 81. The other end of the inner pull plate 61 has a push claw 613 for manually unlocking the safety mechanism in an emergency situation, in another utility model submitted on the same day, by pushing the central locking rod 51 to the unlock position via an inner emergency lever 514. The inner pull plate return spring is an inner pull plate return torsion spring 62. The torsion spring body of the inner pull plate return torsion spring 62 is fitted onto the first shaft. One end of the inner pull plate return torsion spring 62 is engaged with the torsion spring hook 614 at the end of the inner pull plate 61 where the push claw 613 is located, and the other end of the inner pull plate return torsion spring 62 is engaged with the front cover 131.

[0061] The outer pull plate 71 is rotatably fitted onto the second shaft 112 fixed to the support 11. One end of the outer pull plate 71 is an outer pull end, such as the first outer pull end 711. The other end of the outer pull plate 71 has a deflecting post 712 that protrudes away from the support and is used to actuate the hook plate portion 813 of the release plate 81. A pull rod connecting block 714 can be engaged on the first outer pull end 711. The outer pull plate return spring is an outer pull plate return torsion spring 72. The torsion spring body of the outer pull plate return torsion spring 72 is fitted onto the second shaft 112. One end of the outer pull plate return torsion spring 72 is engaged on the torsion spring claw 713 at the end of the outer pull plate 71 where the deflecting post 712 is located, and the other end of the outer pull plate return torsion spring 72 is engaged on the support 11.

[0062] The middle part of the long strip portion 812 of the hook-shaped release plate 81 is rotatably fitted onto the third shaft 113 fixed on the support 11. The free end of the hook portion 813 of the release plate 81 is the actuating end 811 used to actuate the coupling rod 41. The hook portion 813 is the part actuated by the outer pull plate 71, and the long strip portion 812 is the part actuated by the inner pull plate 61. The actuating end 811 can also be called an actuating block. The release plate return spring is a release plate return torsion spring 82. The torsion spring body of the release plate return torsion spring 82 is fitted onto the third shaft 113. One end of the release plate return torsion spring 82 is engaged with the torsion spring catch block 814 fixed to the long strip portion 812 of the release plate 81, and the other end of the release plate return torsion spring 82 is engaged with the support 11.

[0063] The structure in which the coupling rod 41 is rotatably engaged with the central locking rod 51 can be as follows: The central locking rod 51 has a hollow 515 for accommodating the cylindrical part 411 of the coupling rod 41. There is an inwardly extending U-shaped plate 5151 at the hollow 515. The coupling rod 411 is engaged with the U-shaped plate 5151 and axially limited by the limiting groove 414 formed by the two latches 412 and the coupling rod body 413. The coupling rod 41 is rotatably engaged with the U-shaped plate 5151. If it rotates at the arc-shaped groove at the end of the U-shaped plate 5151, this part can also be called the position 5152 for the coupling rod to rotate. The other end of the cutout 515, away from the position 5152 where the coupling rod rotates, may have a mounting through hole 5153. This mounting through hole 5153 allows the cylindrical portion 411 of the coupling rod 41 and the two symmetrically arranged latches 412 to pass through and slide against the U-shaped plate 5151 until they slide to the position 5152 where the coupling rod rotates. The coupling rod return spring is a coupling rod return torsion spring 42. The torsion spring body of the coupling rod return torsion spring 42 is fitted onto the cylindrical portion 411 of the coupling rod 41. One end of the coupling rod return torsion spring 42 is engaged in the engaging hook 516 protruding from the upper surface of the central locking rod 51, and the other end of the coupling rod return torsion spring 42 is engaged in the engaging hook 415 protruding from the surface of the central locking rod 51 at the actuating end of the coupling rod 41. An axial limiting structure, such as two axial limiting blocks 411, can be provided on the end of the cylindrical part 411 of the coupling rod 41 away from the central locking rod 51 to prevent the coupling rod from resetting. The torsion spring 42 can be used to prevent the coupling rod from axially disengaging from the cylindrical part 411 of the coupling rod 41.

[0064] In a preferred embodiment of the unlocking mechanism of the automotive side door lock of this utility model, an unlocking anti-reverse structure is also included, such as a radially extending and downward-opening U-shaped block 4112 on the cylindrical part 411 of the coupling rod, the vertical rod at the free end of the U-shaped block 4112 being a circular column 41121, the surface of the central locking rod 51 over which the circular column 41121 at the free end of the U-shaped block 4112 slides, and a locking arc-shaped protrusion 518 that cooperates with the circular column 41121 to prevent the central locking rod 51 from sliding to the left during the unlocking process.

[0065] The pawl linkage block 33 is close to the central locking rod 51, and the pawl 32 is away from the central locking rod 51. One end of the pawl linkage block 33 and one end of the pawl 32 are coaxially rotatably engaged on the pawl shaft 31 fixed to the support 11, and the other end of the pawl linkage block 33 and the other end of the pawl 32 are fixed by a connecting pin 35. The reset spring for resetting the pawl linkage block 33 and the pawl 32 is a pawl linkage block reset torsion spring 34. The torsion spring body of the pawl linkage block reset torsion spring 34 is sleeved on the hollow torsion spring post 331 at the rotating end of the pawl linkage block 33. One end of the pawl linkage block reset torsion spring 34 is engaged with the pawl linkage block 33, and the other end of the pawl linkage block reset torsion spring 34 is engaged with the support 11. It's easy to understand that because the pawl linkage block 33 and one end of the pawl 32 are rotatably engaged on the same pawl shaft 31, and their other ends are fixed to each other by connecting pins 35, they are linked. Therefore, only one return torsion spring is needed. This return torsion spring is installed as follows: Figure 6 and Figure 7 The pawl linkage block 33 shown can be used or on the pawl itself.

[0066] The central locking rod 51 can also be called a central locking plate, an intermediate locking rod, a frame-type locking component extending along the length of the support 11, or a frame-type locking plate. Rotational engagement, also known as rotational connection, generally refers to the movable fitting of individual shafts through holes. Shafts such as the first shaft, second shaft 112, third shaft 113, pawl shaft 31, and clamping plate shaft 21, etc., fixed to the support 11 or front cover 131, can be injection molded as a single unit. The free end 416 of the coupling rod 41, also known as the actuating end of the coupling rod 41, may have an arc-shaped actuating block 4161 near the support 11 at the automatic end 916 of the coupling rod 41 for actuating the pawl linkage block 33. The actuating end 811 of the release plate 81 and the free end 416 of the coupling rod 41 laterally overlap, also known as horizontal overlap or horizontal coincidence, meaning they are in a position where they can be actuated. The first outer pull end 711 of the outer pull plate 71 may also be directly connected to the pull cable without the first pull rod connecting block 714. Releasing the safety lock is also called unlocking. A toggle connection can also be understood as the two forming a toggle connection, that is, the relationship between the two is a toggle and being toggle relationship. Linear motion is also called linear movement.

[0067] It is not difficult to understand that the task of the unlocking mechanism of the car side door lock of this utility model is to perform the following steps to unlock when the central locking lever 51 is moved to the above-mentioned unlock position by the electric locking and unlocking mechanism of the car side door lock submitted on the same day or the manual locking and unlocking mechanism of the car side door lock in an emergency. The moving mechanism described in the other two utility models submitted on the same day is as follows: the electric unlocking mechanism moves the central locking lever to the right to the unlock position via a motor, worm gear, worm wheel and moving pin; or, a tool such as a screwdriver is inserted into the emergency operation groove and manually moved to the right, or the inner pull plate is pulled to make the push claw push the inner emergency moving block on the central locking lever to move the central locking lever to the right to the unlock position; or, the outer lock pull plate is manually moved to the right to drive the central locking lever to the unlock position; and the lever is limited to the unlock position by an elastic structure such as the central locking lever limiting torsion spring 52.

[0068] See Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 .

[0069] When the central locking lever 51 is in the unlocked position and is limited to the unlocked position by an elastic structure such as the central locking lever limiting torsion spring 52, the actuating end 811 of the release plate 81 is located in a position that overlaps laterally with the free end 416 of the coupling lever 41 and can actuate the coupling lever 41.

[0070] The working principle of the preferred embodiment of the automobile side door lock unlocking mechanism of this utility model is as follows:

[0071] 1. Inner Unlocking: When the central locking rod 51 is in the unlocked position, pulling the inner pull end 611 of the inner pull plate 61 via the inner handle and pull rod or pull cable (such as a steel wire) will cause the pawl 612 of the inner pull plate 61 to move the long strip portion 812 of the release plate 81, causing the release plate 81 to rotate counterclockwise around its own axis. The moving end 811 of the release plate 81 will then move the free end 416 of the coupling rod 41 to rotate counterclockwise around the axis of the cylindrical portion 411. At this time, the coupling rod 41 and the unlocking anti-reverse structure on the central locking rod 51 are in arc-shaped sliding engagement to prevent the coupling rod from slipping during the unlocking process. The phenomenon of abnormal unlocking caused by the backward movement of 41 causes the free end 416 of the coupling rod 41 to move the pawl linkage block 33 and drive the pawl 32 to rotate clockwise, so that the pawl 32 disengages from the locking plate 22. After the locking plate 22 is no longer constrained by the engagement of the pawl 32, the locking plate return spring 23 rotates counterclockwise under the spring force to unlock. After unlocking, the inner pull plate return torsion spring 62 resets the inner pull plate 61, the release plate return torsion spring 82 resets the release plate 81, the coupling rod return torsion spring 42 resets the coupling rod 41, and the pawl linkage plate return torsion spring 34 resets the pawl linkage plate 33 and the pawl 32.

[0072] II. External Unlocking: When the central locking lever 51 is in the unlocked position, pulling the outer pull end of the outer pull plate 71 (e.g., the first outer pull end 711) via the outer handle and pull rod or pull cable (e.g., a steel wire) causes the outer pull plate 71 to rotate clockwise around its own axis. The actuating pin 712 of the outer pull plate 71 actuates the hook plate portion 813 of the release plate 81, causing the release plate 81 to rotate counterclockwise around its own axis. The actuating end 811 of the release plate 81 actuates the free end 416 of the coupling rod 41 to rotate counterclockwise around the axis of the cylindrical portion 411. At this time, the coupling rod 41 and the unlocking and anti-reverse structure on the central locking lever 51 are in arc-shaped sliding engagement. To prevent unlocking abnormalities caused by the retraction of the coupling rod 41 during the unlocking process, the free end 416 of the coupling rod 41 moves the pawl linkage block 33 and drives the pawl 32 to rotate clockwise, causing the pawl 32 to disengage from the locking plate 22. After the locking plate 22 is no longer constrained by the engagement of the pawl 32, the locking plate return spring 23 rotates counterclockwise under the spring force to unlock. After unlocking, the outer pull plate return torsion spring 72 resets the outer pull plate 71, the release plate return torsion spring 82 resets the release plate 81, the coupling rod return torsion spring 42 resets the coupling rod 41, and the pawl linkage plate return torsion spring 34 resets the pawl linkage plate 33 and the pawl 32.

[0073] Components, structures, or quantities not marked above are not shown in the drawings, and some components are not marked in the drawings. The drawings are for illustrative purposes only. In case of any inconsistency between the drawings and the text description, or between the drawings themselves, the text description shall prevail.

[0074] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An unlocking mechanism for a car side door lock, comprising a latch plate rotatably engaged with a support on a housing via a latch plate shaft, a latch plate return spring disposed on the support and the latch plate, and a pawl rotatably engaged with the support via a pawl shaft; characterized in that: It also includes a central locking rod that slides linearly to the unlocked position by being driven by an electric drive mechanism or manually activated by a manual mechanism in an emergency, and an elastic structure that holds the central locking rod in the unlocked position; An inner pull plate is rotatably fitted on the front cover of the housing, and an outer pull plate is rotatably fitted on the support. Both the inner and outer pull plates are movably connected to a release plate rotatably fitted on the support. The release plate is movably connected to a coupling rod rotatably fitted on the central locking rod. The coupling rod is movably connected to a pawl linkage block rotatably fitted on the pawl shaft. The pawl linkage block is fixed to a pawl used to disengage from the locking plate to unlock. It also includes an inner pull plate reset spring, an outer pull plate reset spring, a release plate reset spring, a coupling rod reset spring, and a pawl linkage block reset spring or a pawl reset spring; The central locking rod is positioned in the unlocked position as follows: one end of the central locking rod is located at a predetermined position at one end of the support, and the actuating end of the release plate is located at a position that overlaps laterally with the free end of the coupling rod, allowing the coupling rod to be actuated.

2. The unlocking mechanism of the automobile side door lock according to claim 1, characterized in that: The inner pull plate is rotatably fitted on the first shaft fixed to the front cover. One end of the inner pull plate is the inner pull end. There is a claw extending in the middle of the inner pull plate towards the support and used to actuate the long strip of the release plate. The inner pull plate return spring is an inner pull plate return torsion spring. The torsion spring body of the inner pull plate return torsion spring is fitted on the first shaft. One end of the inner pull plate return torsion spring is engaged with the torsion spring claw of the inner pull plate, and the other end of the inner pull plate return torsion spring is engaged with the front cover.

3. The unlocking mechanism of the automotive side door lock according to claim 1, characterized in that: The outer pull plate is rotatably fitted on the second shaft fixed to the support. One end of the outer pull plate is the outer pulling end, and the other end of the outer pull plate has a lever post that protrudes away from the support and is used to actuate the hook plate part of the release plate. The outer pull plate return spring is an outer pull plate return torsion spring. The torsion spring body of the outer pull plate return torsion spring is sleeved on the second shaft. One end of the outer pull plate return torsion spring is engaged with the torsion spring claw at the end of the outer pull plate where the lever post is located, and the other end of the outer pull plate return torsion spring is engaged with the support.

4. The unlocking mechanism of the automobile side door lock according to claim 2 or 3, characterized in that: The middle part of the long strip of the release plate is rotatably fitted onto the third shaft fixed on the support. The free end of the hook plate of the release plate is the actuating end for actuating the coupling rod. The hook plate part is the part actuated by the outer pull plate, and the long strip plate part is the part actuated by the inner pull plate. The release plate return spring is a release plate return torsion spring. The torsion spring body of the release plate return torsion spring is fitted onto the third shaft. One end of the release plate return torsion spring is engaged with the torsion spring block fixed to the long strip plate of the release plate, and the other end of the release plate return torsion spring is engaged with the support.

5. The unlocking mechanism of the automobile side door lock according to claim 1, characterized in that: The structure of the coupling rod rotating and engaging with the central locking rod is as follows: the central locking rod has a hollowed-out cylindrical part for accommodating the coupling rod, and a U-shaped plate extending inward at the hollowed-out part. The coupling rod is engaged with the U-shaped plate by a limiting groove formed by two latches and the coupling rod body, and is axially limited. The coupling rod rotates and engages with the U-shaped plate. The coupling rod return spring is a coupling rod return torsion spring. The torsion spring body of the coupling rod return torsion spring is sleeved on the cylindrical part of the coupling rod. One end of the coupling rod return torsion spring is engaged in the engaging hook protruding from the upper surface of the central locking rod, and the other end of the coupling rod return torsion spring is engaged in the engaging hook protruding from the surface of the central locking rod at the actuating end of the coupling rod.

6. The unlocking mechanism of the automobile side door lock according to claim 5, characterized in that: It also includes an unlocking and anti-reverse structure: the cylindrical part of the coupling rod has a radially extending and downward-opening U-shaped block, the vertical rod at the free end of the U-shaped block is a circular column, the surface of the central locking rod that the free end of the U-shaped block slides over when the coupling rod is unlocked and rotates has a locking arc-shaped protrusion that cooperates with the circular column to prevent the central locking rod from sliding back to the safe position during the unlocking process.

7. The unlocking mechanism of the automobile side door lock according to claim 1, characterized in that: The pawl linkage block is close to the central locking rod, and the pawl is away from the central locking rod; one end of the pawl linkage block and one end of the pawl are coaxially rotated and fitted on the pawl shaft fixed to the support, and the other end of the pawl linkage block and the other end of the pawl are fixed by a connecting pin; the reset spring for resetting the pawl linkage block and the pawl is a pawl linkage block reset torsion spring, the torsion spring body of the pawl linkage block reset torsion spring is sleeved on the torsion spring hollow column at the rotating end of the pawl linkage block, one end of the pawl linkage block reset torsion spring is engaged with the pawl linkage block, and the other end of the pawl linkage block reset torsion spring is engaged with the support.

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