Automobile side door lock

Abstract

The invention discloses an automobile side door lock which is characterized in that a central locking rod is arranged on a support in a sliding fit mode, and the support and the central locking rod are provided with elastic structures for limiting the central locking rod at an upper safety position or an unsafety 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 meshed with the clamping plate to lock or be separated from the clamping plate to unlock; the worm is a double-end worm without a self-locking function; and when the central locking rod is located at the unlocking position, the release plate can shift the coupling rod. The automobile side door lock is good in compatibility and linkage among parts, flexible, stable and reliable in transmission and relatively low in cost.

Description

Technical Field

[0001] This invention relates to the field of automotive door lock technology, specifically an automotive side door lock. Background Technology

[0002] Existing automotive side door lock technology is already a very mature technology.

[0003] However, the following shortcomings still exist in actual use:

[0004] 1. The existing automotive side door locks have separate electric locking and unlocking mechanisms, emergency manual locking and unlocking mechanisms, internal unlocking mechanisms, and external unlocking mechanisms, each consisting of its own components, resulting in insufficient compatibility and interoperability.

[0005] 2. Existing automotive side door locks rely on rotary motion for both locking and unlocking, which can easily lead to jamming between components. The flexibility, reliability, stability, and efficiency of the transmission system all need improvement. 3. Existing automotive side door locks have numerous components, a relatively complex structure, and are relatively cumbersome to assemble. Assembly efficiency is relatively low, and material and labor costs are relatively high, resulting in a lack of significant price competitiveness in the market. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a car side door lock with good compatibility and linkage between components, flexible, stable and reliable transmission, and relatively low cost.

[0007] The technical solution of the present invention is to provide a car side door lock, including a plate that is rotatably fitted on a support of the housing via a plate shaft, a plate return spring provided on the support and the plate, a pawl that is rotatably fitted on the support via a pawl shaft, a motor, a worm on the motor shaft, and a worm wheel meshing with the worm.

[0008] A central locking rod is slidably fitted on a support, and the support and the central locking rod have elastic structures that limit the central locking rod to the upper safety position or the unlocked position;

[0009] 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 engage with the locking plate to lock or disengage to unlock.

[0010] 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;

[0011] The worm gear is a double-headed worm gear without self-locking function. The worm wheel and the central locking rod have a toggle structure where the motor drives the worm wheel to rotate via the worm gear, thereby moving the central locking rod to the upper safety position or the unlocked position.

[0012] This vehicle side door lock also includes an inner emergency locking and unlocking structure that allows manual movement of the central locking lever to the locked or unlocked position.

[0013] This vehicle side door lock also includes an external emergency locking and unlocking mechanism that allows manual movement of the central locking lever to the locked or unlocked position.

[0014] The central locking rod is positioned in the upper safety 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 is offset from the free end of the coupling rod and cannot actuate the coupling rod.

[0015] The central locking rod is positioned in the unlocked position as follows: the other end of the central locking rod is located at a predetermined position at the other 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 and can actuate the coupling rod.

[0016] With the above structure, the automotive side door lock of the present invention has the following advantages:

[0017] The central locking lever is ingeniously designed, changing the existing automotive side door locks where both the locking and unlocking mechanisms are rotating. Instead, it uses a sliding locking lever that slides linearly on the support. The central locking lever is the core component that leads all the parts of the automotive side door lock. It forms an automotive side door lock where the electric locking and unlocking mechanisms, emergency manual locking and unlocking mechanisms, internal unlocking mechanisms, and external unlocking mechanisms are all interconnected, compatible, linked, coordinated, and cooperate with each other, resulting in a fully functional and highly efficient operation.

[0018] Because the central locking rod slides on the support, and the support and the central locking rod have elastic structures that limit the central locking rod to the upper safety position or the unlocked position, and the worm is a double-headed worm without self-locking function, the linear motion of the central locking rod basically eliminates the jamming phenomenon. Moreover, whether the central locking rod is slidably moved by the motor through the worm gear and the actuating structure, or manually moved in an emergency, or driven by the inner or outer pull plate through the release plate, coupling rod, and pawl linkage plate to unlock, its operational flexibility, stability, reliability, and transmission efficiency are all greatly improved.

[0019] The components of this car side door lock are highly compatible with each other, the number of components is relatively reduced, the structure is relatively simple, and the difficulty of the sliding central locking rod cooperating with other components is significantly reduced. The assembly process is relatively convenient and quick, the assembly efficiency is greatly improved, the material cost and labor assembly cost are significantly reduced, and the market price has a clear competitive advantage.

[0020] Furthermore, each end of the support has a pin protruding from the surface of the central locking rod, and each end of the central locking rod has a first elongated through hole that slides linearly along the pin to move the central locking rod 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 relative to the support surface. It simplifies the sliding fit between the central locking rod and the support while ensuring that the central locking rod accurately, stably, and reliably remains in the upper locking position or the unlocked position within a predetermined stroke.

[0021] Furthermore, the pin and elastic structure near the motor end are indirectly mounted on the support: an electrical pin socket is fixed to the support, the pin at that end is fixed to the electrical pin socket, and the torsion spring body of a central locking rod limiting torsion spring is fitted onto the torsion spring post fixed to the electrical pin socket. One end of the central locking rod limiting torsion spring is engaged in the slot of the electrical pin socket, and the other end of the central locking rod limiting torsion spring is engaged in either the first engaging groove at that end of the central locking rod that positions the central locking rod in the upper locking position or the second engaging groove that positions the central locking rod in the unlocked position. With this structure, the pin and limiting elastic structure, such as the central locking rod limiting torsion spring, which need to be mounted on the support, are all mounted on the electrical pin socket fixed to the support. This effectively utilizes the original structure, relatively saves installation space, and makes the structure of this automotive side door lock more compact. Moreover, the elastic structure uses the aforementioned specific central locking rod limiting torsion spring engaging structure, which is simple, stable, and reliable.

[0022] Furthermore, the inner pull plate is rotatably mounted on a first shaft fixed to the front cover. One end of the inner pull plate is the inner pull end, and the middle of the inner pull plate has a pawl extending towards the support and used to actuate the long strip of the release plate. The other end of the inner pull plate has an inner emergency lever for pushing the central locking lever to drive the central locking lever to the unlock position for manual unlocking. 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 hook at the end of the inner pull plate with the push claw, and the other end is engaged with the front cover. With the above structure, the inner pull plate has both the function of unlocking from the inside in daily use and the function of pushing the central locking lever to move to the right to unlock and further unlock in emergency situations such as a complete power outage of the car, a malfunction of the car's electrical control system, a power outage of the side door lock, or a malfunction of the side door lock motor. Its structure is simple, and its operation is flexible, stable, and reliable.

[0023] Furthermore, the outer pull plate is rotatably mounted on 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 has both the function of unlocking from the outside in daily use and the function of unlocking from the outside in emergency situations such as when the entire vehicle loses power, or when the vehicle's electrical control part malfunctions, or when the side door lock loses power or the motor fails. Its structure is simple, and its operation is flexible, stable, and reliable.

[0024] 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 yet fully functional. 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 aligns with the free end of the coupling rod, allowing for smooth, flexible, and effortless movement of the coupling rod to unlock. However, when the central locking rod is in the upper locking position, the moving end of the release plate is misaligned with the coupling rod, or is in a state of being knocked away, making it impossible to move and thus unable to unlock. This design demonstrates strong stability and reliability in both the upper locking position (unlockable) and the lower locking position (smooth, quick, and flexible unlocking), and further improves the compatibility and interoperability between components.

[0025] 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 the above 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 locking without unlocking and unlocking smoothly, quickly, and flexibly, and also further enhances the compatibility and linkage between components.

[0026] Furthermore, this automotive 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 its 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.

[0027] 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.

[0028] Furthermore, the actuation structure on the worm gear and the central locking rod is as follows: the worm gear has a pin protruding towards the central locking rod, and the central locking rod has a pin groove for accommodating the pin. With the above specific structure, the actuation structure of the worm gear on the central locking rod is simple, flexible, labor-saving, stable, and reliable.

[0029] Furthermore, the central locking lever has an emergency operation groove for manually moving the lever to the upper or lower locking position using a tool inserted from the inside. The support plate at the emergency operation groove has an elongated through hole for lateral movement. With this structure, the emergency operation groove and the central locking lever are integrated, eliminating the need for additional components and saving material costs. In emergencies, moving the central locking lever to the upper or lower locking position from the inside is flexible, effortless, stable, and reliable, further improving the compatibility and interoperability between components.

[0030] Furthermore, one end of an outer locking pull plate is rotatably fitted onto a fourth shaft fixed to the support, and the other end of the outer locking pull plate is an outer pulling end. Near the fourth shaft, the outer locking pull plate has an emergency operation pin for manually moving the central locking lever to the upper or lower locking position. One side of the central locking lever has an outwardly protruding side plate with a second elongated through hole that slides linearly along the fourth shaft to move the central locking lever to the upper or lower locking position. Outside the second elongated through hole, there is a third elongated through hole parallel to the second elongated through hole, used for the emergency pin to move the central locking lever to the upper or lower locking position. With this structure, the emergency locking and unlocking mechanisms on the outside are simple, and in emergency situations, the operation of moving the central locking lever to the upper or lower locking position is flexible, effortless, stable, and reliable, further improving the compatibility and interoperability between components. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the external structure of a preferred embodiment of the automotive side door lock of the present invention. Figure 1 .

[0032] Figure 2 This is a schematic diagram of the external structure of a preferred embodiment of the automotive side door lock of the present invention. Figure 2 .

[0033] Figure 3 yes Figure 2 A schematic diagram showing the structure with the base plate omitted and the locking plate in the locked state.

[0034] Figure 4 This is a schematic diagram of the preferred embodiment of the car side door lock of the present invention, where the L-shaped cover is omitted and the central locking rod is located in the upper safety position.

[0035] Figure 5 yes Figure 4 A schematic diagram showing that when the central locking lever is in the upper safety position, the release plate cannot move the coupling lever (cannot unlock) when the support is omitted.

[0036] Figure 6 yes Figure 5 A schematic diagram of the structure from a different angle.

[0037] Figure 7 This is a schematic diagram of the preferred embodiment of the car side door lock of the present invention, with the L-shaped cover omitted and the central locking rod in the unlocked position.

[0038] Figure 8 yes Figure 7 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.

[0039] Figure 9 yes Figure 8 A schematic diagram of the structure from another angle with the card plate in the unlocked state.

[0040] Figure 10 This is a diagram showing the positions and connections of the components that unlock by moving the inner pull plate.

[0041] Figure 11 This is a diagram showing the positions and connections of the components that unlock by pulling the outer pull plate.

[0042] Figure 12 This is an enlarged structural diagram of the central locking rod in this invention. Figure 1 .

[0043] Figure 13 This is an enlarged structural diagram of the central locking rod in this invention. Figure 2 .

[0044] Figure 14 This is an enlarged structural schematic diagram of the inner pull plate in this invention.

[0045] Figure 15 This is an enlarged structural schematic diagram of the outer pull plate in this invention.

[0046] Figure 16 This is an enlarged structural schematic diagram of the release plate in this invention.

[0047] Figure 17 This is an enlarged structural schematic diagram of the external locking pull plate in this invention.

[0048] Figure 18 This is a schematic diagram of the enlarged structure of the coupling rod in this invention. Figure 1 .

[0049] Figure 19 This is a schematic diagram of the enlarged structure of the coupling rod in this invention. Figure 2 .

[0050] Figure 20 This is an enlarged schematic diagram of the central locking rod limiting torsion spring in this invention.

[0051] Figure 21This is an enlarged structural schematic diagram of the ratchet linkage block in this invention.

[0052] As shown in the figure:

[0053] 1. Housing; 11. Support; 111. First pin; 112. Fourth shaft; 113. Second shaft; 114. Third shaft; 115. Rectangular through hole; 12. Base plate; 13. L-shaped cover; 131. Front cover; 132. Top cover; 133. Insert cylinder; 14. Rear cover.

[0054] 21. Clamping plate shaft; 22. Clamping plate; 23. Clamping plate return spring;

[0055] 31. Pawl shaft; 32. Pawl; 33. Pawl linkage block; 331. Torsion spring hollow column; 332. Waist-shaped lever; 34. Pawl linkage block reset torsion spring; 35. Connecting pin.

[0056] 41. Motor; 42. Worm; 43. Worm Gear; 431. Pin; 44. Worm Gear Shaft;

[0057] 51. Central locking rod; 511. First elongated through hole; 512. First engaging groove; 513. Second 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; 517. Third elongated through hole; 518. Locking arc-shaped protrusion; 519. Lever groove; 5110. Emergency operation groove; 5111. Side plate; 51111. Second elongated through hole; 52. Central locking rod limiting torsion spring.

[0058] 61. Inner pull plate; 611. Inner pull end; 612. Paw; 613. Push claw; 614. Torsion spring hook; 62. Inner pull plate reset torsion spring.

[0059] 71. Outer pull plate; 711. First outer pull end; 712. Actuating column; 713. Torsion spring pawl; 714. First pull rod connecting block; 72. Outer pull plate reset torsion spring.

[0060] 81. Release plate; 811. Actuating end; 812. Long strip plate part; 813. Hook plate part; 814. Torsion spring block; 82. Release plate reset torsion spring.

[0061] 91. Coupling rod; 911. Cylindrical part; 9111. Axial limiting block; 9112. U-shaped block; 91121. Circular column; 912. Claw; 913. Coupling rod body; 914. Limiting groove; 915. Hook; 916. Free end; 9161. Arc-shaped lever.

[0062] 101. Electrical connector, 1011. Second pin, 1012. Torsion spring pin, 1013. Slot;

[0063] 102. Outer locking pull plate; 1021. Second outer pulling end; 1022. Emergency operation lever; 1023. Second pull rod connecting block. Detailed Implementation

[0064] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions of specific embodiments are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various specific embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0065] 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 , Figure 16 , Figure 17 , Figure 18 , Figure 19 , Figure 20 and Figure 21 As shown.

[0066] The housing 1 of the car side door lock may include a support 11, a base plate 12 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 14 connected to the support 11 and the front cover 131.

[0067] A preferred embodiment of the automotive side door lock of the present invention includes a locking plate 22 rotatably fitted on a support 11 of the housing 1 via a locking plate shaft 21, a locking plate return spring 23 disposed on the support 11 and the locking plate 22, and a pawl 32 rotatably fitted on the support 11 via a pawl shaft 31. The locking plate return spring 23 can be a locking plate return torsion spring. The bottom ends of the locking plate shaft 21 and the pawl shaft 31 can be fixed as integrally formed on the support 11, also called the base. The locking plate 22 and the pawl 32 can both be installed on the side of the support 11 near the bottom plate 12. The pawl 32 can be a plastic-coated pawl, and the locking plate 22 can be a plastic-coated locking plate. The plastic coating serves to reduce noise and extend service life. The pawl 32 is also called a stop pawl. The locking plate 22 is also called a ratchet or locking tongue. A locking rod or locking lever provided on the automotive side door that engages with the U-shaped groove of the locking plate 22 to lock the automotive side door is not shown in the figure.

[0068] A preferred embodiment of the automotive side door lock of the present invention further includes a motor 41, a worm gear 42 on the motor shaft, and a worm wheel 43 meshing with the worm gear 42. The motor 41 can be fixed on a support 11, and the worm wheel 43 can be rotatably engaged via a worm wheel shaft 44 fixed on the support 11. The motor 41 can be electrically connected to the vehicle's BCM (Body Control Module). The vehicle's BCM can control the motor 41 to rotate forward and in reverse, although the forward and reverse rotation of the motor 41 may not occur at the same time.

[0069] The above are existing technologies.

[0070] The inventive points of this invention, the automotive side door lock, are as follows.

[0071] A central locking rod 51 is slidably fitted on a support 11. The support 11 and the central locking rod 51 have elastic structures that limit the central locking rod 51 to the upper locking position or the unlocked position.

[0072] 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 91 rotatably fitted on the central locking rod 51. The coupling rod 91 is movably connected to a pawl linkage block 33 rotatably fitted on the pawl shaft 31. For example, the free end 916 of the coupling rod 91 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.

[0073] Preferred embodiments of the present invention also include 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.

[0074] The worm gear 42 is a double-ended worm gear without a self-locking function. The worm wheel 43 and the central locking rod 51 have a moving mechanism whereby a motor 41 drives the worm wheel 43 to rotate via the worm gear 42, thereby actuating the central locking rod 51 to the upper locking position or the unlocked position. See also Figure 4 , Figure 5 , Figure 7 and Figure 12 It is not difficult to understand that since the worm 42 is a double-headed worm without a self-locking function, that is, the worm itself does not have a self-locking function, in emergency situations such as power outages, when the central locking lever 51 is manually moved to slide to the left or right, the worm 42 and the worm wheel 43 will not encounter any resistance, that is, they will be flexible and smooth, and can drive the worm wheel 43, the worm 42 and the motor 41 to rotate in the opposite direction.

[0075] In a preferred embodiment of the present invention, an inner emergency locking and unlocking structure is also included, which allows manual manipulation of the inner central locking lever 51 to either the locking or unlocking position.

[0076] In a preferred embodiment of the present invention, an outer emergency locking and unlocking structure is also included, which allows manual movement of the central locking lever 51 to the locking or unlocking position.

[0077] See Figure 4 , Figure 5 , Figure 7 and Figure 12 The central locking rod 51 being in the upper safety position can specifically be as follows: one end of the central locking rod 51, such as the left end, is located at a predetermined position at one end of the support 11, such as the left end, and the actuating end 811 of the release plate 81 is located at a position that is offset from the free end 916 of the coupling rod 91 and cannot actuate the coupling rod 91.

[0078] See Figure 4 , Figure 5 , Figure 7 and Figure 12 The central locking rod 51 being in the unlocked position can specifically be such that the other end of the central locking rod 51, such as the right end, is located at a predetermined position at the other 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 916 of the coupling rod 91 and can actuate the coupling rod 91.

[0079] See Figure 4 , Figure 5 , Figure 7 and Figure 12 The specific structure of the central locking rod 51 slidingly engaged with the support 11 can be as follows: Each end of the support 11 has a pin protruding from the surface of the central locking rod 51, such as a first pin 111 and a second pin 1011. Each end of the central locking rod 51 has a first elongated through hole 511 that slides linearly along the pins, such as the first pin 111 at the left end and the second pin 1011 at the right end, to slide the central locking rod 51 to the upper locking position or the unlocked position. Alternatively, the specific structure of the central locking rod 511 slidingly engaged with the support can also be a structure where a longitudinal guide rail and a longitudinal guide groove cooperate; or a structure where a protrusion on the bottom surface of the central locking rod cooperates with an elongated groove on the support, etc.

[0080] See Figure 4 , Figure 5 , Figure 7 and Figure 12The pins near the motor 41, such as the second pin 1011 on the right end, and the elastic structure, such as the central locking rod limiting torsion spring 52, can be indirectly set on the support 11. An electrical pin socket 101 is fixed on the support 11. The second pin 1011 at the right end is fixed as if integrally injection molded on the electrical pin socket 101. The torsion spring body 521 of the central locking rod limiting torsion spring 52 is fitted onto the torsion spring post 1012 fixed as if injection molded on the electrical pin socket 101. One end of the central locking rod limiting torsion spring 52 is engaged in the slot 1013 of the electrical pin socket 101. The other end of the central locking rod limiting torsion spring 52 is engaged in the first engaging groove 512 at the right end of the central locking rod 51, which positions the central locking rod 51 in the upper safety position, or the second engaging groove 513 at the right end, which positions the central locking rod 51 in the unlocked position.

[0081] Of course, the pin and elastic structure at the end closest to the motor can also be directly mounted on the support at that end, such as the right end.

[0082] 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 of the central locking rod in the unlocked position, or the ball groove of the central locking rod in the locked position, etc.

[0083] The inner pull plate 61 is rotatably fitted onto a first shaft fixed to the front cover 132. One end of the inner pull plate 61 is an inner pull end 611. The middle of the inner pull plate 61 has a pawl 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 an inner emergency lever 514 for pushing the central locking lever 51 to drive the central locking lever 51 to the unlocked position for manual release of the safety. 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 pusher pawl 613 is located, and the other end of the inner pull plate return torsion spring 62 is engaged with the front cover 131.

[0084] The outer pull plate 71 is rotatably fitted onto the second shaft 113 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 first 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 sleeved on the second shaft 113. 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.

[0085] The middle part of the long strip portion 812 of the hook-shaped release plate 81 is rotatably fitted onto the third shaft 114 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 91. 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 114. One end of the release plate return torsion spring 82 is engaged with the torsion spring retainer 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.

[0086] The structure in which the coupling rod 91 rotates and engages with the central locking rod 51 can be as follows: The central locking rod 51 has a hollow 515 for accommodating the cylindrical part 911 of the coupling rod 91. There is an inwardly extending U-shaped plate 5151 at the hollow 515. The coupling rod 91 is engaged with the U-shaped plate 5151 and axially limited by the limiting groove 914 formed by the two latches 912 and the coupling rod body 913. The coupling rod 91 rotates and engages with the U-shaped plate 5151. If it rotates at the arc 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 911 of the coupling rod 91 and the two symmetrically arranged latches 912 to pass through and slide onto 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 92. The torsion spring body of the coupling rod return torsion spring 92 is fitted onto the cylindrical portion 911 of the coupling rod 91. One end of the coupling rod return torsion spring 92 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 92 is engaged in the engaging hook 915 protruding from the surface of the central locking rod at the actuating end of the coupling rod 91. An axial limiting structure, such as two axial limiting blocks 911, can be provided on the end of the cylindrical part 911 of the coupling rod 91 away from the central locking rod 51 to prevent the coupling rod reset torsion spring 92 from axially disengaging from the cylindrical part 911 of the coupling rod 91.

[0087] A preferred embodiment of the automotive side door lock of the present invention further includes an unlocking and anti-reverse structure, such as a radially extending and downward-opening U-shaped block 9112 on the cylindrical portion 911 of the coupling rod, the vertical rod at the free end of the U-shaped block 9112 being a circular column 91121, the surface of the central locking rod 51 over which the circular column 91121 at the free end of the U-shaped block 9112 slides, and a locking arc-shaped protrusion 518 that cooperates with the circular column 91121 to prevent the central locking rod 51 from sliding to the left during the unlocking process.

[0088] 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 torsion spring hollow column 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 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 9 The pawl linkage block 33 shown can be used or on the pawl itself.

[0089] The actuating structure on the worm gear 43 and the central locking rod 51 can specifically be as follows: the worm gear 43 has a pin 431 protruding towards the central locking rod 51, and the central locking rod 51 has a pin groove 519 on its bottom surface to accommodate the pin 431. Alternatively, the actuating structure can have a pin on the bottom surface of the central locking rod at that end, and a pin groove on the worm gear to accommodate the pin. It can also have a hook on one of the worm gear and the central locking rod, and a hook ring that engages with the hook, etc.

[0090] See Figure 4 , Figure 5 , Figure 7 and Figure 12The internal emergency locking and unlocking structure for manually moving the central locking lever 51 to the upper or lower locking position can specifically be as follows: The central locking lever 51 has an emergency operation groove 5110 for manually moving a tool inside, such as moving the central locking lever 51 to the upper locking position to the left or to the lower locking position to the right. The support plate at the emergency operation groove 5110 has an elongated through hole, such as a rectangular through hole 115, for lateral movement. It is easy to understand that the length of the rectangular through hole 115 is sufficient to move the central locking lever to the upper locking position to the left and to the lower locking position to the right. The tool can be a screwdriver, etc. This emergency operation groove 5110 can also be called a manual locking emergency operation groove or a manual unlocking emergency operation groove. The locking can be moved to the left and the unlocking can be moved to the right. As described above, the safety can also be manually released by pushing the inner emergency lever 514 with the inclined surface of the pusher 613 on the inner pull plate 61 to the right. Of course, a protruding post that passes through the rectangular through hole and protrudes outward can be used instead of the emergency operation groove, and the lever can be moved laterally by applying force with a steel pipe.

[0091] The external emergency locking and unlocking structure for manually moving the central locking lever 51 to the upper or lower locking position can specifically be as follows: one end of an external locking pull plate 102 is rotatably fitted onto a fourth shaft 112 fixed on the support 11; the other end of the external locking pull plate 102 is an external pulling end, such as a second external pulling end 1021; an emergency operation lever 1022 for manually moving the central locking lever 51 to the upper or lower locking position is located on the external locking pull plate 102 near the fourth shaft 112. A second pull rod connecting block 1023 can be engaged with the second external pulling end 1021. The central locking lever 51 has an outwardly protruding side plate 5111 on one side. The side plate 5111 has a second elongated through hole 51111 that slides linearly along the fourth axis 112 to slide the central locking lever 51 to the upper or lower locking position. Outside the second elongated through hole 51111, there is a third elongated through hole 517 parallel to the second elongated through hole 51111, used by the emergency lever 10212 to move the central locking lever 51 to the upper or lower locking position. The external emergency locking and unlocking structure can also include: a push-pull rod fixed to one end of the central locking lever, passing through a hole in the support end plate; the external lever can be moved to move the central locking lever to the upper or lower locking position; or a steel wire rope can be attached to each end of the central locking lever, with the external lever pulling one end to unlock and the other end to lock.

[0092] See Figure 4 , Figure 5 , Figure 7 and Figure 12The central locking rod 51 is located in the upper safety position. In layman's terms, if the central locking rod 51 slides to the left, it will cause the coupling rod 91 to slide to the left as well. Or, in other words, the coupling rod 91 slides to the left along with the central locking rod 51. One end of the central locking rod 51 is located at a predetermined position at the left end of the support 11, and the actuating end 811 of the release plate 81 is located at a position that is offset from the free end 916 of the coupling rod 91 and cannot actuate the coupling rod 91.

[0093] See Figure 4 , Figure 5 , Figure 7 and Figure 12 The central locking lever 51 is in the unlocked position. In simple terms, if the central locking lever 51 slides to the right at one end, it will cause the coupling lever 91 to slide to the right at the same end. Or, in other words, the coupling lever 91 slides to the right along with the central locking lever 51. The other end of the central locking lever 51, if the right end is located at a predetermined position at the other end of the support 11, and the actuating end 811 of the release plate 81 is located at a position that overlaps laterally with the free end 916 of the coupling lever 91 and can actuate the coupling lever 91.

[0094] The central locking rod 51 can also be called a central locking plate, or an intermediate locking rod, or a frame-type locking component extending along the length of the support, or a frame-type locking plate. The electrical pin socket 101 can also be called an electrical pin assembly. The elongated through hole can also be called a waist-shaped through hole. A double-ended worm gear without self-locking function can also be called a double-ended worm gear without self-locking function, or a non-self-locking double-ended worm gear. Rotational fit, also called rotational connection, generally refers to the movement of the respective shafts through holes. The emergency operation groove 5110 can also be called an emergency operation port or an emergency operation notch. The first outer pulling end 711 can also be directly connected to the pull cable without the first pull rod connecting block 714; the second outer pulling end 1021 can also be directly connected to the pull cable without the second pull rod connecting block 1023. The outer locking pull plate 102 is also called an outer locking connecting rod. Shafts such as the first shaft 112, the second shaft 113, the third shaft 114, the fourth shaft 112, the pawl shaft 31, and the clamping plate shaft 21, etc., can be injection molded as a whole and fixed to the support 11 or the front cover 131. The actuating end 811 of the release plate 81 is misaligned or separated from the coupling rod 91, meaning they are in a position where they cannot be actuated. The free end 916 of the coupling rod 91, also called the actuating end of the coupling rod 91, may have an arc-shaped actuating block 9161 near the support 11 for actuating the pawl linkage block 33. The actuating end 811 of the release plate 81 and the coupling rod overlap laterally, also called horizontal overlap or horizontal coincidence, meaning they are in a position where they can be actuated. Engaging the safety mechanism is also called locking, and disengaging the safety mechanism is also called unlocking. Actuating connection can also be understood as the two forming actuating connection, meaning the relationship between them is one of actuation and being actuated. Linear motion is also called linear movement. An insurance structure can also be called an insurance institution, and an insurance dissolution structure can also be called an insurance dissolution institution.

[0095] Figure 4 , Figure 5 , Figure 7 and Figure 12 The working principle of the preferred embodiment of the automotive side door lock of the present invention is as follows:

[0096] 1. Electric locking: The motor 41 starts and rotates clockwise, driving the worm gear 43 to rotate counterclockwise. The central locking rod 51 slides to the left until it is limited to the predetermined left position or the maximum left position by the pins at both ends of the support 11, such as the first pin 111 and the second pin 1011. The central locking rod limiting torsion spring 52 limits the central locking rod 51 to the upper locking position. At this time, the central locking rod 51 is in the upper locking position, that is, the actuating end 811 of the release plate 81 is located at a position that is offset from the free end 916 of the coupling rod 91 and cannot actuate the coupling rod 91.

[0097] 2. Electric unlocking: The motor 41 starts and rotates counterclockwise, driving the worm gear 43 to rotate clockwise. This causes the central locking rod 51 to slide to the right until it is limited to a predetermined position or maximum position to the right by the first pin 111 and the second pin 1011 at both ends of the support 11. The central locking rod limiting torsion spring 52 limits the central locking rod 51 to the unlocked position. At this time, the central locking rod 51 is in the unlocked position, that is, the actuating end 811 of the release plate 81 is in a position that overlaps laterally with the free end 916 of the coupling rod 91 and can actuate the coupling rod 91.

[0098] 3. Internal manual emergency locking: Insert a screwdriver or other tool into the emergency operation groove 5110 and manually move it to the left to slide the central locking rod 51 to the left until it is limited to the predetermined left position or the maximum left position by the pins at both ends of the support 11, such as the first pin 111 and the second pin 1011. The central locking rod limiting torsion spring 52 limits the central locking rod 51 to the upper locking position. At this time, the central locking rod is in the upper locking position, that is, the actuating end 811 of the release plate 81 is located at a position that is offset from the free end 916 of the coupling rod 91 and cannot actuate the coupling rod 91.

[0099] IV. Internal manual emergency release of the safety device: Insert a screwdriver or other tool into the emergency operation groove 5110 and manually move it to the right, or pull the inner pull plate 61 to make the push claw 613 push the inner emergency release block 514 on the central locking rod 51, so that the central locking rod 51 slides to the right until it is limited to the predetermined position to the right or the maximum position to the right by the first pin 111 and the second pin 1011 at both ends of the support 11. The central locking rod limiting torsion spring 52 limits the central locking rod 51 to the release position. At this time, the central locking rod 51 is in the release position, that is, the release plate 81's actuating end 811 is located in a position that overlaps laterally with the free end 916 of the coupling rod 91 and can actuate the coupling rod 91.

[0100] 5. External manual emergency locking: Manually move the outer locking plate 102 to the left to drive the central locking rod 51 to slide to the left until it is limited to the predetermined left position or the maximum left position by the pins at both ends of the support 11, such as the first pin 111 and the second pin 1011. The central locking rod limiting torsion spring 52 limits the central locking rod 51 to the upper locking position. At this time, the central locking rod 51 is in the upper locking position, that is, the actuating end 811 of the release plate 81 is located at a position that is offset from the free end 916 of the coupling rod 91 and cannot actuate the coupling rod 91.

[0101] VI. External manual emergency release of the safety lock: Manually move the outer locking plate 102 to the right to drive the central locking rod 51 to slide to the right until the first pin 111 and the second pin 1011 at both ends of the support are limited to the predetermined position to the right, or the maximum position to the right. The central locking rod limiting torsion spring 52 limits the central locking rod 51 to the release position. At this time, the central locking rod 51 is in the release position, that is, the actuating end 811 of the release plate 81 is located in a position that overlaps laterally with the free end 916 of the coupling rod 91 and can actuate the coupling rod 91.

[0102] VII. 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 916 of the coupling rod 91 to rotate counterclockwise around the axis of the cylindrical portion 911. At this time, the coupling rod 91 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 91 causes the free end 916 of the coupling rod 91 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 92 resets the coupling rod 91, and the pawl linkage plate return torsion spring 34 resets the pawl linkage plate 33 and the pawl 32.

[0103] 8. 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 916 of the coupling rod 91 to rotate counterclockwise around the axis of the cylindrical portion 911. At this time, the coupling rod 91 and the unlocking anti-reverse structure on the central locking lever 51 are in arc-shaped sliding engagement, thus... To prevent unlocking abnormalities caused by the retraction of the coupling rod 91 during the unlocking process, the free end 916 of the coupling rod 91 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 92 resets the coupling rod 91, and the pawl linkage plate return torsion spring 34 resets the pawl linkage plate 33 and the pawl 32.

[0104] 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.

[0105] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. 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, a pawl rotatably engaged with the support via a pawl shaft, a motor, a worm gear on the motor shaft, and a worm wheel meshing with the worm gear; characterized in that: A central locking rod is slidably fitted on a support, and the support and the central locking rod have elastic structures that limit the central locking rod to the upper safety position or 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 engage with the locking plate to lock or disengage 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 worm gear is a double-headed worm gear without self-locking function. The worm wheel and the central locking rod have a toggle structure where the motor drives the worm wheel to rotate via the worm gear, thereby moving the central locking rod to the upper safety position or the unlocked position. It also includes an inner emergency locking and unlocking structure that allows manual adjustment of the central locking lever to either the locking or unlocking position. It also includes an outer emergency locking and unlocking structure that allows manual movement of the central locking lever to the locking or unlocking position. The central locking rod is in the upper safety 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 is offset from the free end of the coupling rod and cannot actuate the coupling rod. The central locking rod is positioned in the unlocked position as follows: the other end of the central locking rod is located at a predetermined position at the other 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 and can actuate the coupling rod.

2. The car side door lock according to claim 1, characterized in that: Each end of the support has a pin protruding from the surface of the central locking rod, and each end of the central locking rod has a first elongated through hole that slides along the pin in a straight line to slide the central locking rod to the upper locking position or the unlocked position.

3. The automotive side door lock according to claim 1, characterized in that: A pin and an elastic structure are indirectly mounted on the support near one end of the motor: an electrical pin socket is fixed on the support, the pin at that end is fixed on the electrical pin socket, the torsion spring body of a central locking rod limiting torsion spring is sleeved on the torsion spring post fixed to the electrical pin socket, one end of the central locking rod limiting torsion spring is engaged in the slot of the electrical pin socket, and the other end of the central locking rod limiting torsion spring is engaged in the first engaging groove at that end of the central locking rod that positions the central locking rod in the upper safety position or the second engaging groove that positions the central locking rod in the unlocked position.

4. The car 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 towards the support in the middle of the inner pull plate for moving the long strip plate part of the release plate. The other end of the inner pull plate has an inner emergency lever for pushing the central locking rod to drive the central locking rod to the unlock position for manual release of the safety. 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 sleeved on the first shaft. One end of the inner pull plate return torsion spring is engaged with the torsion spring hook at the end of the inner pull plate with the push claw. The other end of the inner pull plate return torsion spring is engaged with the front cover.

5. 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.

6. The automotive side door lock according to claim 4 or 5, 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.

7. The automotive 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.

8. The automotive side door lock according to claim 7, 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.

9. The automotive 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.

10. The car side door lock according to claim 1, characterized in that: The actuation structure on the worm gear and the central locking rod is as follows: the worm gear has a pin protruding towards the central locking rod, and the central locking rod has a pin groove for accommodating the pin.

11. The car side door lock according to claim 1, characterized in that: The central locking lever has an emergency operation groove for inserting a toggle tool to manually move the central locking lever to the upper safety position or the unlocked position. The support plate at the emergency operation groove has an elongated through hole for lateral toggle.

12. The car side door lock according to claim 1, characterized in that: One end of an outer locking pull plate is rotatably fitted onto a fourth shaft fixed on a support. The other end of the outer locking pull plate is an outer pulling end. Near the fourth shaft, there is an emergency operation lever for manually moving the central locking rod to the upper or lower safety position. On one side of the central locking rod, there is an outwardly protruding side plate. On the side plate, there is a second elongated through hole that slides linearly along the fourth shaft to move the central locking rod to the upper or lower safety position. Outside the second elongated through hole, there is a third elongated through hole that is parallel to the second elongated through hole and is used for the emergency lever to move the central locking rod to the upper or lower safety position.

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