Automobile back door lock

Abstract

The utility model discloses an automobile back door lock which comprises a lock body, a pawl, a motor, a worm, a gear and a lead screw. The spring is arranged between the pushing piece and the lock body, the pushing piece compresses the elastic piece to buffer impact when moving to the limiting position, and noise and structural damage are reduced. And the other end of the pushing piece is provided with a guide flange matched with the lock body guide plate, so that the linear motion precision is ensured. The lock body is provided with a strip-shaped positioning groove and a thickening ring corresponding to the end of the lead screw, and an elastic stop block is arranged in the lock body to compensate assembly errors. The gear improves stability through clearance fit of the rotating groove and rotation of the guide ring. The pull-in assembly comprises a pull-in rod, a tension spring and a stopping block with an arc-shaped face and a clamping groove, and smooth locking and self-locking of the pawl are achieved. The pull-in rod is additionally provided with a connecting column, a reinforcing plate and an anti-falling block fixing tension spring, and a protective sleeve and a hook body are arranged on the periphery of the pawl to reduce abrasion. The lock body is additionally provided with an emergency deflector rod and a microswitch, and manual unlocking and light linkage are supported.

Description

Technical Field

[0001] This utility model specifically relates to a car rear door lock. Background Technology

[0002] Car tailgate locks are used to lock and unlock the rear door of a car. Currently, most car tailgate locks on the market use an electric drive system, where a motor combined with a transmission mechanism engages and releases the latch. For example, Chinese invention patent application CN107191078A discloses an electric latching and unlocking car tailgate lock, including a lock body, latch, pawl, pawl release rod, latching lever assembly, motor, worm gear, and nut. The motor drives the worm gear to rotate the worm wheel, and the worm wheel screw drives the nut to move in the latching direction. The nut pushes the first latching lever, which, through a four-bar linkage, drives the second latching lever, causing the latch to gradually engage from the third locking position to the first locking position. After engagement, the nut returns to its initial position, and the motor stops when the nut reset switch detects the engagement.

[0003] However, the car door lock still has the following technical defects: when the nut moves to the limit position under the drive of the worm gear screw, it directly collides with the lock body housing or actuator housing, which not only causes structural damage, but also makes noise, and long-term use can reduce the life of the components. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a car door lock that addresses the shortcomings of the prior art by providing an elastic element on the side of the pusher, thereby solving the problems of structural damage caused by hard collision between the pusher and the lock body, excessive noise, and uneven rotation of the pawl due to inertial impact.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a car rear door lock, comprising a lock body, a pawl, and a drive mechanism. The lock body is provided with a lock groove, the pawl is distributed on one side of the lock groove and the middle part of the pawl is rotatably connected to the lock body, the drive mechanism includes a motor, a worm gear, and a gear, the worm gear is linked to the output end of the motor, the gear is rotatably installed in the lock body and meshes with the worm gear for transmission, the gear is linked to a lead screw, the lead screw is threadedly connected to a pusher, the pusher is linked to a suction assembly, the suction assembly is linked to the pawl, when the lead screw rotates, the pusher can move along the axial direction of the lead screw, the suction assembly drives the pawl to rotate, thereby blocking or opening the lock groove, characterized in that: the pusher is linked to an elastic element, one end of the elastic element is linked to the pusher and the other end abuts against the lock body.

[0006] By employing the above technical solution, the elastic element compresses and deforms when the pusher reaches its limit position, absorbing the impact kinetic energy, preventing direct contact between the pusher and the lock body, reducing noise, preventing lock body deformation, and protecting both the lock body and the pusher. Simultaneously, when the motor is operating, the elastic deformation of the elastic element slows down the instantaneous acceleration change of the pusher, suppressing the inertial impact of the gears and making the pawl rotate more smoothly.

[0007] The aforementioned car tailgate lock can be further configured such that: the elastic element is a spring, the end of the pushing element facing the spring is provided with a positioning post, one end of the spring is sleeved on the positioning post, and the other end of the spring abuts against the lock body.

[0008] By adopting the above technical solution and selecting a spring as the elastic element, not only is the cost low, but the appropriate spring stiffness can also be selected according to the actual pushing force required by the pawl. The positioning pin serves as the axial guide structure for the spring, ensuring that the spring compresses or extends only along a preset direction (the screw axis) when the pushing component moves, thus preventing the spring from bending or deviating laterally.

[0009] The aforementioned car tailgate lock can be further configured as follows: the middle part of the pusher is provided with a threaded hole that passes through the positioning post and the pusher; the pusher is threadedly connected to the lead screw through the threaded hole; the other end of the pusher is provided with a guide flange; the lock body is provided with a guide plate corresponding to the guide flange; the guide plate is arranged along the axial direction parallel to the lead screw.

[0010] Using the above technical solution, the guide flange, as a rigid extension of the pusher, slides with the guide plate to restrict the radial degree of freedom of the pusher. The pusher meshes with the lead screw through a threaded hole. When the gear rotates, the pusher can move linearly along the axis of the lead screw, thereby controlling the movement of the pawl.

[0011] The aforementioned car tailgate lock can be further configured as follows: the lock body has a strip-shaped positioning groove at the end corresponding to the lead screw, and the inner side of the lock body is also provided with a thickened ring surrounding the outer edge of the strip-shaped positioning groove. The end of the lead screw passes through the thickened ring until it is inserted into the strip-shaped positioning groove. An elastic stop block is provided inside the strip-shaped positioning groove that abuts against the end of the lead screw. The upper end of the elastic stop block is integrally formed with the lock body, and there is a gap between the side of the elastic stop block and the side wall of the strip-shaped positioning groove.

[0012] Using the above technical solution, the strip positioning groove is used for installation at the end of the lead screw. The thickened ring reduces the pressure of the lead screw end on the lock body by increasing the contact area, thus preventing the lock body from cracking due to axial force or impact of the lead screw. By setting an elastic stop, in addition to limiting the axial movement of the lead screw, it can also eliminate the influence of machining errors, accommodate minor alignment deviations between the lead screw end and the strip positioning groove, and facilitate the installation of the lead screw into the lock body.

[0013] The aforementioned car tailgate lock can be further configured as follows: the lock body is provided with a rotating groove that cooperates with the gear, a rotating guide ring is provided in the rotating groove, the gear is provided with a circular groove that cooperates with the rotating guide ring, a connecting rod is provided on the side of the rotating guide ring away from the gear, a positioning plate is fixed to the end of the connecting rod, the lock body is provided with a U-shaped mounting hole that cooperates with the connecting rod, and the lock body is also provided with a locking block that limits the upper end of the positioning plate.

[0014] Using the above technical solution, the rotating groove and gear are fitted with a clearance. Due to the rotation of the motor and gear, the lock body of the back door lock will reach a high temperature. The difference in the thermal expansion coefficients between the gear and the lock body can release stress through the clearance, preventing the gear from deforming due to expansion and compression. The rotating guide ring fits with the gear groove, improving the working stability of the gear and preventing radial deflection. The locking block limits the upper end of the positioning plate, and the connecting rod is located at the lower end of the U-shaped mounting hole under the gravity of the rotating guide ring, thus fixing the rotating guide ring. At the same time, the locking block can facilitate the disassembly of the rotating guide ring.

[0015] The aforementioned car tailgate lock can be further configured as follows: the suction assembly includes a suction rod and a tension spring. The suction rod is distributed on the other side of the lock groove and is opposite to the pawl. The upper end of the suction rod is hinged to the lock body. One end of the tension spring is linked to the middle of the suction rod. The lower end of the suction rod is provided with a linkage block that abuts against the guide flange. The other end of the tension spring is linked to the lower part of the pawl. The middle of the suction rod is also provided with a stop block protruding towards the pawl. The upper side of the stop block is provided with a first arc-shaped surface recessed towards the inside of the suction rod. The lower side of the stop block is provided with a first groove recessed towards the inside of the suction rod. The side of the pawl is provided with a locking block that can fit with the first groove when the pawl blocks the lock groove. The lower part of the locking block is provided with a second arc-shaped surface that can fit against the first arc-shaped surface when the pawl rotates. The first arc-shaped surface is connected to the second groove that can fit against the stop block when the pawl rotates to fully open the lock groove.

[0016] Using the above technical solution, the locking process is as follows: The motor drives the lead screw to rotate via a worm gear and gear. The guide plate and guide flange cooperate to restrict the rotation of the pusher. At the same time, the pusher pushes the linkage block through the guide flange. The linkage block pushes the suction rod to rotate around the hinge point (the hinge between the upper end of the suction rod and the lock body). The tension spring stretches and stores energy. Simultaneously, the tension spring pulls the pawl to rotate clockwise to seal the lock groove. The first slot of the stop block cooperates with the pawl's locking block. The pawl rotates under the tension of the tension spring to seal the lock groove. The locking block is embedded in the first slot, and the tension spring continuously provides pre-tightening force to prevent the pawl from reversing and ensure the lock groove is tightly closed. The opening process is as follows: The motor reverses, the pusher resets, the guide flange retracts, the linkage block releases the suction rod, the tension spring contracts, the locking block disengages from the first slot, and the first arc-shaped surface of the stop block contacts the second arc-shaped surface of the pawl. The pawl rotates counterclockwise under the guidance of the arc-shaped surface, fully opening the lock groove. The pawl rotates to the second slot to engage with the stop block to prevent accidental rebound. In summary, the latching assembly provided in this application mainly relies on a tension spring as the driving source for the swing and reset of the pawl. Compared with existing door locks, the number of parts is reduced, the cost is lowered, and it conforms to the concept of vehicle lightweighting.

[0017] The aforementioned car tailgate lock can be further configured as follows: a connecting post is fixed in the middle of the suction rod, and the two sides of the connecting post are fixedly connected to the suction rod by reinforcing plates respectively; one end of the tension spring is sleeved on the connecting post; an anti-detachment block is provided at the end of the connecting post away from the suction rod; a protective sleeve is fixed on the outer periphery of the pawl, and a hook is provided on the side of the protective sleeve; the other end of the tension spring is sleeved on the hook.

[0018] Using the above technical solution, the connecting post and hook body respectively link the tension spring with the suction rod and pawl. Reinforcing plates are installed on both sides of the connecting post to prevent deformation between the connecting post and the suction rod due to repeated stretching of the tension spring. Anti-slip blocks are installed to prevent the tension spring from slipping off the connecting post. A protective sleeve (usually made of plastic) is installed on the outside of the pawl to replace friction between the pawl and the locking tongue and suction rod, protecting the pawl.

[0019] The aforementioned car tailgate lock can be further configured such that: an emergency lever is also installed inside the lock body, the middle part of the emergency lever is hinged to the lock body, one end of the emergency lever extends to correspond to the lower end of the suction rod, and the lock body is provided with an opening corresponding to the other end of the emergency lever.

[0020] Using the above technical solution, in case of escape or motor damage, a person can manually move the emergency lever through the opening. The emergency lever pushes the suction rod, thereby controlling the rotation of the pawl and opening the lock groove.

[0021] The aforementioned car tailgate lock can be further configured such that a micro switch is also installed inside the lock body, and the micro switch is distributed in the lower middle part of the pawl.

[0022] Using the above technical solution, when the pawl rotates to open the lock groove, the pawl will simultaneously trigger the micro switch, thereby turning on the vehicle's rear trunk lights.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0026] Figure 3 This is an exploded view of the gear, lead screw, and other mechanisms in an embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the installation of the rotating guide ring and the lock body according to an embodiment of the present utility model;

[0028] Figure 5 for Figure 3 Enlarged view of a portion of point A in the middle;

[0029] Figure 6 This is a schematic diagram of the linkage between the pawl and the suction assembly in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the linkage between the pawl and the suction rod in an embodiment of the present invention.

[0031] Labeling notes: 1. Lock body, 2. Pawl, 3. Motor, 4. Worm gear, 5. Screw, 6. Pushing component, 7. Spring, 8. Positioning pin, 9. Guide flange, 10. Guide plate, 11. Strip positioning groove, 12. Thickened ring, 13. Elastic stop block, 14. Rotating groove, 15. Rotating guide ring, 16. Circular groove, 17. Hook, 18. Positioning plate, 19. U-shaped mounting hole, 20. Locking block, 21. Suction rod, 22. Tension spring, 23. Stopping block, 24. First arc surface, 25. First slot, 26. Locking block, 27. Second arc surface, 28. Second slot, 29. Connecting pin, 30. Reinforcing plate, 31. Anti-detachment block, 32. Emergency lever, 33. Micro switch, 34. Linkage block, 35. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] like Figures 1 to 7The car tailgate lock shown includes a lock body 1, a pawl 2, and a drive mechanism. The lock body 1 has a lock groove. The pawl 2 is located on one side of the lock groove and is rotatably connected to the lock body 1 at its center. The drive mechanism includes a motor 3, a worm gear 4, and a gear 5. The worm gear 4 is linked to the output end of the motor 3. The gear 5 is rotatably mounted inside the lock body 1 and meshes with the worm gear 4. The gear 5 is linked to a lead screw 6, which is threadedly connected to a pusher 7. The pusher 7 is linked to a suction assembly, which is linked to the pawl 2. When the lead screw 6 rotates, the pusher 7 can move axially along the lead screw 6. The suction assembly drives the pawl 2 to rotate, thereby blocking or opening the lock groove. The pusher 7 is linked to a spring 8. A positioning post 9 is provided at one end of the pusher 7 facing the spring 8. One end of the spring 8 is sleeved on the positioning post 9, and the other end of the spring 8 abuts against the lock body 1. Using spring 8 as the elastic element is not only cost-effective but also allows for the selection of a spring 8 with suitable stiffness based on the actual pushing force required by the pawl 2. The positioning pin 9 serves as the axial guide structure for the spring 8, ensuring that the spring 8 compresses or extends only along a preset direction (the axis of the lead screw 6) when the pusher 7 moves, preventing the spring 8 from bending or shifting laterally. When the pusher 7 moves to its limit position, the spring 8 compresses and deforms, absorbing impact energy, preventing direct contact between the pusher 7 and the lock body 1, reducing noise, preventing deformation of the lock body 1, and protecting both the lock body 1 and the pusher 7. Simultaneously, when the motor 3 is operating, the elastic deformation of the spring 8 slows down the instantaneous acceleration change of the pusher 7, suppressing the inertial impact of the gear 5, and making the pawl 2 rotate more smoothly.

[0034] The pusher 7 has a threaded hole in its middle, through which the positioning pin 9 passes and the pusher 7 is threadedly connected to the lead screw 6. The other end of the pusher 7 has a guide flange 10, and the lock body 1 has a guide plate 11 corresponding to the guide flange 10. The guide plate 11 is arranged along the axial direction parallel to the lead screw 6. The guide flange 10, as a rigid extension of the pusher 7, slides with the guide plate 11 to restrict the radial degree of freedom of the pusher 7. The pusher 7 meshes with the lead screw 6 through the threaded hole. When the gear 5 rotates, the pusher 7 can move linearly along the axis of the lead screw 6, thereby controlling the movement of the pawl 2.

[0035] The lock body 1 has a strip-shaped positioning groove 12 corresponding to the end of the lead screw 6. A thickened ring 13 surrounds the outer edge of the strip-shaped positioning groove 12 on the inner side of the lock body 1. The end of the lead screw 6 passes through the thickened ring 13 until it is inserted into the strip-shaped positioning groove 12. An elastic stop 14 is provided inside the strip-shaped positioning groove 12, abutting against the end of the lead screw 6. The upper end of the elastic stop 14 is integrally formed with the lock body 1, and there is a gap between the side of the elastic stop 14 and the side wall of the strip-shaped positioning groove 12. The strip-shaped positioning groove 12 is used for mounting the end of the lead screw 6. The thickened ring 13 reduces the pressure of the end of the lead screw 6 on the lock body 1 by increasing the contact area, preventing the lock body 1 from cracking due to axial force or impact of the lead screw 6. By setting the elastic stop 14, in addition to limiting the axial movement of the lead screw 6, it can also eliminate the influence of machining errors, accommodate minor alignment deviations between the end of the lead screw 6 and the strip-shaped positioning groove 12, and facilitate the installation of the lead screw 6 into the lock body 1.

[0036] The lock body 1 has a rotating groove 15 that fits with the gear 5 with a clearance. A rotating guide ring 16 is installed within the rotating groove 15. The gear 5 has a circular groove 17 that fits with the rotating guide ring 16. A connecting rod is installed on the side of the rotating guide ring 16 away from the gear 5. A positioning plate 19 is fixed to the end of the connecting rod. The lock body 1 has a U-shaped mounting hole 20 that fits with the connecting rod. The lock body 1 also has a locking block 21 that limits the upper end of the positioning plate 19. The rotating groove 15 fits with the gear 5 with a clearance. Due to the rotation of the motor 3 and the gear 5, the lock body 1 of the back door lock will experience high temperatures. The difference in thermal expansion coefficients between the gear 5 and the lock body 1 can release stress through the clearance, preventing the gear 5 from deforming due to expansion and compression. The rotating guide ring 16 fits with the circular groove 17 of the gear 5, improving the working stability of the gear 5 and preventing radial deflection. The locking block 21 limits the upper end of the positioning plate 19, and the connecting rod is located at the lower end of the U-shaped mounting hole 20 under the gravity of the rotating guide ring 16, thereby fixing the rotating guide ring 16. At the same time, the locking block 21 can also facilitate the disassembly of the rotating guide ring 16.

[0037] The suction assembly includes a suction rod 22 and a tension spring 23. The suction rod 22 is located on the other side of the lock groove and is positioned opposite to the pawl 2. The upper end of the suction rod 22 is hinged to the lock body 1. One end of the tension spring 23 is linked to the middle of the suction rod 22. The lower end of the suction rod 22 is provided with a linkage block 35 that abuts against the guide flange 10. The other end of the tension spring 23 is linked to the lower part of the pawl 2. The middle of the suction rod 22 is also provided with a stop block 24 that protrudes toward the pawl 2. The upper side of the stop block 24 is provided with a stop block 24 that protrudes toward the pawl 2. A first arc-shaped surface 25 is recessed inward towards the inner side of the suction rod 22. A first groove 26 recessed inward towards the inner side of the stop block 24 is provided on the lower side of the suction rod 22. A latching block 27 is provided on the side of the pawl 2, which can fit into the first groove 26 when the pawl 2 blocks the lock groove. Below the latching block 27 is a second arc-shaped surface 28 that can fit against the first arc-shaped surface 25 when the pawl 2 rotates. The first arc-shaped surface 25 is connected to a second groove 29 that can fit into the stop block 24 when the pawl 2 rotates to fully open the lock groove. The suction assembly mainly relies on the tension spring 23 as the driving source for the swing and reset of the pawl 2. Compared with existing rear door locks, this reduces the number of parts, lowers costs, and conforms to the concept of vehicle lightweighting.

[0038] A connecting post 30 is fixed to the middle of the suction rod 22. The two sides of the connecting post 30 are fixedly connected to the suction rod 22 via reinforcing plates 31. One end of the tension spring 23 is sleeved on the connecting post 30, and an anti-detachment block 32 is provided at the end of the connecting post 30 away from the suction rod 22. A protective sleeve is fixed to the outer periphery of the pawl 2, and a hook 18 is provided on the side of the protective sleeve. The other end of the tension spring 23 is sleeved on the hook 18. The connecting post 30 and the hook 18 respectively link the tension spring 23 with the suction rod 22 and the pawl 2. Reinforcing plates 31 are provided on both sides of the connecting post 30 to prevent deformation between the connecting post 30 and the suction rod 22 due to repeated stretching of the tension spring 23. The anti-detachment block 32 prevents the tension spring 23 from slipping out of the connecting post 30. A protective sleeve (usually made of plastic) is provided on the outside of the pawl 2 to replace the friction between the pawl 2 and the latch and suction rod 22, protecting the pawl 2.

[0039] An emergency lever 33 is also installed inside the lock body 1. The middle part of the emergency lever 33 is hinged to the lock body 1, and one end of the emergency lever 33 extends to correspond to the lower end of the suction rod 22. The lock body 1 has an opening at the other end corresponding to the emergency lever 33. In case of escape or damage to the motor 3, the emergency lever 33 can be manually activated through the opening. The emergency lever 33 pushes the suction rod 22, thereby controlling the rotation of the pawl 2 and opening the lock groove.

[0040] A micro switch 34 is also installed inside the lock body 1, and the micro switch 34 is located in the lower middle part of the pawl 2. When the pawl 2 rotates to open the lock groove, the pawl 2 will simultaneously touch the micro switch 34, thereby turning on the vehicle's trunk lights.

[0041] The working principle of this embodiment is as follows:

[0042] Locking process: Motor 3 drives lead screw 6 to rotate via worm gear 4 and gear 5. Guide plate 11 and guide flange 10 cooperate to restrict the rotation of pusher 7. At the same time, pusher 7 pushes linkage block 35 via guide flange 10. Linkage block 35 pushes suction rod 22 to rotate around hinge point (the hinge point between the upper end of suction rod 22 and lock body 1). Tension spring 23 stretches and stores energy. At the same time, tension spring 23 pulls pawl 2 to rotate clockwise to seal the lock groove. The first slot 26 of stop block 24 cooperates with the locking block 27 of pawl 2. Pawl 2 rotates under the tension of tension spring 23 to seal the lock groove. Among them, locking block 27 is embedded in the first slot 26. Tension spring 23 continuously provides preload to prevent pawl 2 from reversing and ensure the lock groove is tightly closed.

[0043] Opening process: Motor 3 reverses, pusher 7 resets, guide flange 10 retracts, linkage block 35 releases suction rod 22, tension spring 23 retracts, locking block 27 disengages from first slot 26, first arc-shaped surface 25 of stop block 24 contacts second arc-shaped surface 28 of pawl 2, pawl 2 rotates counterclockwise guided by the arc-shaped surface, pawl 2 fully opens the lock slot. Simultaneously, pawl 2 will trigger micro switch 34, thereby turning on the vehicle's rear trunk lights. Pawl 2 rotates to engage with second slot 29 and stop block 24 to prevent accidental rebound.

Claims

1. A car door lock, comprising a lock body, a pawl, and a drive mechanism, wherein the lock body has a lock groove, the pawl is distributed on one side of the lock groove and the middle of the pawl is rotatably connected to the lock body, the drive mechanism includes a motor, a worm gear, and a gear, the worm gear is linked to the output end of the motor, the gear is rotatably mounted in the lock body and meshes with the worm gear for transmission, the gear is linked to a lead screw, the lead screw is threadedly connected to a pusher, the pusher is linked to a suction assembly, the suction assembly is linked to the pawl, when the lead screw rotates, the pusher can move along the axial direction of the lead screw, and the suction assembly drives the pawl to rotate, thereby blocking or opening the lock groove, characterized in that: The pusher is linked to an elastic element, one end of which is linked to the pusher and the other end rests against the lock body.

2. The car rear door lock according to claim 1, characterized in that: The elastic element is a spring, and the end of the pusher facing the spring is provided with a positioning post. One end of the spring is sleeved on the positioning post, and the other end of the spring abuts against the lock body.

3. The car rear door lock according to claim 2, characterized in that: The pusher has a threaded hole in the middle that passes through the positioning post and the pusher. The pusher is threadedly connected to the lead screw through the threaded hole. The other end of the pusher has a guide flange. The lock body has a guide plate corresponding to the guide flange. The guide plate is arranged along the axial direction parallel to the lead screw.

4. The car rear door lock according to any one of claims 1 to 3, characterized in that: The lock body has a strip-shaped positioning groove at the end of the lead screw. The inner side of the lock body is also provided with a thickened ring surrounding the outer edge of the strip-shaped positioning groove. The end of the lead screw passes through the thickened ring until it is inserted into the strip-shaped positioning groove. An elastic stop block is provided inside the strip-shaped positioning groove, which abuts against the end of the lead screw. The upper end of the elastic stop block is integrally formed with the lock body. There is a gap between the side of the elastic stop block and the side wall of the strip-shaped positioning groove.

5. The car rear door lock according to claim 4, characterized in that: The lock body is provided with a rotating groove that fits with the gear. A rotating guide ring is provided in the rotating groove. The gear is provided with a circular groove that fits with the rotating guide ring. A connecting rod is provided on the side of the rotating guide ring away from the gear. A positioning plate is fixed to the end of the connecting rod. The lock body is provided with a U-shaped mounting hole that fits with the connecting rod. The lock body is also provided with a locking block that limits the upper end of the positioning plate.

6. The car rear door lock according to claim 3, characterized in that: The suction assembly includes a suction rod and a tension spring. The suction rod is located on the other side of the lock groove and is positioned opposite to the pawl. The upper end of the suction rod is hinged to the lock body. One end of the tension spring is linked to the middle of the suction rod. The lower end of the suction rod is provided with a linkage block that abuts against the guide flange. The other end of the tension spring is linked to the lower part of the pawl. The middle of the suction rod is also provided with a stop block that protrudes towards the pawl. The upper side of the stop block is provided with a first arc-shaped surface that is recessed towards the inside of the suction rod. The lower side of the stop block is provided with a first groove that is recessed towards the inside of the suction rod. The side of the pawl is provided with a locking block that can fit into the first groove when the pawl blocks the lock groove. Below the locking block is a second arc-shaped surface that can fit against the first arc-shaped surface when the pawl rotates. The first arc-shaped surface is connected to the second groove that can fit into the stop block when the pawl rotates to fully open the lock groove.

7. The car rear door lock according to claim 6, characterized in that: A connecting post is fixed in the middle of the suction rod. The two sides of the connecting post are fixedly connected to the suction rod by reinforcing plates. One end of the tension spring is sleeved on the connecting post. An anti-detachment block is provided at the end of the connecting post away from the suction rod. A protective sleeve is fixed on the outer periphery of the pawl. A hook is provided on the side of the protective sleeve. The other end of the tension spring is sleeved on the hook.

8. The car rear door lock according to claim 6, characterized in that: An emergency lever is also installed inside the lock body. The middle part of the emergency lever is hinged to the lock body. One end of the emergency lever extends to correspond to the lower end of the suction rod. The lock body has an opening corresponding to the other end of the emergency lever.

9. The car rear door lock according to claim 6, characterized in that: The lock body is also equipped with a micro switch, which is located in the lower middle part of the pawl.

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