Double-pull hood lock

Abstract

The double-pull hood lock comprises a lock shell, a clamping plate and a latch hook, the middle of the clamping plate and the middle of the latch hook are rotationally connected to the lock shell, first reset pieces for driving the clamping plate and the latch hook to rotate and reset are arranged at the rotating connecting positions, a clamping groove is formed in the clamping plate, a clamping part used for being clamped with the clamping groove is arranged on the latch hook, and an opening arm is rotationally connected to the lock shell. The latch hook is provided with a pushing part pushed by the opening arm, the opening arm is hinged to a linkage arm, the latch hook is provided with an avoiding groove for avoiding the linkage arm, the hinged position of the opening arm is provided with a second reset piece for driving the opening arm to rotate and reset, and when the opening arm is unlocked for the first time, the end of the linkage arm is located in the avoiding groove; the linkage arm abuts against the pushing part under the action of the second reset piece to drive the latch hook to rotate for secondary unlocking, the latch hook and the clamping plate collide to generate sound only in the semi-locking state and the full-unlocking state in the whole unlocking process, the number of times of the collision sound during unlocking and the number of times of vibration of the hood are effectively reduced, and the use experience feeling of people is improved.

Description

Technical Field

[0001] This invention relates to the field of machine cover locks, and in particular to a double-pull machine cover lock. Background Technology

[0002] The hood lock (also known as the engine hood lock) is a special locking system installed on the engine hood and front body of a car. Its core is a double locking structure and it is a key component for vehicle passive safety.

[0003] Hood locks are categorized into single-pull and double-pull types. Currently, the mainstream type used in automobiles is the double-pull hood lock, which unlocks the hood by pulling the handle twice. Existing double-pull hood locks mainly consist of a lock housing, a stop pawl, and a locking plate. During the unlocking process, an unlocking impact sound is generated when the hood is fully locked to the intermittent lock state. Another unlocking impact sound is generated when the stop pawl is released to the half-lock state. Pulling the stop pawl again to unlock from the half-lock to the fully open state generates another unlocking impact sound. The problem is that there are many impact sounds during the unlocking process, and the hood vibrates during each impact, which significantly affects the user experience and requires further improvement and refinement. Summary of the Invention

[0004] In order to reduce the number of impact sounds and vibrations of the machine cover when unlocking, this application provides a double-pull machine cover lock.

[0005] This application provides a double-pull machine cover lock, which adopts the following technical solution: A double-pull cover lock includes a lock shell, a locking plate, and a latch hook. The locking plate and the latch hook are rotatably connected to the lock shell at their middle parts, and each rotatable connection is provided with a first reset member to drive them to rotate and reset. The locking plate has a locking groove, and the latch hook has a locking part for locking into the locking groove. An opening arm is rotatably connected to the lock shell. The latch hook has a pushing part that is pushed by the opening arm. The opening arm is hinged to a linkage arm. The latch hook has a clearance groove to avoid the linkage arm. A second reset member is provided at the hinge of the opening arm to drive it to rotate and reset. When the opening arm unlocks for the first time, the end of the linkage arm is located in the clearance groove. When the opening arm unlocks for the second time, the linkage arm abuts against the pushing part under the action of the second reset member, driving the latch hook to rotate for a second unlocking.

[0006] Optionally, the locking slot includes a first locking slot and a second locking slot. When the locking part is locked with the first locking slot, it corresponds to a half-locked state. When the locking part is locked with the second locking slot, it corresponds to a fully locked state. In the fully locked state, the end of the linkage arm is located in the clearance slot and is offset from the pushing part.

[0007] Optionally, the opening arm is provided with a limiting groove, and the lock housing is provided with a limiting post. The limiting post is located in the limiting groove and is used to limit the travel angle of the opening arm.

[0008] Optionally, the opening arm is connected to a third reset member that drives it to rotate and reset, and the linkage arm extends to a drive end. When the opening arm rotates and resets, the drive end abuts against the limit post to drive the end of the linkage arm toward the clearance groove.

[0009] Optionally, the rotation center of the opening arm is concentric with the rotation center of the latch hook, and the rotation center of the opening arm has a central post rotatably connected to the lock housing, the central post passing through the latch hook.

[0010] Optionally, the pushing part has an inclined guide on the side near the clearance groove.

[0011] Optionally, the end of the opening arm away from the rotation center is connected to an unlocking cable, the end of the unlocking cable has a ball, the opening arm has a groove, the diameter of the ball is larger than the width of the groove, and the third reset component includes a tension spring, one end of which is connected to the opening arm and the other end is connected to the lock housing.

[0012] Optionally, the limiting post is detachably connected to the lock housing, and a rigid outer sleeve is fitted onto the limiting post.

[0013] Optionally, the outer wall of the latch is covered with a shell, and the shell has a cutout at the corresponding snap-fit ​​part, wherein the surface of the latch is flush with the surface of the shell at the cutout part.

[0014] Optionally, the first reset component includes a first torsion spring, the second reset component includes a second torsion spring, one end of the second torsion spring is connected to the opening arm, and the other end is connected to the linkage arm. An inductive switch is provided inside the lock housing, and the card plate has an abutment portion for abutting the inductive switch.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. When the opening arm rotates once to unlock, the end of the linkage arm is offset from the push part and located in the clearance groove. At this time, the opening arm directly contacts the push part to drive the latch hook to rotate for the first unlock. When the opening arm rotates twice to unlock, the end of the linkage arm abuts against the push part to drive the latch hook to rotate for the second unlock. During the entire unlocking process, the latch hook and the card plate only collide and produce sound when the latch hook is in the half-locked state and the fully open state. This effectively reduces the number of impact sounds and vibrations of the machine cover during unlocking, thus improving the user experience. 2. The design of the limiting post can effectively limit the rotation angle of the opening arm to avoid excessive rotation of the opening arm. On the other hand, the limiting post can also reset the state of the linkage arm. When the opening arm is reset, the drive end abuts against the limiting post to drive the end of the linkage arm toward the clearance groove, avoiding interference between the linkage part and the latch hook during the locking process, thus realizing the multi-purpose of the limiting post. 3. The concentric setting of the rotation center of the opening arm and the rotation center of the latch hook makes the overall structure more compact. The design of the guide part allows the end of the linkage arm to switch more smoothly from the avoidance groove to abut against the push part. Attached Figure Description

[0016] Figure 1 This is a perspective view of Example 1.

[0017] Figure 2 This is a front view of Example 1.

[0018] Figure 3 This is a perspective view of the hidden opening arm in Embodiment 1.

[0019] Figure 4 This is a front view of Embodiment 1 in a half-locked state.

[0020] Figure 5 This is a front view of Example 1 in its fully open state.

[0021] Figure 6 This is a front view of Example 2.

[0022] Explanation of reference numerals in the attached figures: 1. Lock housing; 2. Lock plate; 3. Latch hook; 4. First torsion spring; 5. Locking part; 6. First locking groove; 7. Second locking groove; 8. Locking buckle; 9. Entry groove; 10. Receiving groove; 11. Opening arm; 12. Center post; 13. Pushing part; 14. Push block; 15. Unlocking cable; 16. Linkage arm; 17. Pushing end; 18. Clearance groove; 19. Second torsion spring; 20. Tension spring; 21. Limiting groove; 22. Limiting post; 23. Drive end; 24. Guide part; 25. Ball; 26. Wire groove; 27. Outer shell; 28. Hollowed-out part; 29. ​​Discharge hole; 30. Baffle; 31. Linkage rod; 32. Return spring; 33. Handheld part; 34. Induction switch; 35. Abutment part. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0024] Example 1, a double-pull machine cover lock, such as Figures 1-3As shown, the lock includes a lock housing 1, a locking plate 2, and a latch hook 3. The locking plate 2 and the latch hook 3 are rotatably connected to the lock housing 1 at their center. A first reset element, a first torsion spring 4, is provided at the rotatable connection point between the locking plate 2 and the latch hook 3 to drive them to rotate and reset. The locking plate 2 has a locking groove, and the latch hook 3 has a locking part 5 for engaging and limiting the locking with the locking groove. In this embodiment, the locking groove includes a first locking groove 6 and a second locking groove 7. When the locking part 5 engages with the first locking groove 6, the lock is in a half-locked state; when the locking part 5 engages with the second locking groove 7, the lock is in a fully locked state. The top of the lock housing 1 is vertically... The latch 8 is provided with an entry groove 9 for the latch 8 to enter. The latch plate 2 has a receiving groove 10 for receiving the latch 8. In actual use, when the cover is lowered, the latch 8 first enters the entry groove 9 of the lock housing 1, and then gradually enters the receiving groove 10 of the latch plate 2, driving the latch plate 2 to rotate counterclockwise. When the latch plate 2 rotates to the point where the first latching groove 6 corresponds to the latching part 5, the latch hook 3, under the action of the first torsion spring 4, drives the latching part 5 to engage in the first latching groove 6. The latch 8 continues to move down, driving the latch plate 2 to continue to rotate. When the latch plate 2 rotates to the point where the second latching groove 7 corresponds to the latching part 5, the latching part 5 engages in the second latching groove 7, realizing the fully locked state of the cover.

[0025] like Figures 1-3 As shown, an opening arm 11 is rotatably connected to the lock housing 1. The top end of the opening arm 11 is rotatably connected to the lock housing 1, and the bottom end of the opening arm 11 is the power end. In this embodiment, the rotation center of the opening arm 11 is concentrically set with the rotation center of the latch hook 3. At the rotation center of the opening arm 11, there is a central post 12 rotatably connected to the lock housing 1. The central post 12 passes through the latch hook 3, thus realizing the rotatable connection between the opening arm 11 and the latch hook 3 simultaneously. The overall structure is more compact and simpler. The opening arm 11 is located above the latch hook 3, and there is no rotational interference between the two.

[0026] like Figures 1-3 As shown, the bottom end of the latch hook 3 has a protruding pushing part 13 facing the opening arm 11, and the opening arm 11 has a corresponding push block 14 on the side facing the pushing part 13. A power source is provided at the power end of the opening arm 11. In this embodiment, the power source is an unlocking cable 15. When unlocking is required, the cable pulls the push block 14 of the opening arm 11 to rotate towards the pushing part 13. The push block 14 pushes the latch hook 3 to rotate clockwise, thereby causing the locking part 5 on the latch hook 3 to disengage from the second locking groove 7 and engage with the first locking groove 6 to achieve the first unlocking. At this time, the lock is in a half-locked state (see Figure 4 ).

[0027] like Figures 1-3As shown, a linkage arm 16 is rotatably connected to the opening arm 11. One end of the linkage arm 16 faces the latch hook 3 and serves as a pushing end 17. The latch hook 3 has a recessed relief groove 18 corresponding to the pushing end 17. During the first unlocking process, the pushing end 17 is positioned towards the relief groove 18, and at this time, the pushing end 17 will not contact the pushing part 13 of the latch hook 3. A second reset member is provided at the rotation point of the linkage arm 16 to drive it to rotate and reset. The second reset member includes a second torsion spring 19. One end of the second torsion spring 19 is connected to the opening arm 11, and the other end is connected to the linkage arm 16. The second torsion spring 19 is used to drive the linkage arm 16 to reset to the direction where the pushing end 17 faces the pushing part 13. A third reset member is provided on the lock housing 1 to drive the opening arm 11 to rotate and reset. The three-stage reset mechanism includes a tension spring 20, one end of which is connected to the opening arm 11, and the other end is connected to the lock housing 1. When the unlocking cable 15 is pulled to complete the first unlocking, the latch hook 3 is in a half-locked state. After the unlocking cable 15 is released, the opening arm 11 retracts and resets under the action of the tension spring 20. At this time, the linkage arm 16 rotates counterclockwise under the action of the second torsion spring 19 until the pushing end 17 faces the pushing part 13. Pulling the unlocking cable 15 again performs a second unlocking. The opening arm 11 rotates and, with the pushing end 17 on the linkage arm 16 abutting against the pushing part 13, drives the latch hook 3 to rotate further clockwise. The locking part 5 on the latch hook 3 disengages from the first locking groove 6. After the unlocking cable 15 is released, the latch hook 3 and the locking plate 2 reset to the fully open state of the lock under the action of the first torsion spring 4 (see...). Figure 5 ).

[0028] When the opening arm 11 rotates once to unlock, the pushing end 17 of the linkage arm 16 is offset from the pushing part 13 and located in the clearance groove 18. At this time, the opening arm 11 directly contacts the pushing part 13 to drive the latch hook 3 to rotate for the first unlocking. When the opening arm 11 rotates a second time to unlock, the end of the linkage arm 16 abuts against the pushing part 13 to drive the latch hook 3 to rotate for the second unlocking. During the entire unlocking process, the latch hook 3 only impacts the locking plate 2 and produces sound when it is in the half-locked and fully open states. This effectively reduces the number of impact sounds and vibrations of the machine cover during unlocking, thus improving the user experience.

[0029] like Figures 1-3 As shown, a limiting groove 21 is provided on the side of the opening arm 11 facing away from the latch hook 3, and a limiting post 22 is detachably connected to the lock housing 1. The limiting post 22 is located in the limiting groove 21 and is used to limit the travel angle of the opening arm 11.

[0030] like Figures 1-3As shown, a drive end 23 extends from the linkage arm 16. When the unlocking cable 15 is released and the opening arm 11 is reset, the drive end 23 abuts against the limiting post 22, driving the pushing end 17 of the linkage arm 16 toward the clearance groove 18. The design of the limiting post 22 can effectively limit the rotation angle of the opening arm 11 to avoid excessive rotation of the opening arm 11. On the other hand, the limiting post 22 can also reset the state of the linkage arm 16. When the opening arm 11 is reset, the drive end 23 abuts against the limiting post 22, driving the end of the linkage arm 16 toward the clearance groove 18, avoiding interference between the linkage arm 16 and the latch hook 3 during the locking process, thus realizing the multi-purpose of the limiting post 22.

[0031] like Figures 1-3 As shown, the pusher 13 has an inclined guide 24 on the side near the clearance groove 18. The design of the guide 24 allows the end of the linkage arm 16 to switch more smoothly from the clearance groove 18 to abut against the pusher 13.

[0032] like Figure 1 As shown, the unlocking cable 15 is detachably connected to the opening arm 11. A ball 25 is fixed at the end of the unlocking cable 15, and a groove 26 is provided on the opening arm 11. One side of the groove 26 is through-hole. The diameter of the ball 25 is larger than the width of the groove 26. In this way, during the actual assembly and disassembly process, the unlocking cable 15 can be inserted into the groove 26 from one side, which is simple and convenient.

[0033] like Figures 1-3 As shown, in this embodiment, the limiting post 22 and the lock housing 1 are connected by a plug-in method to achieve a detachable connection. In other embodiments, the limiting post 22 can also be fixed by a threaded connection with the lock housing 1, and a hard outer sleeve is fitted on the outside of the limiting post 22. The hard outer sleeve can be a plastic sleeve, which avoids direct impact between the limiting post 22 and other components. When wear occurs after long-term use, only the plastic sleeve needs to be replaced. Even if the limiting post 22 is damaged, it can be replaced separately, avoiding unnecessary waste caused by replacing the entire lock housing 1.

[0034] like Figures 1-3 As shown, a housing 27 is fitted over the latch hook 3. The housing 27 has a cutout 28 corresponding to the snap-fit ​​part 5. The surface of the latch hook 3 at the cutout 28 is flush with the surface of the housing 27. The latch hook 3 is made of metal, while the housing 27 can be made of plastic. This ensures that when the snap-fit ​​part 5 snaps into the snap-fit ​​plate 2, the internal latch hook 3 directly abuts against the snap-fit ​​plate 2, ensuring the rigidity and structural strength of the snap-fit. On the other hand, it reduces the area of ​​direct contact, thereby reducing the noise generated during impact.

[0035] like Figures 1-3As shown, an induction switch 34 is provided inside the lock housing 1, and the card plate 2 has an abutting part 35 for abutting the induction switch 34. When the card plate 2 rotates to different states, the induction switch 34 can promptly sense the state of the card plate 35 and output a signal, so that people can know the current state of the card plate 2 in a timely manner.

[0036] The working principle of this embodiment is as follows: When unlocking, the first pull of the unlocking cable 15 drives the opening arm 11 to rotate. The push block 14 on the opening arm 11 pushes the latch hook 3 to rotate, causing the locking part 5 to disengage from the second locking groove 7. The locking plate 2 rotates clockwise under the action of the first torsion spring 4. After the locking plate 2 rotates to the first locking groove 6 and engages with the locking part 5, the unlocking cable 15 is released and rotates back to its original position under the action of the tension spring 20. The second pull of the unlocking cable 15 causes the linkage arm 16 to move its pushing end 17 toward the pushing part 13 of the latch hook 3 under the action of the second torsion spring 19. At this time, the rotation of the opening arm 11 further pushes the latch hook 3 to rotate by pushing the pushing part 13 with the help of the pushing end 17, so that the locking part 5 disengages from the first locking groove 6, completing the entire unlocking action.

[0037] Example 2, a double-pull machine cover lock, such as Figure 6 As shown, the main difference between this embodiment and Embodiment 1 lies in the structure of the lock housing 1. In this embodiment, the bottom of the lock housing 1 is provided with a discharge hole 29, and a baffle 30 for closing the discharge hole 29 is horizontally slidably connected to the lock housing 1. A linkage rod 31 is provided between the ball 25 and the baffle 30 to link the two. One end of the linkage rod 31 is connected to the ball 25, and the other end is connected to the baffle 30. The ends of the linkage rod 31 and the tension spring 20 are staggered to avoid interference. In this way, each time the unlocking cable 15 is pulled to unlock, the baffle can be driven simultaneously. The baffle 30 moves, which automatically opens the baffle 30. This allows impurities or moisture inside the lock to be effectively discharged through the discharge hole 29, preventing long-term accumulation inside. The discharge hole 29 is automatically opened and closed. When the cover is not open, the baffle 30 always closes the discharge hole 29 to prevent external impurities or moisture from entering the lock housing 1 through the discharge hole 29. In other embodiments, the bottom inner wall of the lock housing 1 can be designed to be inclined towards the discharge hole 29, which further facilitates the discharge of impurities and moisture through the discharge hole 29.

[0038] like Figure 6As shown, a return spring 32 is provided between the lock housing 1 and the baffle 30 to connect the two. One end of the return spring 32 is fixed to the baffle 30, and the other end is fixed to the lock housing 1. When the baffle 30 is in the state of closing the discharge hole 29, the return spring 32 is in the stretched state, and the tension of the return spring 32 is less than the tension of the tension spring 20. In this way, when the unlocking cable 15 is initially pulled, the initial tension can be smaller under the action of the return spring 32, making it easier to pull the unlocking cable 15 initially. After the unlocking cable 15 is released, the opening arm 11 resets. The tension of the return spring 32 can buffer the opening arm 11, reduce the impact force between the opening arm 11 and the limiting post 22 during the reset process, provide good protection for the limiting post 22, extend the service life of the limiting post 22, and realize the multi-purpose of the return spring 32.

[0039] In this embodiment, the linkage rod 31 is columnar with one end threaded to the ball 25 and the other end connected to the baffle 30, making the linkage rod 31 detachable. During assembly and disassembly, simply rotating the linkage rod 31 is sufficient to connect or disconnect it from the baffle 30, making the operation simple and convenient. Moreover, the linkage rod 31 can further limit the position of the ball 25, further preventing the unlocking cable 15 from coming off the opening arm 11, thus realizing the multi-purpose function of the linkage rod 31. To facilitate the rotation of the linkage rod 31, a hexagonal prism-shaped handle 33 is provided in the middle of the linkage rod 31, making it easier to hold and rotate the linkage rod 31 for assembly and disassembly.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A double-pull machine cover lock, characterized in that: The lock includes a lock housing (1), a locking plate (2), and a latch hook (3). The locking plate (2) and the latch hook (3) are rotatably connected to the lock housing (1) at their center, and each rotatable connection is provided with a first reset member to drive it to rotate and reset. The locking plate (2) has a locking groove, and the latch hook (3) has a locking part (5) for locking into the locking groove. An opening arm (11) is rotatably connected to the lock housing (1). The latch hook (3) has a pushing part (13) that is pushed by the opening arm (11). 11) A linkage arm (16) is hinged. The latch hook (3) has a relief groove (18) to avoid the linkage arm (16). The hinge of the opening arm (11) is provided with a second reset member to drive it to rotate and reset. When the opening arm (11) unlocks once, the end of the linkage arm (16) is located in the relief groove (18). When the opening arm (11) unlocks a second time, the linkage arm (16) abuts against the pushing part (13) under the action of the second reset member to drive the latch hook (3) to rotate for a second unlock.

2. The double-pull machine cover lock according to claim 1, characterized in that: The latching groove includes a first latching groove (6) and a second latching groove (7). When the latching part (5) latches with the first latching groove (6), it corresponds to a half-locked state. When the latching part (5) latches with the second latching groove (7), it corresponds to a fully locked state. In the fully locked state, the end of the linkage arm (16) is located in the clearance groove (18) and is offset from the pushing part (13).

3. A double-pull machine cover lock according to claim 2, characterized in that: The opening arm (11) is provided with a limiting groove (21), and the lock housing (1) is provided with a limiting post (22). The limiting post (22) is located in the limiting groove (21) and is used to limit the travel angle of the opening arm (11).

4. A double-pull machine cover lock according to claim 3, characterized in that: The opening arm (11) is connected to a third reset member that drives it to rotate and reset. The linkage arm (16) extends a drive end (23). When the opening arm (11) rotates and resets, the drive end (23) abuts against the limiting post (22) and drives the end of the linkage arm (16) toward the clearance groove (18).

5. A double-pull machine cover lock according to claim 1, characterized in that: The rotation center of the opening arm (11) is concentric with the rotation center of the latch hook (3). The rotation center of the opening arm (11) has a central post (12) rotatably connected to the lock housing (1). The central post (12) passes through the latch hook (3).

6. A double-pull machine cover lock according to claim 1, characterized in that: The pusher (13) has an inclined guide (24) on the side near the clearance groove (18).

7. A double-pull machine cover lock according to claim 4, characterized in that: The opening arm (11) is connected to an unlocking cable (15) at one end away from the rotation center. The end of the unlocking cable (15) has a ball (25). The opening arm (11) has a groove (26). The diameter of the ball (25) is greater than the width of the groove (26). The third reset component includes a tension spring (20). One end of the tension spring (20) is connected to the opening arm (11), and the other end is connected to the lock housing (1).

8. A double-pull machine cover lock according to claim 3, characterized in that: The limiting post (22) is detachably connected to the lock shell (1), and a hard outer sleeve is fitted on the limiting post (22).

9. A double-pull machine cover lock according to claim 3, characterized in that: The outer wall of the latch (3) is covered with a shell (27), and the shell (27) has a hollow part (28) corresponding to the snap-fit ​​part (5). The surface of the latch (3) at the hollow part (28) is flush with the surface of the shell (27).

10. A double-pull machine cover lock according to claim 1, characterized in that: The first reset component includes a first torsion spring (4), the second reset component includes a second torsion spring (19), one end of the second torsion spring (19) is connected to the opening arm (11), and the other end is connected to the linkage arm (16). The lock housing (1) is provided with an induction switch (34), and the card plate (2) has an abutment part (35) for abutting the induction switch (34).

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