Double ratchet and pawl structure for automobile front hood lock
Through the design of the double ratchet pawl structure and locking block, the problem of manual intervention in the traditional front hood lock is solved, and automatic locking and unlocking under electric control is realized, reducing the cost of use.
Patent Information
- Application Number
- CN202510301757.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2025-06-06
AI Technical Summary
The traditional car front hood lock requires manual intervention when opening and closing, and the electric push and pull rod increases the cost of use, affecting the unlocking and automatically bounce.
The double ratchet pawl structure is adopted. The unloading ratchet is pushed through the locking block to overcome the torsion of the large torsion spring, so that it enters a half-locked state, and the torsion spring force is removed in advance. The locking is subsequently completed by the electric push and pull rod overcoming the torsion of the small torsion spring.
It realizes locking and unlocking of the front hood without manual intervention, reducing the cost of use and meeting the needs of electric control.
Smart Images
Figure CN120100264A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of locks, in particular to a double ratchet pawl structure for a front hood lock of an automobile. Background Art
[0002] At present, some electric vehicles have a front trunk space at the front of the vehicle, which is equipped with a front hood, and items can be placed inside. The opening and closing methods of the front hood are similar to those of the hood of a traditional gasoline vehicle, but it is more convenient to use. When opening, you only need to press a button inside the vehicle to unlock it through a motor drive, and the front hood automatically opens under the action of a push rod. When closing it, an electric push-pull rod must be designed, and the front hood can only be pulled down, and the lock cannot overcome the torque of the ratchet torsion spring on the lock. Therefore, external force must be used to press the front hood manually to successfully insert the lock into the front hood lock. The traditional method can only be achieved by reducing the torsion spring force and increasing the pulling force of the electric push-pull rod, but too low a torsion spring force will affect the automatic pop-up of the front hood when it is unlocked, and adding an electric push-pull rod will greatly increase the cost of use. Therefore, electric front hoods are not currently used in electric vehicles. Summary of the invention
[0003] In order to solve the above technical problems, the present invention provides a double ratchet pawl structure for a car front hood lock, which can remove the torsion spring force in advance before the lock buckle enters the lock, so that the lock buckle can be smoothly pulled in by the electric push-pull rod to complete the locking, meeting the electric control requirements.
[0004] The technical solution is as follows: a double ratchet pawl structure for a front hood lock of an automobile, comprising a ratchet mechanism and a pawl mechanism, characterized in that it also comprises a locking mechanism, wherein the ratchet mechanism comprises a main ratchet and a force-unloading ratchet, wherein the main ratchet is connected to a small torsion spring of the main ratchet, and the force-unloading ratchet is connected to a large torsion spring of the force-unloading ratchet, and the pawl mechanism comprises a main pawl matched with the main ratchet and a secondary pawl matched with the force-unloading ratchet, wherein the main pawl is connected to a main pawl torsion spring, and the secondary pawl is connected to a secondary pawl torsion spring, and the locking mechanism comprises a rotatable locking block, wherein the locking block is connected to a locking drive mechanism and is provided A main pushing block and a force unloading pushing block are provided which respectively cooperate with the main ratchet and the force unloading ratchet; locking process: before the lock buckle is locked, the locking block first pushes the force unloading ratchet to overcome the torsion of the large torsion spring of the force unloading ratchet and the torsion of the torsion spring of the auxiliary pawl and rotates to a semi-locked state cooperating with the auxiliary pawl; after the locking block is reset, the lock buckle is pressed down to make the main ratchet overcome the torsion of the small torsion spring of the main ratchet and the torsion of the torsion spring of the main pawl and rotate to a semi-locked state cooperating with the main pawl; the locking block then pushes the main ratchet to rotate and cooperate with the main pawl to make the lock buckle reach a fully locked state.
[0005] It is further characterized in that the main ratchet and the unloading ratchet are mounted on the same ratchet shaft, and the main pawl and the auxiliary pawl are mounted on the same pawl shaft; The main ratchet is provided with a first half-locking protrusion and a full-locking protrusion, the unloading ratchet is provided with a second half-locking protrusion, and the main pawl and the auxiliary pawl are both provided with a single locking block; The locking block is rotatably connected to the locking shaft; A first switch relay sensor is arranged beside the unloading ratchet, and a first trigger block cooperating with the first sensor is arranged on the unloading ratchet; a second switch relay sensor and a third switch relay sensor are arranged beside the main ratchet, and a second trigger block cooperating with the second switch relay sensor and the third switch relay sensor is arranged on the main ratchet; The main ratchet and the unloading ratchet are both provided with a shifting block on a side away from the pawl mechanism, and the main pushing block or the unloading pushing block pushes the shifting block to rotate the main ratchet or the unloading ratchet; The locking block is provided with a locking reset torsion spring.
[0006] After adopting the present invention, before the lock is locked, the unloading push block on the locking block is first used to push the unloading ratchet to overcome the torsion of the large torsion spring of the unloading ratchet, so that it cooperates with the auxiliary pawl to reach a semi-locked state, and the large torsion spring of the ratchet with large torque is deformed downward in advance, thereby realizing the unloading effect before locking. When the lock is pressed in, it only needs to overcome the torsion of the small torsion spring of the main ratchet with small torque. The lock can be directly pressed in by using components such as electric push-pull rods to make the main ratchet also enter a semi-locked state without manual intervention. Finally, the main push block on the locking block is used to continue to push the main ratchet to rotate, bringing the lock to the fully locked position, which can save the operation of manually closing the front hood and meet the needs of electric control. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 A schematic diagram of the external structure of a front hood lock using the present invention; Figure 3 for Figure 2 Schematic diagram of the internal structure; Figure 4 for Figure 3 Other viewing angles Figure 1 ; Figure 5 for Figure 3 Other viewing angles Figure 2 ; Figure 6 for Figure 3 The schematic diagram after the manual unlocking mechanism is omitted; Figure 7 for Figure 6 Back diagram; Figure 8 This is a schematic diagram of the installation locations of the three sensors; Fig. 9 Schematic diagram of the process of pushing the unloading ratchet wheel in preparation for the rotation of the locking block; Fig.10 It is a schematic diagram of the process of the force-releasing ratchet being pushed to the semi-locked position; Fig.11 It is a schematic diagram of the lock buckle pressing process and the locking and quick reset state; Fig.12 Schematic diagram of the process of pushing the main ratchet wheel in preparation for the rotation of the locking block; Fig.13 It is a schematic diagram of the process of the force-releasing ratchet being pushed to the fully locked position; Fig.14 Schematic diagram for resetting the locking block. DETAILED DESCRIPTION
[0008] See Figure 1-Figure 8 As shown, a double ratchet pawl structure for a front hood lock of an automobile comprises a ratchet mechanism and a pawl mechanism arranged in a lock housing 1, the ratchet mechanism comprises a main ratchet 3 and a force-unloading ratchet 4 mounted on the same ratchet shaft 2, the main ratchet 3 is connected to a small main ratchet torsion spring 5, the force-unloading ratchet 4 is connected to a large force-unloading ratchet torsion spring 6, the main ratchet 3 is provided with a locking groove 8 for accommodating a lock buckle 7, the pawl mechanism comprises a main pawl 10 mounted on the same pawl shaft 9 and cooperating with the main ratchet 3, a secondary pawl 11 cooperating with the force-unloading ratchet 4, the main pawl 10 is connected to the main pawl torsion spring 12, the secondary pawl 11 is connected to the secondary pawl torsion spring 13, a locking shaft 14 is arranged below the ratchet shaft 2, a rotatable locking block 15 is mounted on the locking shaft 14, the locking block 15 is connected to the locking driving mechanism, generally a motor drives the locking rod 16 to realize the rotation of the locking block 15, the locking block 15 is provided with a main push block 17 and a unloading push block 18 which cooperate with the main ratchet 3 and the unloading ratchet 4 respectively, the main push block 17 and the unloading push block 18 are arranged side by side and spaced apart, and the two are connected by a connecting rod 19.
[0009] The main ratchet 3 is provided with a first half-locking protrusion 3-1 and a full-locking protrusion 3-2, the unloading ratchet 4 is provided with a second half-locking protrusion 4-1, and the main pawl 10 and the auxiliary pawl 11 are provided with single locking blocks 10-1 and 11-1. The single locking block 10-1 of the main pawl 10 can cooperate with the first half-locking protrusion 3-1 and the full-locking protrusion 3-2 respectively to realize half-locking and full-locking locking states, and the single locking block 11-1 of the auxiliary pawl can realize a half-locking locking state with the second half-locking protrusion 4-1.
[0010] The main ratchet 3 and the unloading ratchet 4 are respectively provided with shifting blocks 3-3 and 4-2 on the side away from the pawl mechanism, and the main push block 17 or the unloading push block 18 pushes the shifting block 3-3 or the shifting block 4-2 to rotate the main ratchet 3 or the unloading ratchet 4. The locking block 15 is provided with a locking reset torsion spring 20.
[0011] See Figure 9-14As shown, the locking process is as follows: before the lock buckle 7 is locked, the motor drives the locking block 15 to rotate clockwise (from the front perspective), and the unloading push block 18 pushes the shifting block 4-2, allowing the unloading ratchet 4 to overcome the torsion of the unloading ratchet large torsion spring 6 and the torsion of the auxiliary pawl torsion spring 13 and rotate clockwise until the second half-locking protrusion 4-1 of the unloading ratchet 4 cooperates with the single locking block 11-1 of the auxiliary pawl 11 to abut and enter a semi-locked state; then, the motor drives the locking block 15 to rotate counterclockwise to reset, and the lock buckle 7 begins to press down and contact the main ratchet 3. As the lock buckle 7 continues to press down, the main ratchet 3 overcomes the torsion of the main ratchet small torsion spring 5 and the main ratchet torsion spring 12 The torque rotates clockwise until the first half-locking protrusion 3-1 of the main ratchet 3 cooperates and abuts with the single locking block 10-1 of the main pawl 10 to enter a half-locked state; finally, the motor drives the locking block 15 to rotate clockwise, and the main pushing block 17 pushes the shifting block 3-3, allowing the main ratchet 2 to continue to overcome the torsion of the small torsion spring 5 of the main ratchet and the torsion of the torsion spring 12 of the main pawl to rotate clockwise, the lock buckle 7 is pressed downward, and the force-unloading ratchet 4 continues to be pressed to rotate clockwise, until the full-locking protrusion 3-2 of the main ratchet 3 cooperates and abuts with the single locking block 10-1 of the main pawl 10 to enter a fully locked state, and the motor drives the locking block 15 to rotate counterclockwise to reset again.
[0012] In the above locking process, in addition to the initial manual pressing of the front hood closing button to give a start signal, the motor also requires two reset signals and one start signal. In order to achieve this smoothly, the following method is used: a first switch relay sensor 21 is arranged next to the unloading ratchet 4, and a first trigger block 4-3 cooperating with the first sensor is arranged on the unloading ratchet 4. A second switch relay sensor 22 and a third switch relay sensor 23 are arranged next to the main ratchet 3. The two are arranged side by side and spaced apart. A second trigger block 3-4 cooperating with the second switch relay sensor 22 and the third switch relay sensor 23 is arranged on the main ratchet 3; before locking, the main ratchet 3 and the unloading ratchet 4 are both in the open state, the first trigger block 4-3 presses the first switch relay sensor 21, and the second trigger block 3-4 presses the With the second switch relay sensor 22 and the third switch relay sensor 23, when locking begins, after pressing the front hood button inside the car, the motor starts to start and drives the locking block 15 to rotate clockwise. When the force unloading ratchet 4 rotates to the semi-locked position, the first trigger block 4-3 disengages from the first switch relay sensor 21. At this time, the motor receives a reset signal and starts to reset. When the lock buckle comes down and rotates the main ratchet 3 to the semi-locked position, the second trigger block 3-4 disengages from the second switch relay sensor 22 and still presses the third switch relay sensor 23. At this time, the motor receives a start signal and drives the locking block 15 to rotate clockwise again. Until the main ratchet 3 rotates to the fully locked position, the second trigger block 3-4 disengages from the third switch relay sensor 23. At this time, the motor receives a reset signal and starts the second reset.
[0013] The unlocking mechanism is introduced below, which is basically consistent with the existing unlocking principle.
[0014] An unlocking block 24 is rotatably mounted on the pawl shaft 9, and the unlocking block 24 is connected to an unlocking driving mechanism 25. The main pawl 10 and the auxiliary pawl 11 are both provided with unlocking bent pieces 10-2 and 11-2, and an unlocking push block 26 cooperating with the unlocking bent pieces 10-2 and 11-2 is provided on the unlocking block 24. The unlocking dial block 35 is rotatably connected to the unlocking shaft 29; an unlocking reset torsion spring 27 is provided on the unlocking block 24, and a limiting column 28 is provided on the side of the unlocking block 24 close to the ratchet structure; when unlocking, the unlocking driving mechanism 25 is a pull rod connected to the motor, which pulls the unlocking dial block 35 to rotate clockwise, and the unlocking push block 26 below pushes the unlocking bent pieces 10-2 and 11-2 to make the auxiliary pawl 11 and the main pawl 10 The main ratchet 3 rotates counterclockwise together under the action of the small torsion spring 5 of the main ratchet, and the unloading ratchet 4 also rotates counterclockwise under the action of the large torsion spring 6 of the unloading ratchet, and pushes the lock buckle 7 to lift up, and the unlocking block 35 is reset. At this time, the main ratchet 3 and the main pawl 10 are stuck, and the unloading ratchet 4 and the auxiliary pawl are stuck and enter a semi-locked state. Then the unlocking drive mechanism 25 pulls the unlocking block 35 to rotate clockwise again. At this time, the unlocking push block 26 above pushes the unlocking bent piece 10-2 to make the main ratchet 3 rotate counterclockwise again, and the unlocking push block 26 below pushes the unlocking bent piece 11-2 to make the unloading ratchet rotate counterclockwise again. The lock buckle is lifted by the unloading ratchet 4 and the main ratchet 3, completing the final unlocking.
[0015] During the locking process, if the motor of the locking drive mechanism fails and the locking cannot be continued, especially in the semi-locked state, the lock buckle is buckled and cannot be opened or locked. At this time, maintenance is required. The present application provides a manual unlocking mechanism, which is as follows: The unlocking shaft 29 is also rotatably mounted with a manual unlocking block 30, which is connected to the manual unlocking pull rod 31. One side of the manual unlocking block 30 is provided with a manual unlocking bent piece 32 that cooperates with the unlocking block 24, and the other side is hinged to one end of the manual transmission block 33. The middle part of the manual transmission block 33 is rotatably connected to the locking shaft 14, and the other end is provided with a reset push block 34 that cooperates with the main push block 17 and the unloading push block 18. 36 in the figure is a manual unlocking reset torsion spring; when the manual unlocking pull rod 31 is pulled, the manual unlocking block 30 rotates clockwise, pushing the unlocking dial block 35 to rotate clockwise, and then pushing the unlocking push block 26 to rotate for the unlocking operation. At the same time, the manual transmission block 33 rotates counterclockwise, and the reset push block 34 pushes the connecting rod 19, so that the main push block 17 and the unloading push block 18 can reset with the locking block 15, so that the main ratchet 3 and the unloading ratchet 4 can smoothly rotate counterclockwise to complete the unlocking operation, and the linkage unlocking can be completed through manual control.
Claims
1. A double ratchet and pawl structure for a front hood lock of an automobile, comprising a ratchet mechanism and a pawl mechanism, characterized in that: It also includes a locking mechanism, the ratchet mechanism includes a main ratchet and a force-unloading ratchet, the main ratchet is connected to a small torsion spring of the main ratchet, the force-unloading ratchet is connected to a large torsion spring of the force-unloading ratchet, the pawl mechanism includes a main pawl matched with the main ratchet, and a secondary pawl matched with the force-unloading ratchet, the main pawl is connected to a main pawl torsion spring, the secondary pawl is connected to a secondary pawl torsion spring, the locking mechanism includes a rotatable locking block, the locking block is connected to a locking drive mechanism and is provided with main push blocks respectively matched with the main ratchet and the force-unloading ratchet and a force-unloading push block; locking process: before the lock buckle is locked, the locking block first pushes the force-unloading ratchet to overcome the torsion of the large torsion spring of the force-unloading ratchet and the torsion of the torsion spring of the secondary pawl and rotates to a semi-locked state that cooperates with the secondary pawl; after the locking block is reset, the lock buckle is pressed down to make the main ratchet overcome the torsion of the small torsion spring of the main ratchet and the torsion of the torsion spring of the main pawl and rotate to a semi-locked state that cooperates with the main pawl; the locking block then pushes the main ratchet to rotate and cooperate with the main pawl to make the lock buckle reach a fully locked state.
2. A double ratchet pawl structure for a front hood lock of an automobile according to claim 1, characterized in that: The main ratchet and the unloading ratchet are mounted on the same ratchet shaft, and the main pawl and the auxiliary pawl are mounted on the same pawl shaft.
3. A double ratchet pawl structure for a front hood lock of an automobile according to claim 1, characterized in that: The main ratchet is provided with a first half-locking convex block and a full-locking convex block, the unloading ratchet is provided with a second half-locking convex block, and the main pawl and the auxiliary pawl are both provided with a single locking block.
4. A double ratchet pawl structure for a front hood lock of an automobile according to claim 1, characterized in that: The locking block is rotatably connected to the locking shaft.
5. The double ratchet pawl structure for a front hood lock of an automobile according to claim 1, characterized in that: A first switch relay sensor is arranged next to the unloading ratchet, and a first trigger block cooperating with the first sensor is arranged on the unloading ratchet. A second switch relay sensor and a third switch relay sensor are arranged next to the main ratchet, and a second trigger block cooperating with the second switch relay sensor and the third switch relay sensor is arranged on the main ratchet.
6. A double ratchet pawl structure for a front hood lock of an automobile according to claim 1, characterized in that: The main ratchet and the unloading ratchet are both provided with a shifting block on a side away from the pawl mechanism, and the main pushing block or the unloading pushing block pushes the shifting block to rotate the main ratchet or the unloading ratchet.
7. A double ratchet pawl structure for a front hood lock of an automobile according to claim 1, characterized in that: The locking block is provided with a locking reset torsion spring.