A double-pull hood lock with gravity self-locking function

Abstract

This invention discloses a double-pull hood lock with gravity self-locking function, relating to the field of automotive safety locks. It includes a base plate, a stop component, a locking plate, and a spring-loaded device. The locking plate and the stop component are rotatably mounted on the base plate and are driven by elastic elements to rotate in the unlocking and locking directions, respectively. The spring-loaded device has an upper limit position; after the bolt passes the upper limit position, it is no longer subject to elastic force. The locking plate has full lock, half lock, and self-weight stop positions. Maintaining the traditional double-pull unlocking operation, pulling the rope for the first time releases the full lock, and pulling the rope a second time releases the half lock and gravity self-locking. When locking, the bolt presses against the locking plate under the weight of the hood, and the stop pawl engages with the self-weight stop, achieving self-locking without overcoming spring-loaded force. This invention adds a gravity self-locking function without changing operating habits, effectively preventing the hood from accidentally springing open when not closed, thus improving driving safety.

Description

Technical Field

[0001] This application relates to the field of automotive parts, and in particular to a double-pull hood lock with gravity self-locking function. Background Technology

[0002] A vehicle hood lock is a vehicle lock used to lock and maintain the closed position of a car's hood.

[0003] If the hood accidentally pops up while the vehicle is in motion, it will severely obstruct the driver's view and could easily lead to a serious accident. Therefore, the hood lock must have reliable locking performance to prevent accidental opening when not in use. To ensure that the hood will not open accidentally during normal driving, for safety, the hood lock must have two locking positions: fully open, half-lock, and fully locked. When the operator first triggers the unlocking mechanism, the hood lock changes from fully locked to half-locked. Only a second trigger changes it from half-locked to fully open. In other words, two operations are required to fully open the hood. This design prevents the hood from being completely unlocked due to a single accidental touch while the vehicle is in motion, thus avoiding a dangerous situation.

[0004] Early hood locks required a two-stage unlocking process. The first unlocking involved pulling the unlocking cord from inside the driver's compartment, shifting the hood lock from fully locked to partially locked. Simultaneously, the hood would spring up 20mm due to the elasticity of a spring-loaded mechanism (such as a torsion spring or pneumatic spring). The second unlocking required the operator to move to the hood, reach into the gap, and activate the mechanical latch, simultaneously lifting the hood to complete the second unlocking from partially locked to fully open. During this process, the hood needed to be manually supported to prevent it from falling back into place due to its own weight. Therefore, the spring-loaded mechanism only needed to push the hood from fully locked to partially locked during the first unlocking; it did not function during the transition from partially locked to fully open. As the hood was slowly released from the fully open position, its own weight was sufficient to overcome the elasticity of the mechanical latch, allowing it to smoothly switch to the partially locked position, easily completing the locking action.

[0005] However, to improve ease of operation, a double-pull hood lock was later developed. This eliminates the need for personnel to get out of the vehicle and operate the hood; simply pulling the unlocking cord twice from inside the driver's seat switches the hood lock from fully locked to half-locked, and then from half-locked to fully open – a dual-lock unlocking mechanism. For this type of lock to unlock from inside the vehicle without anyone lifting the hood, the pop-up mechanism must have sufficient elasticity and travel to directly raise the hood to the fully open height. Compared to earlier designs, the pop-up mechanism of the double-pull hood lock not only needs to push the hood from fully locked to half-locked, but also needs to further pop it from half-locked to fully open; otherwise, the double-pull opening function from inside the vehicle cannot be achieved. However, this also presents a locking challenge: when the hood falls back from the fully open to the half-locked position, the elasticity of the pop-up mechanism must be overcome; the weight of the hood itself is insufficient to complete the half-lock. If the user does not close the hood firmly enough or forgets to close it, and the hood lock alarm is disabled or ignored, the hood will remain fully open and cannot enter the half-locked state by its own weight. At high speeds, it may be lifted up by airflow, posing a serious safety risk. Summary of the Invention

[0006] In order to overcome the aforementioned technical problems, and to enable the hood to lock under its own weight even if the user forgets to close it, thus preventing the hood from being fully open without manual locking, this invention provides a double-pull hood lock with gravity self-locking function.

[0007] A double-pull hood lock with gravity self-locking function includes a base plate, a stop component, a locking plate, and a pop-up device; The base plate is provided with a U-shaped locking groove, which is used to accommodate the locking tongue on the hood; the base plate is provided with a locking plate shaft and a stop shaft respectively, and the locking plate and the stop assembly are respectively mounted on the locking plate shaft and the stop shaft; The spring-loaded device is used to provide an upward spring force to the latch; the spring-loaded device can be implemented in various ways in the prior art, such as a spring-loaded spring, a spring-loaded gas spring, or a tension spring with a lever structure, and its specific implementation structure is not limited here; The stop assembly is provided with a stop elastic element; The stop assembly is provided with a stop pawl, and the clamping plate is provided with a self-weight stop position, a half-lock stop position and a full-lock stop position that are adapted to the stop pawl. The stop pawl and the stop position cooperate to lock the rotation position of the clamping plate. The pop-up device has an upper limit position that restricts upward movement. When the locking plate and the stop pawl are engaged in the self-weight stop position, the locking tongue is located above the upper limit position of the pop-up device.

[0008] Furthermore, the stop assembly includes an opening arm and a stop arm, and the lower end of the opening arm is provided with a rotating pawl; The stop pawl is mounted on the stop arm, and the stop arm is also provided with a backstop pawl that moves synchronously with the stop pawl. The card plate is provided with a first blocking block and a second blocking block in a misaligned layer with the stop. A clearance notch is provided between the first blocking block and the second blocking block. The rotating pawl includes a front pawl, a first rear pawl and a second rear pawl. The front pawl can engage with the first blocking block and the second blocking block and can enter the clearance notch. The first rear pawl and the second rear pawl can abut against the anti-reverse pawl.

[0009] Furthermore, it also includes a locking plate elastic element, which, under the action of the locking plate elastic element, tends to rotate in the unlocking direction.

[0010] Furthermore, the opening arm is provided with a rotating pawl limiting part, which is used to limit the extreme position of the rotating pawl rotation.

[0011] Furthermore, the lower end of the opening arm is provided with a connection point for connecting to an external pull rope, and the base plate is provided with a first limiting block and a second limiting block that limit the pulling range of the pull rope.

[0012] Furthermore, the card plate is provided with a ramp portion, and when the ramp portion and the stop pawl are on the same plane, the ramp portion is configured to engage with the stop pawl during the final stroke of unlocking.

[0013] Furthermore, the base plate is provided with a first limiting part of the stop arm, which is used to limit the extreme position of the stop arm rotating in the locking direction.

[0014] Furthermore, the substrate is provided with a second limiting part of the stop arm, which is used to limit the extreme position of the stop arm rotating in the opening direction.

[0015] Furthermore, the card plate is provided with a locking hook; the locking hook is used to cooperate with the U-shaped locking groove to lock the locking tongue on the hood; the end of the locking hook is configured to be pushed by the locking tongue when the hood is lifted during the unlocking process, thereby driving the card plate to rotate in the unlocking direction.

[0016] This approach has the following beneficial effects: It features a gravity-locked function: In addition to the traditional full lock and half lock, a gravity-lock position is added. Even if you forget to close the hood, or if the external force applied when closing the hood is insufficient for various reasons, the hood will still be in a gravity-locked state, effectively preventing the hood from accidentally popping up while driving and greatly improving driving safety.

[0017] This solution maintains the simple double-pull operation: continuing the traditional double-pull opening habit, even with the addition of a locking position, the unlocking process can still maintain the double-pull opening, without adding any new opening actions. Attached Figure Description

[0018] To facilitate the explanation of the working principle, some parts in the attached diagram are drawn with dashed lines to cover their outlines.

[0019] Figure 1 This is a schematic diagram of the overall structure of the lock body in an embodiment of the present invention; Figure 2 This is a lock body structure in an embodiment of the invention where the lock plate is hidden and the positional relationship with the lock tongue is shown; Figure 3 This is a first-view structural diagram of the card plate in an embodiment of the present invention; Figure 4 This is a schematic diagram of the card plate from a second perspective in an embodiment of the present invention; Figure 5 This is a schematic diagram of the lock body in a fully locked state in an embodiment of the present invention; Figure 6 This is a schematic diagram of the instantaneous state of the lock body when the opening arm is pulled for the first time in an embodiment of the present invention, before the locking plate has moved. Figure 7 This is a schematic diagram of the lock body entering a half-lock state in an embodiment of the present invention; Figure 8 This is a schematic diagram of the first release of the pull rope in this embodiment of the invention, which causes the opening arm to return to its initial position. Figure 9 This is a schematic diagram of the instantaneous state of the card plate before it moves when the opening arm is pulled for the second time in an embodiment of the present invention. Figure 10 This is a schematic diagram of the state at the moment when the front pawl and the second blocking block begin to abut against each other, while the opening arm is being pulled in this embodiment of the invention. Figure 11 This is a schematic diagram of the instant the spring reaches its upper limit position in an embodiment of the present invention; Figure 12 This is a schematic diagram of the state at the instant the hood is manually lifted and the clamp continues to rotate in an embodiment of the present invention; Figure 13 This is a schematic diagram of the lock body in a fully open state in an embodiment of the present invention; Figure 14 This is a schematic diagram of the lock body entering the self-weight locking position during the locking process in an embodiment of the present invention; Figure 15 This is a schematic diagram of the lock body entering a semi-locked position during the locking process in an embodiment of the present invention; Figure 16 This is a schematic diagram of the structure of the stop component in an embodiment of the present invention; The component names represented by each number in the attached diagram are as follows: 100. Base plate; 101. Bushing; 102. U-shaped locking groove; 103. Clamping plate shaft; 104. Stop shaft; 105. First limiting part of stop arm; 106. Second limiting part of stop arm; 107. First limiting block; 108. Second limiting block; 200. Stop assembly; 201. Stop arm torsion spring; 202. Opening arm; 203. Stop arm; 204. Rotating pawl; 205. Pull rope connection position; 206. Opening arm torsion spring; 207. Stop pawl; 208. Anti-reverse pawl; 209. Front pawl; 210. First rear pawl; 211. Second rear pawl; 212. Rotating pawl torsion spring; 213. Rotating pawl limiting part; 214. Limiting protrusion; 300. Clamping plate; 301. Clamping plate torsion spring; 302. Weight stop; 303. Half-lock stop; 304. Full-lock stop; 305. First blocking block; 306. Second blocking block; 307. Clearance notch; 308. Locking hook; 309. Slope section; 400. Spring; 500. Locking plate; 501. Spring-loaded limiting part; 600. Locking tongue. Detailed implementation method: The following is a detailed explanation of this solution with reference to the accompanying drawings. Please note that... Figures 5 to 15 All torsion springs except the spring-loaded spring have been hidden.

[0020] Please see Figure 1 , Figure 2 As shown, a double-pull hood lock with gravity self-locking function includes a base plate 100, a stop component 200, a locking plate 300, a spring 400, and a locking plate 500.

[0021] Two bushings 101 are riveted to the base plate 100, and the locking plate 500 is fixedly disposed at the other end of the bushings 101; the base plate 100 and the locking plate 500 are respectively provided with U-shaped locking grooves 102 for accommodating the locking tongue 600 of the hood.

[0022] The card plate 300 is rotatably mounted on the base plate 100 via the card plate shaft 103. Under the action of the card plate torsion spring 301, the card plate 300 tends to rotate in the unlocking direction.

[0023] The stop assembly 200 is rotatably mounted on the base plate 100 via the stop shaft 104. Under the action of the stop elastic element, the stop assembly 200 has a tendency to rotate in the locking direction. The stop elastic element is a general term and can be a single part or multiple parts. In this embodiment, the stop elastic element includes the opening arm torsion spring 206 and the stop arm torsion spring 201.

[0024] The spring 400 is sleeved on the bushing 101 on the side of the locking plate 300 and is located on the side of the U-shaped locking groove 102 to provide an upward spring force for the locking tongue 600.

[0025] The lock plate 500 is provided with a spring limiting part 501, which is used to limit the upper limit position of the spring 400 moving upward; after the latch 600 moves upward past the upper limit position, the spring 400 no longer applies an upward elastic force to the latch 600.

[0026] like Figure 16 As shown, Figure 16 In order to show the core components more clearly, some of the hidden lines that were covered have been removed. The stop assembly 200 includes an opening arm 202 and a stop arm 203. The lower end of the opening arm 202 is provided with a rotating claw 204.

[0027] The upper end of the opening arm 202 is rotatably sleeved on the stop shaft 104, and the pull rope connection position 205 is located at the lower end of the opening arm 202. The opening arm torsion spring 206 acts on the opening arm 202, causing it to maintain a tendency to return to the locking direction.

[0028] The upper end of the stop arm 203 is coaxially rotatably mounted on the stop shaft 104, and the stop pawl 207 is disposed on the stop arm 203. Under the action of the stop arm torsion spring 201, the stop arm 203 tends to rotate in the locking direction. The base plate 100 is provided with a first stop arm limiting part 105 to limit the extreme position of the stop arm 203 in the locking direction; a second stop arm limiting part 106 is also provided to limit the extreme position of the stop arm 203 in the unlocking direction. The second stop arm limiting part 106 is mainly to prevent the stop arm 203 from rotating too much in the unlocking direction due to excessive instantaneous impact force when the hood is quickly closed by external force, thereby preventing malfunction and improving stability.

[0029] The stop pawl 207 is disposed on the stop arm 203, and the stop arm 203 is also provided with a backstop pawl 208 that moves synchronously with the stop pawl 207. The clamping plate 300 is provided with a self-weight stop position 302, a half-lock stop position 303 and a full-lock stop position 304 that are adapted to the stop pawl 207. The stop pawl 207 cooperates with different stop positions to lock the rotation position of the clamping plate 300. The card plate 300 is provided with a first blocking block 305 and a second blocking block 306 at a misalignment with the stop. An avoidance notch 307 is provided between the first blocking block 305 and the second blocking block 306. The rotating pawl 204 includes a front pawl 209 that can engage with the first blocking block 305 and the second blocking block 306 and can enter the avoidance notch 307, and a first rear pawl 210 and a second rear pawl 211 that can abut against the anti-reverse pawl 208.

[0030] like Figure 3 , Figure 4 As shown, the locking plate 300 has a double-layer integrated structure, integrating a locking hook 308, a full-lock stop 304, a half-lock stop 303, a gravity stop 302, a first blocking block 305, and a second blocking block 306. In this example, the full-lock stop 304, half-lock stop 303, and gravity stop 302 are located on the first layer, while the first blocking block 305 and the second blocking block 306 are located on the second layer. The full-lock stop 304, half-lock stop 303, and gravity stop 302 cooperate with the stop pawl 207 to achieve three levels of limiting: full lock, half lock, and gravity self-locking.

[0031] The locking hook 308 engages with the U-shaped locking groove 102 to lock the locking tongue 600.

[0032] When the end of the lock hook 308 is configured to be pushed by the lock tongue 600 when the cover is lifted to unlock, the auxiliary plate 300 rotates in the unlocking direction.

[0033] In the gravity self-locking state, when the locking plate 300 and the stop component 200 are engaged in the self-weight stop position 302, the locking tongue 600 is located above the upper limit position of the spring 400. That is, when entering this locking position, the spring 400 is not touched at all. The hood can be locked by its own weight alone, without having to overcome the spring force of the spring 400, thus achieving the function of locking by gravity.

[0034] During the unlocking process, the opening arm 202 drives the rotating pawl 204 to rotate, and the first rear pawl 210 pushes the anti-reverse pawl 208 to deflect, realizing the switch from a fully locked state to a half-locked state. The second rear pawl 211 pushes the anti-reverse pawl 208 to switch from a half-locked state to a fully open state. At the same time, during the unlocking process, the front pawl 209 of the rotating pawl 204 abuts against the second blocking block 306 of the locking plate 300, preventing the stop pawl 207 in the stop arm 203 from cooperating with the self-weight stop 302 of the locking plate 300. This ensures that during the double-pull opening process, the self-weight stop 302 is passed, preventing the lock body from entering the self-weight stop 302 during the unlocking process.

[0035] During the locking process, the hood's own weight drives the locking plate 300 to rotate and enter the self-weight stop position 302 via the locking tongue 600. Then, under the action of the closing operation's external force, the locking tongue 600 overcomes the spring force of the spring 400 and moves downward, synchronously driving the locking plate 300 to rotate and enter the half-lock position. Under the action of the closing operation's external force, the locking tongue 600 continues to overcome the spring force of the spring 400 and moves downward, synchronously driving the locking plate 300 to rotate and enter the fully locked position. Before the locking plate 300 enters the fully locked position, the first blocking block 305 on the locking plate 300 drives the rotating pawl 204 to rotate, causing the second rear pawl 211 of the rotating pawl 204 to disengage from the blocking relationship with the anti-reverse pawl 208 on the stop arm 203, so as to ensure that the second rear pawl 211 does not interfere with the movement of the stop pawl 207 in the reset direction.

[0036] The following detailed steps, with reference to the accompanying diagrams, illustrate the specific unlocking and locking processes: Please see Figures 5 to 15 As shown, The unlocking process is explained in detail below: Figure 5 The diagram shows the fully locked state. At this time, the latch 600 is constrained in the fully locked position by the latch hook 308 and the U-shaped lock groove 102. The stop pawl 207 is engaged with the fully locked stop 304 on the plate 300. The front pawl 209 of the rotating pawl 204 is located in the clearance notch 307 between the first blocking block 305 and the second blocking block 306 on the plate 300. The front pawl 209 abuts against the first blocking block 305, constraining the posture of the rotating pawl 204, causing its first rear pawl 210 to be raised, preventing the first rear pawl 210 from obstructing the reset of the stop arm 203. The spring 400 abuts against the lower part of the latch 600, providing an upward elastic force to the latch 600.

[0037] Then, pull the unlocking cord, as follows: Figure 6 As shown, the pull rope drives the opening arm 202 to rotate in the unlocking direction. In the figure, it swings clockwise around the stop shaft 104. During this process, the opening arm 202 pushes the stop arm 203's anti-reverse pawl 208 via the first rear pawl 210 of the rotating pawl 204, causing the stop arm 203 to rotate clockwise synchronously until the stop pawl 207 disengages from the full locking position 304 on the locking plate 300. With the further pull of the pull rope, the opening arm 202 can continue to swing until it touches the first limit block 107 on the base plate 100, reaching the maximum swing angle.

[0038] Since the stop pawl 207 disengages from the fully locked stop 304 on the latch plate 300, the stop pawl 207 no longer obstructs the rotation of the latch plate 300. Under the action of the spring 400, the latch tongue 600 moves upward along the U-shaped locking groove 102. Since the latch tongue 600 is still in the locking hook 308 of the latch plate 300, the upward movement of the latch tongue 600 will synchronously drive the latch plate 300 to rotate in the unlocking direction (clockwise for the latch plate 300 in this example). Because the latch plate 300 is mainly rotated by the force of the spring 400 acting through the latch tongue 600 during this process, the latch plate torsion spring 301 is optional. In this embodiment, a latch plate torsion spring is provided. 301. In addition to being pushed by the locking tongue 600, the locking plate 300 is also driven by the locking plate torsion spring 301 to rotate in the unlocking direction until the stop pawl 207 touches the half-lock stop 303 on the locking plate 300. The locking plate 300 and the stop pawl 207 cooperate to enter the half-lock state, completing the first unlocking operation. At the same time, due to the rotation of the locking plate 300, the first blocking block 305 also disengages from the front pawl 209 of the rotating pawl 204. Under the action of the rotating pawl torsion spring 212, the rotating pawl 204 rotates counterclockwise around the axis until the lower edge of the second rear pawl 211 of the rotating pawl 204 abuts against the upper edge of the anti-reverse pawl 208. Figure 7 As shown.

[0039] Then, the unlocking cord is released, and the opening arm 202 retracts to its initial position under the action of the opening arm torsion spring 206. The opening arm 202 then rests against the second limiting block 108 on the base plate 100. Figure 8 As shown. During the retraction of the opening arm 202 to the initial position, because the stop pawl 207 is constrained by the half-lock stop 303 on the plate 300, the stop arm 203 can only remain in the half-lock position and cannot return to the initial position with the opening arm 202. Therefore, during the retraction of the opening arm 202, the first rear pawl 210 of the rotating pawl 204 will disengage from the stop pawl 208 on the stop arm 203. Furthermore, as the opening arm 202 retracts, the lower edge of the second rear pawl 211 of the rotating pawl 204 will also disengage from the stop pawl 208. Subsequently, the rotating pawl 204 rotates counterclockwise around its axis under the action of the rotating pawl torsion spring 212 until the limiting protrusion 214 on the rotating pawl 204 abuts against the rotating pawl limiting part 213 on the opening arm 202, thus achieving the desired result. Figure 8 The state shown is that the second rear pawl 211 and the anti-reverse pawl 208 are in the same horizontal direction.

[0040] Then, pull the rope a second time, as... Figure 9As shown, the opening arm 202 once again drives the stop arm 203 to rotate in the unlocking direction (clockwise). Unlike the first time when the pull rope is pulled, this time the second rear pawl 211 pushes the anti-reverse pawl 208, thereby driving the stop arm 203 to rotate synchronously. The second rear pawl 211 is longer than the first rear pawl 210. Therefore, while the opening arm 202 can only rotate to the first limit block 107, the stop arm 203 can rotate at a greater angle under the push of the second rear pawl 211 than it can under the push of the first rear pawl 210. This allows the stop pawl 207 to disengage from the half-lock stop 303. The locking plate 300 loses the constraint of the stop pawl 207 again. The locking tongue 600 continues to rise under the action of the spring 400. The locking plate 300 continues to rotate in the unlocking direction under the combined action of the locking plate torsion spring 301 and the spring 400.

[0041] After the stop pawl 207 disengages from the semi-locking position 303, and the pull rope is released, as follows: Figure 10 As shown, the stop pawl 207 will engage with the outer surface of the locking plate 300, preventing the stop arm 203 from resetting to its initial position under the action of the stop arm torsion spring 201. During the continued rotation of the locking plate 300, before the stop pawl 207 enters the self-weight stop position 302, the front pawl 209 on the rotating pawl 204 has already engaged with the outer surface of the second blocking block 306 on the locking plate 300. The second rear pawl 211 of the rotating pawl 204 remains in contact with the anti-reverse pawl 208, thus preventing the stop arm 203 from resetting to its initial position under the action of the stop arm torsion spring 201. Therefore, even if the locking plate 300 rotates further in the unlocking direction, and the stop pawl 207 disengages from the locking plate 300, the stop pawl 207 cannot enter the self-weight stop position 302, preventing it from being locked in the self-weight stop position 302 during the unlocking process. That is, during the unlocking process, the stop pawl 207 passes over the self-weight stop 302 on the card plate 300.

[0042] Subsequently, as Figure 11 As shown, the latch 600 continues to rise under the action of the spring 400, and the locking plate 300 continues to rotate in the unlocking direction under the combined action of the locking plate torsion spring 301 and the spring 400, until the spring 400 touches the spring limiting part 501 on the locking plate 500. Figure 11 (Not shown in the image) The spring 400 is limited and no longer provides upward elastic force to the locking tongue 600. At this time, the front pawl 209 on the rotating pawl 204 still abuts and engages with the outer surface of the second blocking block 306 on the locking plate 300, continuously preventing the stop arm 203 from returning to its initial position under the action of the stop arm torsion spring 201, and the stop pawl 207 still cannot enter the self-weight stop position 302.

[0043] Then, during the process of manually lifting the hood, such as Figure 12As shown, at this time, the latch 600 is still constrained by the latch 308 and the U-shaped lock groove 102, and the locking plate 300 is not constrained by the stop pawl 207. Therefore, the hood can be easily lifted manually, thereby disengaging the latch 600 from the U-shaped lock groove 102, and the hood is fully unlocked. Figure 13 As shown in the diagram. During the manual lifting of the hood, the latch 600 will push the latch hook 308 on the latch plate 300, causing the latch plate 300 to rotate further in the unlocking direction. After the latch 600 and the latch hook 308 are completely disengaged, the latch plate 300 continues to rotate in the unlocking direction (clockwise) under the action of the latch plate torsion spring 301, to ensure that the latch hook 308 is completely disengaged from the U-shaped lock groove 102, and to prevent the latch 600 from hitting the outer peripheral surface of the latch hook 308 when locking, thus preventing it from locking.

[0044] In this example, setting the plate torsion spring 301 is the optimal solution. However, even without setting the plate torsion spring 301, the plate 300 can still be driven to continue rotating clockwise after it is completely disengaged from the latch 600. Specifically: when the latch 600... Figure 12 As shown, the movement continues upward, causing the clamping plate 300 to rotate a small angle further. The front pawl 209 of the rotating claw 204 will then disengage from the second blocking block 306. Subsequently, the stop arm 203 returns to its initial position under the action of the stop arm torsion spring 201. Figure 13 As shown, the stop pawl 207 engages with the ramp portion 309 on the locking plate 300. The force of the stop arm torsion spring 201 driving the stop arm 203 to reset generates a component force in the ramp portion 309 that drives the locking plate 300 to rotate clockwise. This allows the locking plate 300 to continue rotating clockwise even without the locking plate torsion spring 301, so as to completely avoid the U-shaped locking groove 102.

[0045] The locking process is explained in detail below: Figure 13 The diagram shows the hood in a fully open state, which is also the initial state in which it begins to lock under its own gravity. At the instant shown in the diagram, the latch 600 just begins to contact the first blocking block 305 on the latch plate 300. At this moment, the second blocking block 306 is separated from the front pawl 209, and the opening arm 202 is in the initial position. The hood latch 600 applies the weight of the hood to the first stop block 305, driving the locking plate 300 to rotate in the locking direction (counterclockwise). Since the latch 600 only needs to overcome the component forces generated by the locking plate torsion spring 301 and the stop arm torsion spring 201 via the stop pawl 207 and the ramp 309, and these two forces are very small relative to the weight of the hood (orders of magnitude difference), the hood's weight can easily drive the latch 600 downwards. During the downward movement, the stop pawl 207, under the action of the stop arm torsion spring 201, continuously engages with the ramp 309 on the locking plate 300 until it engages with the weight stop 302 on the locking plate 300. Figure 14 As shown, the latch 300 can no longer rotate in the unlocking direction (i.e., clockwise). At this time, even if the hood is not fully closed, it can maintain the lock by its own weight and will not accidentally pop open. During this process, the second blocking block 306 collides with the front pawl 209 of the rotating pawl 204, causing the rotating pawl 204 to rotate clockwise by a certain angle, so that the second rear pawl 211 and the anti-reverse pawl 208 disengage from the horizontally abutting posture, clearing the obstruction for the subsequent anti-reverse pawl 208 to further reset to the initial position.

[0046] To further switch the hood lock to the half-lock state, it is necessary to manually apply downward pressure to the hood, causing the latch 600 to overcome the spring force of the spring 400. The latch 600 continues to descend, driving the locking plate 300 to continue rotating in the locking direction. During the downward movement of the latch 600 and the counterclockwise rotation of the locking plate 300, the second blocking block 306 continues to engage with the front pawl 209, forcing the rotating pawl 204 to continue rotating clockwise, thereby placing the first rear pawl 210 in the position where it does not interfere with the reset of the anti-reverse pawl 208. As the locking plate 300 rotates further, the stop pawl 207 will engage in the half-lock stop position 303. Figure 15 As shown.

[0047] When the hood is pressed down further, the latch 600 continues to move downward against the spring force of the spring 400, and the locking plate 300 continues to rotate counterclockwise in the locking direction. The front pawl 209 disengages from the second blocking block 306 and enters the clearance notch 307. However, due to the constraint of the first blocking block 305, the rotating pawl 204 cannot return to its initial position (the initial position of the rotating pawl 204 is when the limiting protrusion 214 abuts against the limiting part 213 of the rotating pawl). The second rear pawl 211 remains in a position that does not hinder the return of the anti-reverse pawl 208 until the stop pawl 207 engages in the full locking position 304. Figure 15 As shown, the hood is now fully locked.

[0048] In summary, this approach has the following beneficial effects: It features a gravity self-locking function: In addition to the traditional full lock and half lock, a new gravity stop position 302 is added. Even if you forget to close the hood, or if the external force applied when closing the hood is insufficient for various reasons, the hood will still be in a gravity-locked state, effectively preventing the hood from accidentally popping up while driving and greatly improving driving safety.

[0049] This solution maintains the simple double-pull operation: continuing the traditional double-pull opening habit, even with the addition of a locking position, the unlocking process can still maintain the double-pull opening, without adding any new opening actions.

[0050] Miniaturization: The 300 pallet adopts a double-layer structure and a multi-functional rotating claw 204, resulting in fewer parts, smaller size, and lower cost.

[0051] The above is a detailed description of an embodiment of a double-pull hood lock with gravity-based self-locking function according to the present invention, and is not intended to limit the present invention. Those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A double-pull hood lock with gravity self-locking function, comprising a base plate (100), a stop assembly (200), a locking plate (300), and a pop-up device; The base plate (100) is provided with a U-shaped locking groove (102), which is used to accommodate the locking tongue (600) on the hood; the base plate (100) is provided with a locking plate shaft (103) and a stop shaft (104), and the locking plate (300) and the stop assembly (200) are respectively mounted on the locking plate shaft (103) and the stop shaft (104); The spring-loaded device is used to provide an upward spring force to the latch (600); The stop assembly (200) is provided with a stop elastic element; characterized in that The stop assembly (200) is provided with a stop pawl (207), and the clamping plate (300) is provided with a self-weight stop (302), a half-lock stop (303) and a full-lock stop (304) adapted to the stop pawl (207). The stop pawl (207) cooperates with each stop to lock the rotation position of the clamping plate (300). The pop-up device is provided with an upper limit position that restricts upward movement. When the locking plate (300) and the stop pawl (207) are engaged in the self-weight stop position (302), the locking tongue (600) is located above the upper limit position of the pop-up device. The stop assembly (200) includes an opening arm (202) and a stop arm (203), and the lower end of the opening arm (202) is provided with a rotating pawl (204). The stop pawl (207) is provided on the stop arm (203), and the stop arm (203) is also provided with a backstop pawl (208) that moves synchronously with the stop pawl (207). The clamping plate (300) is provided with a first blocking block (305) and a second blocking block (306) that are staggered with each stop. A clearance notch (307) is provided between the first blocking block (305) and the second blocking block (306). The rotating pawl (204) includes a front pawl (209) and a second rear pawl (211). The front pawl (209) can engage with the first blocking block (305) and the second blocking block (306) and can enter the clearance notch (307). The second rear pawl (211) can abut against the backstop pawl (208).

2. The double-pull hood lock with gravity self-locking function according to claim 1, characterized in that, The rotating pawl (204) also includes a first rear pawl (210) which can abut against the anti-reverse pawl (208).

3. The double-pull hood lock with gravity self-locking function according to claim 1, characterized in that, It also includes a card plate elastic element, which, under the action of the card plate elastic element, tends to rotate in the unlocking direction.

4. The double-pull hood lock with gravity self-locking function according to claim 2, characterized in that, The opening arm (202) is provided with a rotating claw limiting part (213), which is used to limit the extreme position of the rotation of the rotating claw (204).

5. The double-pull hood lock with gravity self-locking function according to claim 4, characterized in that, The lower end of the opening arm (202) is provided with a connection point for connecting to an external pull rope, and the base plate (100) is provided with a first limiting block (107) and a second limiting block (108) that limit the pulling range of the pull rope.

6. The double-pull hood lock with gravity self-locking function according to claim 4, characterized in that, The card plate (300) is provided with a ramp (309), the ramp (309) and the stop pawl (207) are on the same plane, and the ramp (309) is configured to engage with the stop pawl (207) in the end stroke of unlocking.

7. The double-pull hood lock with gravity self-locking function according to claim 4, characterized in that, The base plate (100) is provided with a first limiting part (105) for the stop arm, which is used to limit the extreme position of the stop arm (203) rotating in the locking direction.

8. The double-pull hood lock with gravity self-locking function according to claim 7, characterized in that, The base plate (100) is provided with a second limiting part (106) for the stop arm, which is used to limit the extreme position of the stop arm (203) rotating in the opening direction.

9. The double-pull hood lock with gravity self-locking function according to claim 4, characterized in that, The locking plate (300) is provided with a locking hook (308); the locking hook (308) is used to cooperate with the U-shaped locking groove (102) to lock the locking tongue (600) on the hood; the end of the locking hook (308) is configured to be pushed by the locking tongue (600) during the unlocking process when the hood is lifted, thereby driving the locking plate (300) to rotate in the unlocking direction.

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