A one-way locking system for vehicles and method of use

Abstract

This invention discloses a vehicle one-way locking system and its usage method. The system includes a lock body, a latch, and an unlocking mechanism. The lock body includes a lock body shell, a ratchet, a first pawl, a second pawl, a return spring, and a latch movement channel disposed inside the lock body shell. One end of the return spring is fixed to the lock body shell, and the other end is fixed to the second pawl. The unlocking mechanism is fixed to the second pawl. The design of the latch movement channel ensures that the latch and the lock body will not interfere with each other during the opening and closing of the engine hood. When the engine hood is closed, the latch pushes the ratchet downward from the unlocked position to its lower limit position, after which the ratchet automatically returns to the ratchet locking position and engages with the first pawl. After the latch reaches its locking position, it is blocked by the ratchet and cannot move in the opening direction, thus achieving one-way locking. When the engine hood is opened, the unlocking mechanism is operated to release the restriction of the second pawl on the first pawl, and the restriction of the first pawl on the ratchet is released, thus enabling the engine hood to be opened smoothly.

Description

Technical Field

[0001] This invention belongs to the field of locking device technology, and more specifically, relates to a one-way locking system for vehicles and its usage method. Background Technology

[0002] For cars that adopt an overall front-tilting engine hood arrangement, the engine hood will swing significantly relative to the car body while driving. For example, patent CN201811442678.X discloses a front-tilting engine hood, connecting structure and car. The engine hood of such cars usually includes two locking mechanisms. Although the flexible locking mechanism with rubber straps arranged on both sides of the rear end of the hood can ensure that the engine hood will not open by itself while driving, this locking mechanism is located outside the car and cannot meet the needs of anti-theft.

[0003] To meet anti-theft requirements, the locking mechanism is typically located in the engine compartment, specifically on the lower rear edge of the hood. This design allows unlocking only via a handle located inside the driver's cab. Currently, the most common locking mechanisms fall into two main categories: latching and pin-type. While latching mechanisms can achieve the locking function, the clearance between the lock body and the latch is small, preventing significant relative movement between them when locked, making them unsuitable for single-piece front-opening hoods. Pin-type locking mechanisms, such as the double-latch locking mechanism disclosed in patent CN201720901407.0, require manual operation for both opening and locking, resulting in inconvenience.

[0004] Therefore, there is an urgent need for a locking device that meets anti-theft requirements, is applicable to vehicles with a single-piece front-tilting engine hood where there is significant relative movement between the engine hood and the vehicle body during driving, and is also easy to use. Summary of the Invention

[0005] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a vehicle one-way locking system and its usage method. The unlocking mechanism is located inside the vehicle, which can meet the requirements of vehicle anti-theft. While realizing the locking function, it can also meet the characteristics of the large relative movement between the engine hood and the body of the car with the overall front-flip engine hood arrangement during driving. At the same time, the structural mechanism is operated only when the engine hood is opened, and no additional operation is required when the engine hood is closed, which improves the ease of operation.

[0006] To achieve the above objectives, one aspect of the present invention provides a vehicle one-way locking system, including a lock body, a latch, and an unlocking mechanism; wherein, the lock body is fixed to the front crossbeam of the vehicle body; one end of the unlocking mechanism is connected to the lock body, and the other end passes through the body sheet metal and is connected to the opening handle; the latch is arranged at the lower part of the rear edge of the engine hood; the lock body includes a lock body shell, a ratchet, a first pawl, a second pawl, a return spring disposed inside the lock body shell, and a latch movement channel disposed on the lock body shell; one end of the return spring is fixed to the lock body shell, and the other end is fixed to the second pawl; the unlocking mechanism is fixed to the second pawl; the ratchet, the first pawl, and the second pawl are respectively rotatably disposed on the lock body shell; the latch movement channel is located at the lower part of the rear edge of the engine hood; the lock body includes a lock body shell, a ratchet, a first pawl, a second pawl, and a return spring disposed inside ... ratchet is located at the lower part of the rear edge of the engine hood; the lock body includes a lock body shell, a first pawl, a second pawl, and a return spring disposed inside the lock body shell; the lock body includes a lock body shell, a first pawl, a second pawl, and a return spring disposed inside the lock body shell; the lock body includes a lock body shell, a first pawl, a second pawl, a return spring disposed inside the lock body shell; the lock body includes a lock body shell, a first pawl, a second pawl, a return spring disposed inside the lock body shell; the lock body includes a lock body shell, a first pawl, a second pawl, a return spring disposed inside the lock body shell Based on the latch and latch assembly deviation, it is determined that the latch and lock body will not interfere with each other during the opening and closing of the engine hood; it can meet the needs of relative movement between the latch and lock body during driving; the ratchet is provided with a first preload torsion spring for providing preload force within the range of the ratchet moving from the lower limit position to the locked position, and enabling the ratchet to automatically return to the locked position smoothly from the lower limit position after disengaging from the downward moving latch; and a second preload torsion spring for providing preload force within the range of the ratchet moving from the upper limit position to the unlocked position in the unlocked state, and enabling the ratchet to automatically return to the unlocked position smoothly from the upper limit position after disengaging from the upward moving latch; the first pawl is provided with a third preload torsion spring for automatically rotating upward and reaching the upper limit position after disengaging from the second pawl;

[0007] When the engine hood is closed, the latch pushes the ratchet downwards from the unlocked position to the lower limit position. Under the action of the first pre-tensioned torsion spring, the ratchet automatically returns to the locked position and engages with the first pawl. After the latch reaches its locked position, it engages with the lock body. The ratchet, the first pawl, and the second pawl are all in the locked position. The latch is blocked by the ratchet and cannot move from the locked position to the opening direction, thus achieving one-way locking. When it is necessary to open the engine hood, the unlocking mechanism is operated to release the restriction of the second pawl on the first pawl, which in turn releases the restriction of the first pawl on the ratchet, allowing the engine hood to be opened smoothly.

[0008] Furthermore, when the latch, ratchet, first pawl, second pawl, and return spring are all in the locked position, the latch is located within the latch movement channel, and the ratchet spans across the latch movement channel; the second pawl restricts the rotation of the first pawl, the first pawl restricts the ratchet from opening, and the return spring is in a horizontal position and at its original length.

[0009] Furthermore, the latch movement channel includes a latch bottom movable cavity and a latch upper and lower movable cavity connected above the latch bottom movable cavity; the opening width of the latch bottom movable cavity on the side wall of the lock body shell is greater than the opening width of the latch upper and lower movable cavity.

[0010] The opening width of the upper and lower moving chambers of the latch is greater than or equal to the sum of the latch pin diameter and twice the Y-direction deviation; the Y-direction deviation of the latch is determined by the assembly deviation and the deformation during the opening and closing of the engine hood.

[0011] Furthermore, when the latch is locked, there is a gap between the lowest position of the latch bottom movable cavity and the lower limit position of the ratchet movement profile, so that when the latch falls to the locked position, the lower end of the latch can disengage from the ratchet.

[0012] Furthermore, during the up-and-down movement of the latch, the first pawl only contacts and disengages from the ratchet, and the movement profile of the first pawl is located outside the latch movement channel.

[0013] Furthermore, the first preload torsion spring and the second preload torsion spring are respectively arranged around the ratchet axis on both sides of the ratchet; both the first preload torsion spring and the second preload torsion spring include a fixed end and a movable end;

[0014] The fixed end of the first preload torsion spring engages with the edge of the top of the lock body housing, and the movable end connects to the ratchet after rotating around the ratchet shaft several times. When the first preload torsion spring is in the free state, the position of the movable end of the first preload torsion spring is higher than the position of the movable end of the first preload torsion spring when the ratchet is in the unlocked position, so that when the ratchet is in the unlocked position, the preload force of the first preload torsion spring can counteract the weight of the ratchet.

[0015] Furthermore, a torsion spring limiting plate is arranged on the ratchet shaft. When the ratchet rotates upwards beyond the ratchet unlocking position, the movable end of the first pre-tensioning torsion spring will be stuck on the torsion spring limiting plate, so that the pre-tensioning force of the first pre-tensioning torsion spring cannot act on the ratchet as it continues to rotate upwards. When the ratchet rotates downwards past the unlocking position, the first pre-tensioning torsion spring will generate a pre-tensioning effect, thereby keeping the ratchet stably in the unlocking position.

[0016] Furthermore, one end of the third pre-tightening torsion spring is secured to the retaining post on the first pawl, while the other end is a free-moving end; the pre-tightening force of the third pre-tightening torsion spring causes the first pawl to automatically rotate upward after disengaging from the locking action of the second pawl and reach the upper limit position.

[0017] The torque applied to the second pawl by the return spring connected to the second pawl is greater than the preload torque applied to the first pawl by the third preload torsion spring on the first pawl.

[0018] Furthermore, one end of the ratchet is rotatably connected to the inner wall of the lock body housing, and the other end is a movable end, with a first latch on the movable end;

[0019] The center of the first pawl is rotatably connected to the inner wall of the lock body housing, and both ends are movable ends with opposite movement paths;

[0020] One end of the first pawl is provided with a second latch that matches the first latch, and the other end is provided with a third latch that matches the second pawl;

[0021] The second pawl is spaced below the first pawl, and one end of the second pawl is provided with a fourth latch that matches the third latch, and the other end is provided with a fixing lug that connects to the cable of the unlocking mechanism.

[0022] The inner wall of the lock body shell is also provided with a limiting post for limiting the second pawl to the locked position;

[0023] One end of the return spring is fixed to the inner wall of the lock body housing, and the other end is fixed to the fixing lug of the second pawl.

[0024] Another aspect of the present invention provides a method of using a vehicle one-way locking system, comprising the following steps:

[0025] S100: After installing the lock body, latch, and unlocking mechanism on the vehicle, close the engine hood to ensure that the lock body, latch, and unlocking mechanism are all locked.

[0026] S200: When the engine hood needs to be opened, pull the unlocking mechanism to release the second pawl from the first pawl, and the first pawl from the ratchet. The ratchet will automatically rotate upward to the unlock position under the action of the second preload torsion spring, and the first pawl will automatically rotate upward to the upper limit position under the action of the third preload torsion spring, and then the unlocking mechanism will be released. The second pawl will return to the locked position under the pull of the return spring, and at the same time push the first pawl to return to the locked position. In this way, the locking mechanism can be unlocked and the engine hood can be opened smoothly.

[0027] S300: When the engine hood needs to be closed, the latch pushes the ratchet downwards from the ratchet unlock position to the ratchet lower limit position. Under the action of the first pre-tension torsion spring, the ratchet automatically returns to the ratchet locking position and engages with the first pawl. After the latch reaches its locking position, it is blocked by the ratchet and cannot move from the locking position to the opening direction, thus achieving one-way locking.

[0028] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0029] (1) The present invention provides a vehicle one-way locking system, wherein the unlocking mechanism is located inside the vehicle, which can meet the requirements of vehicle anti-theft; the movement of the first pawl in the lock body is controlled by the second pawl. In the locked position, the second pawl restricts the rotation of the first pawl, so that the first pawl can block the movement of the ratchet in the opening direction; the unlocking mechanism controls the return spring to unlock the second pawl, thereby releasing the restriction on the first pawl and the restriction on the ratchet by the first pawl, and the locking mechanism can be unlocked, and the engine hood can be opened smoothly; the unlocking mechanism controls the return spring to release the unlocking mechanism after the second pawl is unlocked, and the second pawl can return to its initial locked position under the action of its return spring; when there is no latch and the first pawl is not in action, the ratchet is required to always remain in the unlocked position under the action of its own pre-tension torsion spring, and this unlocked position must be located on the latch running channel; the ratchet is set to push the ratchet to rotate first during the opening and closing of the latch, and finally disengage from the ratchet; when the engine hood is closed, when the latch pushes the ratchet to move from the open position to the locked position, the ratchet... The first pawl is pushed to move, but it does not obstruct the movement of the ratchet. As the ratchet continues to move downwards under the push of the latch, it first disengages from the ratchet and then returns to the locked position under the action of the third pre-tensioned torsion spring. The ratchet continues to move downwards under the push of the latch until it disengages from the latch. Then, under the action of the first pre-tensioned torsion spring, the ratchet moves in the opposite direction towards the locked position and stops at the locked position after encountering the first pawl. At this point, due to the obstruction of the first pawl, the ratchet cannot move in this direction. Therefore, when the latch moves from the locked position to the opening direction, the ratchet can block the latch, achieving one-way locking. When it is necessary to open the hood, the unlocking mechanism is operated to release the restriction of the second pawl on the first pawl, thereby releasing the restriction of the first pawl on the ratchet and allowing the hood to open smoothly. This invention can meet the requirements of vehicle anti-theft and achieve vehicle locking function. Furthermore, the unlocking mechanism is only operated when opening the hood, and no additional operation is required when closing the hood, improving ease of operation.

[0030] (2) In a vehicle one-way locking system of the present invention, the area below the ratchet and the first pawl is set as the area for the latch and the lock body to cooperate, allowing a large relative movement between the lock body and the latch; the latch running channel during the latch opening and closing process and the latch running space during driving are restricted by the notch on the lock body shell; the latch running channel is determined according to the latch and the latch assembly deviation, ensuring that the latch and the lock body will not interfere during the opening and closing of the engine hood, which can meet the needs of the relative movement between the latch and the lock body during driving, and can meet the characteristics of the large relative movement between the engine hood and the body of the car with the overall front-flip engine hood arrangement during driving.

[0031] (3) A vehicle-mounted one-way locking system of the present invention includes two ratchet preload torsion springs arranged on the ratchet. The first preload torsion spring is used to provide preload force from the unlock position to the lower limit position of the ratchet, enabling the ratchet to automatically return to the unlock position from the lower limit position (after disengaging from the latch and the first pawl). At the same time, a torsion spring limiting plate is provided. When the ratchet moves beyond the unlock position and continues to move to the upper limit position, the limiting plate will restrict the action of the torsion spring and keep it in the unlock position. The second preload torsion spring is used to provide preload force from the ratchet unlock position to the upper limit position of the ratchet, ensuring that the ratchet can always automatically return to the unlock position from the upper limit position after disengaging from the latch and the first pawl. The above configuration enables the ratchet to always remain in the unlock position when there is no latch or first pawl action. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the connection structure of a vehicle-mounted one-way locking system according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the installation position of the lock body of a vehicle one-way locking system according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram showing the installation position of the latch in a vehicle one-way locking system according to an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the installation position of a vehicle-mounted one-way locking system in a vehicle according to an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the locking mechanism of a vehicle one-way locking system according to an embodiment of the present invention, showing the arrangement of the latch inside the lock body.

[0037] Figure 6 This is a schematic diagram of the lock body of a vehicle one-way locking system in the locked state according to an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the movement state of the second pawl in a vehicle one-way locking system according to an embodiment of the present invention when the unlocking mechanism is pulled but not released;

[0039] Figure 8 This is a schematic diagram of the movement state of the first pawl and ratchet of a vehicle one-way locking system according to an embodiment of the present invention when the unlocking mechanism is not released;

[0040] Figure 9 This is a schematic diagram of the movement state of the second pawl and the first pawl after the unlocking mechanism is released in a vehicle one-way locking system according to an embodiment of the present invention;

[0041] Figure 10This is a schematic diagram of a vehicle one-way locking system according to an embodiment of the present invention, in which the latch pushes the ratchet downward when the engine hood is closed;

[0042] Figure 11 This is a schematic diagram illustrating the positional relationship between the ratchet and the latch movement channel of a vehicle one-way locking system according to an embodiment of the present invention at different positions;

[0043] Figure 12 This is a schematic diagram showing the installation position of the first preload torsion spring inside the lock body of a vehicle one-way locking system according to an embodiment of the present invention;

[0044] Figure 13 This is a schematic diagram of the mounting structure of the first preloaded torsion spring on the ratchet in an embodiment of the present invention for a vehicle one-way locking system;

[0045] Figure 14 This is a schematic diagram showing the installation position of the second preload torsion spring inside the lock body of a vehicle one-way locking system according to an embodiment of the present invention;

[0046] Figure 15 This is a schematic diagram of the mounting structure of the second preload torsion spring on the ratchet in an automotive one-way locking system according to an embodiment of the present invention;

[0047] Figure 16 This is a schematic diagram of the installation structure of the third preload torsion spring on the first pawl inside the lock body of a vehicle one-way locking system according to an embodiment of the present invention.

[0048] Figure 17 This is a schematic diagram of the structure of the latch movement channel of a vehicle one-way locking system on the lock body shell according to an embodiment of the present invention;

[0049] Figure 18 This is a schematic diagram of the structure of the latch of a vehicle one-way locking system according to an embodiment of the present invention;

[0050] Figure 19 This is a schematic diagram of the installation of the latch of a vehicle one-way locking system on the lock body according to an embodiment of the present invention;

[0051] Figure 20 This is a flowchart illustrating a method for using a vehicle-mounted one-way locking system according to an embodiment of the present invention.

[0052] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-lock body, 100-front crossbeam of the vehicle body, 200-body sheet metal, 300-engine hood, 11-lock body housing, 12-ratchet, 121-first latch, 122-first pre-tension torsion spring, 123-second pre-tension torsion spring, 124-ratchet shaft, 125-torsion spring limiting plate, 13-first pawl, 131-second latch, 132-third latch, 133-third pre-tension torsion spring, 14-second pawl, 141-fourth latch, 142-fixed ear, 143-limiting post, 15-return spring, 16-lock movement channel, 161-bottom movable cavity of the lock, 162-upper and lower movable cavity of the lock, 2-lock, 21-support plate, 22-pin, 3-locking mechanism, 4-opening handle. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, when an element is referred to as "fixed to," "set on," or "provided on" another element, it can be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to or indirectly connected to the other element. The terms "mounted," "connected," "linked," and "provided with" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] When driving, the hood of a single-piece front-tilting engine hood will swing significantly relative to the front of the vehicle body. At this time, the locking body and the latch will also have a large relative movement (more than 10mm of swing in the Y and Z directions). Although the existing plate-type locking mechanism can achieve the locking function, the gap between the locking body and the latch is small, and large relative movement between the locking body and the latch is not allowed when locked, so it is not suitable for a single-piece front-tilting engine hood. As for the pin-type locking mechanism, it requires operation when opening and locking, which is inconvenient to use.

[0057] Based on the above reasons, such as Figures 1-5 As shown, one aspect of the present invention provides a vehicle one-way locking system, including a lock body 1, a latch 2, and an unlocking mechanism 3; wherein, the lock body 1 is fixed to the front crossbeam 100 of the vehicle body by a bracket (e.g., Figure 2 As shown), one end of the cable of the unlocking mechanism 3 is connected to the lock body 1, and the other end passes through the body sheet metal 200 and is connected to the opening handle 4. The opening handle 4 is usually located on the driver's left side in the cab; the latch 2 is located on the lower part of the rear edge of the engine hood 300 (as shown). Figure 3 (As shown); When the hood is closed, the lock body and latch are located inside the engine compartment and cannot be accessed from the outside. The unlocking mechanism 3 can only be operated by the opening handle 4 located on the driver's left side in the cab (as shown). Figure 4 (As shown); In this invention, the direction consistent with the driving direction is defined as the X direction, the direction parallel to the ground and perpendicular to the X direction is defined as the Y direction, and the direction perpendicular to the ground is defined as the Z direction; Since the overall front-flipping engine hood will have a large swing relative to the front of the vehicle body during driving, the lock body and the latch will also have a large relative movement (more than 10mm of swing in the X, Y, and Z directions). To prevent interference and collision when the lock body and the latch move relative to each other, the locking body and the latch are designed as follows: Figure 5 As shown, the lock body only restricts the movement of the latch in the opening direction; when opening the engine hood, it needs to be unlocked first before the engine hood can be opened, but when closing the engine hood, the lock body does not restrict the movement of the latch, so there is no need to operate it.

[0058] To achieve this objective, the structure of the lock body 1 involved in this invention is as follows: Figure 6As shown, the lock includes a lock body housing 11, a ratchet 12, a first pawl 13, a second pawl 14, a return spring 15 disposed inside the lock body housing 11, and a latch movement channel 16 disposed on the lock body housing 11. The ratchet 12, the first pawl 13, and the second pawl 14 are rotatably mounted on the lock body housing 11. The rotation axis of the ratchet 12 is located on one side of the latch movement channel 16, and the rotation axes of the first pawl 13 and the second pawl 14 are spaced apart from top to bottom on the other side of the latch movement channel 16. The ratchet 12, the first pawl 13, and the second pawl 14 are respectively provided with a pre-tensioning torsion spring and a retaining post. The pre-tensioning torsion spring is used to control their respective rotation angles. The retaining post is used to limit the end position of the rotation torsion spring. During the opening and closing of the latch 2, the ratchet 12 first pushes the first pawl 13 to rotate and eventually disengages from the first pawl 13.

[0059] Furthermore, such as Figure 18 and Figure 19 As shown, the latch 2 includes a support plate 21 and a pin 22 disposed on the support plate 21; the support plate 21 is mounted on the engine hood 300; both the support plate 21 and the pin 22 are L-shaped; one end of the pin 22 is mounted on one plate of the support plate 21, and the other end is mounted on the other plate of the support plate 21; the support plate 21 and the pin 22 form a hollow square space; when the latch is installed on the lock body, the pin 22 passes through the latch movement channel 16 from top to bottom to reach the bottom space of the latch movement channel 16.

[0060] Furthermore, such as Figure 6 As shown, one end of the ratchet 12 is rotatably connected to the inner wall of the lock body housing 11, and the other end is a movable end, with a first latch 121 on the movable end; the center of the first pawl 13 is rotatably connected to the inner wall of the lock body housing 11, both ends are movable ends, and their movement paths are opposite; one end of the first pawl 13 has a second latch 131 that matches the first latch 121, and the other end has a third latch 132 that matches the second pawl 14; the second pawl 14 is spaced below the first pawl 13, and its center is rotatably connected to the inner wall of the lock body housing 11. One end of the second pawl 14 is provided with a fourth latch 141 that matches the third latch 132, and the other end is provided with a fixing lug 142 that connects to the cable of the unlocking mechanism 3; one end of the return spring 15 is fixed to the inner wall of the lock body shell 11, and the other end is fixed to the fixing lug 142 of the second pawl 14; the inner wall of the lock body shell 11 is also provided with a limiting post 143 for limiting the second pawl 14 to the locked position; the second pawl 14 can rotate to its locked position under the action of its return spring, and the limiting post 143 can accurately limit the locked position of the second pawl 14.

[0061] Furthermore, such as Figure 6 As shown, when the engine hood is in the locked state, the latch 2 is located within the latch movement channel 16. The first latch 121 on the ratchet 12 engages with the second latch 131 on the first pawl 13, and the first latch 121 is located below the second latch 131. The third latch 132 on the first pawl 13 engages with the fourth latch 141 on the second pawl 14, and the end of the third latch 132 is in contact with the inner surface of the fourth latch 141. The second latch 131 on the first pawl 13 is in a horizontal position. The return spring 15 is located... The latch 2 is in a horizontal position and at its original length. At this time, the ratchet 12 spans the latch movement channel 16 through which the latch 2 moves up and down. If the engine hood is opened at this time, the latch 2 will be blocked by the ratchet 12 when it moves upward. When the latch 2 continues to move upward, the ratchet 12 will continue to rotate upward and push the first pawl 13. However, the upward rotation of the first pawl 13 will be restricted by the second pawl 14, so that the latch cannot be disengaged from the lock body, thus realizing the locking function. At this time, the latch 2, ratchet 12, first pawl 13, second pawl 14 and return spring 15 are all in the locked position.

[0062] Furthermore, such as Figure 6 and Figure 7 As shown, when unlocking is required, the operator operates the unlocking mechanism 3 in the cab. The cable 31 on the unlocking mechanism 3 pulls the fixing lug of the second pawl 14, causing the second pawl 14 to rotate counterclockwise. The return spring 15 is in a stretched state (e.g., Figure 7 As shown), at this time, the second pawl 14 is released from its limit on the first pawl 13, and the lock body 1 is unlocked from the lock latch 2, so the engine hood can be opened smoothly.

[0063] Furthermore, such as Figure 8 As shown, to ensure reliable unlocking, when the unlocking mechanism 3 releases the second pawl 14 from the first pawl 13, and before the unlocking mechanism 3 is released, the ratchet 12 and the first pawl 13 rotate upward to a set angle under the action of their respective pre-tensioned torsion springs and remain at that position. This position is the ratchet unlocked state position, i.e., the ratchet unlocked position. At this time, the states of the ratchet 12, the first pawl 13, and the second pawl 14 are as follows: Figure 8 As shown, the ratchet 12 is still located on the locking movement channel 16 where the latch 2 moves up and down. The ratchet 12 and the first pawl 13 are separated. At this time, the ratchet 12 reaches the ratchet unlock position; the first pawl 13 reaches its upper limit position. At this time, if the latch 2 moves upward, it will still hit the ratchet 12 and push it to continue moving upward.

[0064] Furthermore, such as Figure 9As shown, after the operator unlocks the mechanism 3, they release it, so that the cable 31 on the mechanism 3 does not apply tension to the fixing lug of the second pawl 14. At this time, under the pull of the return spring 15, the return spring 15 gradually retracts to its original length, causing the second pawl 14 to rotate clockwise. Simultaneously, the fourth latch 141 on the second pawl 14 pushes the first pawl 13, causing the second latch 131 on it to return to the horizontal position, i.e., the locked position. The second pawl 14 rotates towards its locked position under the action of its pre-tension torsion spring, and after reaching the locked position, it engages with the limit post 143. Then, the operator goes outside the driver's seat and opens the engine hood. The latch 2 moves upward until it disengages from the lock body 1. During this process, the upward movement of the latch 2 pushes the ratchet 12 to rotate upward until it disengages from the latch 2. The position where the ratchet 12 disengages from the latch 2 is the upper limit position of the ratchet movement. Subsequently, the ratchet 12 returns to the ratchet unlock position under its own weight and the action of its pre-tension torsion spring. Figure 9 As shown in the diagram; at this time, the lock body 1 only restricts the movement of the latch 2 in the upward direction (i.e., the latch movement in the direction of opening the engine hood), and no longer restricts the movement of the latch 2 in the downward direction (i.e., the latch movement in the direction of closing the engine hood);

[0065] Furthermore, such as Figure 10 As shown, after the engine hood is opened and before it is closed, the ratchet 12, the first pawl 13, and the second pawl 14 on the lock body 1 are in the following positions: Figure 9 The state shown; when the engine hood is closed and the latch 2 moves downward, the movement of the latch 2, ratchet 12, first pawl 13, and second pawl 14 is divided into four stages; in the first stage: after the latch 2 contacts the ratchet 12, it pushes the ratchet 12 to rotate clockwise, and after the ratchet 12 touches the first pawl 13, it also pushes the first pawl 13 to rotate downward; in the second stage: as the latch 2 continues to move downward, the first pawl 13 first disengages from the ratchet 12, and then, under the action of its pre-tensioned torsion spring, the first pawl 13 returns the second latch 131 to the horizontal position, that is, the first pawl 13 returns to the horizontal position. Figure 9 The position shown; Third stage: Lock 2 continues to move downwards, ratchet 12 disengages from lock 2, at which point ratchet 12 reaches its lower limit position; Fourth stage: Under the action of the pre-tensioned torsion spring on ratchet 12, ratchet 12 rotates counterclockwise to return to the horizontal position, at which point ratchet 12 touches and engages with the first pawl 13; At this time, ratchet 12, the first pawl 13, the second pawl 14, and the return spring 15 are all in the following positions. Figure 6 The state shown is the locked position;

[0066] In other words, when the engine hood moves from the open position to the locked position, the latch 2 pushes the ratchet 12 downward, and the ratchet 12 pushes the first pawl 13 clockwise downward. At this time, the first pawl 13 does not obstruct the movement of the ratchet 12. As the ratchet 12 continues to move downward, the first pawl 13 first disengages from the ratchet 12, and then returns to the locked position on its own under the action of its own pre-tension torsion spring. The ratchet 12 continues to move under the push of the latch until it disengages from the latch 2. After that, the ratchet 12 moves in the opposite direction of the locked position under the action of its own pre-tension torsion spring. It stops after hitting the bottom of the first pawl 13. At this time, due to the obstruction of the first pawl 13, the ratchet 12 can no longer continue to rotate in the direction of the natural state position or the upper limit position. Therefore, when the engine hood moves from the locked position to the open direction, that is, when the latch 2 moves upward in the latch movement channel 16, the ratchet 12 can block the latch 2, thereby achieving one-way locking.

[0067] Furthermore, during the opening and locking of the engine hood, the rotation range of the ratchet 12 and the first pawl 13 is related to the width of the latch movement channel 16 for the up-and-down movement of the latch 2, as well as the dimensions of the ratchet and the first pawl, and is affected by the overall front-flipping engine hood structure; the lock body shell 11 is a hollow box structure, including oppositely arranged components; the latch movement channel 16 is determined according to the latch and the latch assembly deviation to ensure that the latch and the lock body will not interfere during the opening and closing of the engine hood, and can meet the needs of relative movement between the latch and the lock body during driving; the latch movement channel 16 includes a latch bottom movable cavity 161 and a latch up-and-down movement cavity 162 connected above the latch bottom movable cavity 161; the central axes of the latch bottom movable cavity 161 and the latch up-and-down movement cavity 162 are collinear; the opening width of the latch bottom movable cavity 161 on the side wall of the lock body shell 11 is greater than that of the latch up-and-down movement cavity 162. The width of the upper and lower movement cavity 162 of the latch is greater than the pin diameter of the latch 2. The width of the upper and lower movement cavity 162 of the latch is determined by the pin diameter of the latch and the Y-direction deviation of the latch. The width of the upper and lower movement cavity of the latch is greater than or equal to the sum of the pin diameter of the latch and twice the Y-direction deviation. The Y-direction deviation of the latch is determined by the assembly deviation and the deformation during the opening and closing of the engine hood. The limit position of the movable end of the ratchet 12 is the position when the latch disengages from the ratchet during the movement of the latch from the edge position close to the first pawl 13 of the upper and lower movement cavity 162. It is determined by the intersection of the ratchet movement contour range and the edge of the latch movement channel during the design. In order for the latch and the lock body to lock when the engine hood falls to the closed position, it is necessary to ensure that the lower end of the latch can disengage from the ratchet when the latch falls to the locked position. During the design, a gap is left between the lowest position of the latch when it is locked and the lower limit position of the ratchet movement contour.

[0068] Furthermore, a gap is left between the bottom movable cavity 161 of the latch and the bottom of the lock body shell 11; the return spring 15 is provided on the inner wall of the shell between the bottom of the bottom movable cavity 161 of the latch and the bottom of the lock body shell 11.

[0069] Furthermore, such as Figure 5 As shown, after the engine hood moves to the closed position, the latch 2 stops moving and remains inside the movable cavity 161 at the bottom of the latch. At this time, the gap between the latch and the ratchet and pawl of the lock body is relatively large, and the relative displacement between the latch and the lock body within a certain range will not interfere. The latch movement space can be designed in this area to meet the requirements of the engine hood movement conditions. The range of this space is determined according to the Y-axis and Z-axis swing of the engine hood during driving, ensuring that the latch and the lock body will not interfere when the engine hood swings during driving. At the same time, this movement space should ensure that after the latch moves to the locked position, the ratchet and pawl of the lock body return to their original positions. Figure 5 The state shown.

[0070] Furthermore, to reduce the difficulty of verification during the design process, the first pawl 13 is designed to only contact and disengage from the ratchet 12 during the up-and-down movement of the latch 2. The movement profile of the first pawl 13 is located outside the latch movement channel and will not directly contact the latch.

[0071] Furthermore, such as Figure 11 As shown, to ensure the lock body can open normally or engage with the latch, it is necessary to ensure that after unlocking, the ratchet, under the force of gravity and the second preload torsion spring 123, can always remain in the ratchet unlock position and stay on the latch movement channel (e.g., Figure 8 As shown); after the lock body and the latch engage, the space at the bottom of the latch is relatively large (as shown). Figure 5 As shown), this design allows for relative movement between the latch and the lock body within a certain range during driving. Under normal circumstances, the relative movement range is limited to a specified range. A notch is made in the lock body casing to restrict this range, and the latch's movement channel is also limited by this notch (e.g., ...). Figure 17 (as shown); In other words, after the lock body and the latch engage, the notch in the latch movement channel on the lock body shell can meet the needs of relative movement between the latch and the lock body during driving; that is, after the lock body and the latch engage, the notch design in the latch movement channel on the lock body shell can allow the bottom end of the latch to move normally in the latch bottom movable cavity 161, and can meet the needs of relative movement between the latch and the lock body during driving.

[0072] Furthermore, such as Figures 12-16As shown, to ensure that the ratchet can accurately reach different working positions under different working conditions, two preload torsion springs are arranged on the ratchet, namely a first preload torsion spring 122 and a second preload torsion spring 123. The first preload torsion spring 122 and the second preload torsion spring 123 are respectively arranged around the ratchet shaft 124 on both sides of the ratchet. The first preload torsion spring 122 and the second preload torsion spring 123 both include a fixed end and a movable end. The first preload torsion spring 122 is used to provide preload force for the ratchet to move from the lower limit position to the locked position range, and enables the ratchet to smoothly return to the locked position from the lower limit position after disengaging from the downward movement of the latch. The second preload torsion spring 123 is used to provide preload force for the ratchet to move from the upper limit position to the unlocked position range in the unlocked state, and enables the ratchet to smoothly return to the unlocked position from the upper limit position after disengaging from the upward movement of the latch.

[0073] Furthermore, such as Figures 12-15 As shown, the fixed end of the first preload torsion spring 122 engages with the edge of the top of the lock body housing 11, and the movable end connects to the ratchet 12 after rotating around the ratchet shaft 124 several times. When the first preload torsion spring 122 is in its free state, the position of the movable end is higher than the position of the movable end when the ratchet is in the unlocked position, so that when the ratchet is in the unlocked position, the first preload torsion spring 122 has a certain preload force, which can counteract the weight of the ratchet. Simultaneously, in order to enable the ratchet to return to and remain in the unlocked position after reaching the lower limit position, a torsion spring limiting plate 125 is arranged around the ratchet shaft. The torsion spring limiting plate 125 is fixed to the ratchet shaft and will not rotate with the ratchet. The plate 125 has an "L"-shaped flange. When the ratchet rotates upwards beyond the ratchet unlock position, the movable end of the first pre-tensioning torsion spring 122 will be stuck on the torsion spring limiting plate 125, so that the pre-tensioning force of the first pre-tensioning torsion spring 122 cannot act on the ratchet as it continues to rotate upwards. When the ratchet rotates downwards past the unlock position, the first pre-tensioning torsion spring 122 will generate a pre-tensioning effect, so that the ratchet will be stably held in the unlock position. Therefore, after the ratchet is unlocked, the pre-tensioning force of the first pre-tensioning torsion spring 122 can enable the ratchet to overcome other resistances and return to the unlock position. At the same time, after the lock body is locked, the pre-tensioning force of the first pre-tensioning torsion spring 122 can hold the ratchet in the locked position.

[0074] Furthermore, such as Figures 12-15As shown, to ensure that the ratchet can return to the unlocked position after reaching the upper limit position, a second preload torsion spring 123 is arranged on the ratchet. The fixed end of this torsion spring is locked to the side edge of the lock body shell, and the movable end is locked to the ratchet. When the ratchet is in the unlocked position, the movable end of the second preload torsion spring 123 is basically in a free state or slightly compressed (the preload in this compressed state is insufficient to offset the preload of the torsion spring on the other side). When the ratchet continues to move upward under the push of the latch, the movable end of the second preload torsion spring 123 is compressed, generating a preload. When the ratchet moves to the upper limit position and disengages from the latch, it will fall under the action of the preload of the second preload torsion spring 123 and return to the unlocked position. If the ratchet can return to the unlocked position under the action of gravity, this torsion spring does not need to be arranged. However, considering that there may be other forces (such as friction) when the ratchet is running, there is a risk that it will not be able to return to the unlocked position by relying solely on gravity. Therefore, this torsion spring is still provided.

[0075] Furthermore, such as Figure 16 As shown, the first pawl 13 remains in a state where it is not subjected to external forces (except for the force of gravity and the preload spring). Figure 8 The first pawl 13 is shown in its upper limit position. To ensure that the first pawl 13 remains in this state, a third preloaded torsion spring 133 is arranged around the ratchet of the first pawl 13. One end of the third preloaded torsion spring 133 is engaged with the retaining post on the first pawl 13, and the other end is a free-moving end. The preload force of the third preloaded torsion spring 133 causes the first pawl 13 to automatically rotate upward after disengaging from the engagement of the second pawl 14 and reaching the upper limit position. At the same time, after the first pawl 13 reaches the upper limit position, the unlocking mechanism is released, allowing the second pawl 14 to return to its connected return spring. Under the action of spring 15, the first pawl 13 returns to the locked position, and at the same time, the second pawl 14 pushes the first pawl 13 back to the initial locked position. The movement of the first pawl 13 is restricted by the notch in the lock body housing, so that the first pawl 13 can be held in the upper limit position under the action of the third preload torsion spring 133. Specifically, by manipulating the handle of the unlocking mechanism 3 to pull the cable, the second pawl 14 is pulled to release the restriction of the second pawl 14 on the first pawl, so that the first pawl 13, under the preload force of its own third preload torsion spring 133, is lifted upward to its upper limit position, i.e., as... Figure 9 or Figure 16 As shown in the image; after unlocking by operating the unlocking mechanism, the operator releases the operating handle of the unlocking mechanism 3, causing the second pawl 14 to return to its initial locked position under the action of its connected return spring 15 (as shown in the image). Figure 5 (as shown in the image); simultaneously, the second pawl 14 also pushes the first pawl 13 back to the initial locked position (as shown in the image). Figure 5(as shown in the position); the torque applied by the return spring connected to the second pawl 14 to the second pawl must be able to overcome the preload torque of the third preload torsion spring 133 on the first pawl 13; that is, the torque applied by the return spring connected to the second pawl 14 to the second pawl is greater than the preload torque of the third preload torsion spring 133 on the first pawl 13.

[0076] like Figure 20 As shown, another aspect of the present invention provides a method of using a vehicle one-way locking system:

[0077] S100: After installing the lock body, latch, and unlocking mechanism on the vehicle, close the engine hood to ensure that the lock body, latch, and unlocking mechanism are all locked.

[0078] S200: When the engine hood needs to be opened, pull the unlocking mechanism to release the second pawl from the first pawl, and the first pawl from the ratchet. The ratchet will automatically rotate upward to the unlock position under the action of the second preload torsion spring, and the first pawl will automatically rotate upward to the upper limit position under the action of the third preload torsion spring, and then the unlocking mechanism will be released. The second pawl will return to the locked position under the pull of the return spring, and at the same time push the first pawl to return to the locked position. In this way, the locking mechanism can be unlocked and the engine hood can be opened smoothly.

[0079] S300: When the engine hood needs to be closed, lower the engine hood, and the latch pushes the ratchet down from the ratchet unlock position to the ratchet lower limit position. After the ratchet moves from the ratchet unlock position to the ratchet lower limit position, the ratchet automatically returns to the ratchet locking position under the action of the first pre-tension torsion spring and engages with the first pawl. After the latch reaches its locking position, it is blocked by the ratchet and cannot move from the locking position to the opening direction, thus achieving one-way locking.

[0080] Furthermore, in step S300, after the latch pushes the ratchet downward from the ratchet unlock position to the ratchet lower limit position, the ratchet automatically returns to the ratchet locking position and engages with the first pawl under the action of its first pre-tension torsion spring. This also includes the ratchet pushing the first pawl to move and then disengaging from the first pawl. The first pawl returns to the locking position by itself under the pre-tension force of its third pre-tension torsion spring and the restriction of the second pawl. After the ratchet continues to move under the push of the latch and disengages from the latch, it finally reaches the lower limit position. Under the action of its first pre-tension torsion spring, the ratchet automatically moves towards the locking position, and stops at the locking position after encountering the first pawl, engaging with the first pawl.

[0081] This invention provides a vehicle one-way locking system with an unlocking mechanism located inside the vehicle, meeting vehicle anti-theft requirements. The movement of the first pawl is controlled by the second pawl. In the locked position, the second pawl restricts the rotation of the first pawl, thus preventing the ratchet from moving in the opening direction. The unlocking mechanism controls a return spring to unlock the second pawl, releasing the restriction on the first pawl and its restriction on the ratchet, allowing the locking mechanism to unlock and the engine hood to be opened smoothly. After the unlocking mechanism releases the second pawl, it returns to its initial locked position under the action of the return spring. During the process, the second pawl must overcome resistance to push the first pawl back to its locked position. When the ratchet is not engaged and the first pawl is not in action, it must remain in the unlocked position under the action of its own preload torsion spring. This unlocked position must be located on the latch's running path. For this purpose, two ratchet preload torsion springs are arranged. The first preload torsion spring provides preload force from the unlocked position to the ratchet's lower limit position, enabling the ratchet to automatically return to the unlocked position from the lower limit position (after disengaging from the latch and the first pawl). A torsion spring limit plate is also provided. When the ratchet's movement exceeds the unlocked position and continues to move to the upper limit position, the limit plate restricts the torsion spring's action, keeping it in the unlocked position. Lock position; the second preload torsion spring provides preload force from the ratchet unlock position to the ratchet's upper limit position, ensuring that the ratchet automatically returns to the unlock position from the upper limit position after disengaging from the latch and the first pawl; the ratchet is configured to first push the ratchet to rotate during both the latch opening and closing processes, and eventually disengage from the ratchet; when the latch pushes the ratchet from the open position to the locked position, the ratchet pushes the first pawl to move, but the first pawl does not obstruct the ratchet's movement; during the continued downward movement under the latch's push, the first pawl first disengages from the ratchet, and then returns to the locked position by itself under the action of the third preload torsion spring; the ratchet continues... The ratchet moves downwards under the push of the latch until it disengages from the latch. Then, under the action of the first pre-tensioned torsion spring on it, the ratchet moves in the opposite direction to the locking position and stops at the locking position after encountering the first pawl. At this time, due to the obstruction of the first pawl, the ratchet cannot move in this direction. Thus, when the subsequent latch moves from the locking position to the opening direction, the ratchet can block the latch, realizing one-way locking. The area below the ratchet and the first pawl is set as the latch and lock body mating area, allowing a large relative movement between the lock body and the latch. The latch running channel during the latch opening and closing process and the latch running space during the driving state are restricted by the notch on the lock body shell.

[0082] This invention, while meeting the requirements for vehicle anti-theft and achieving the locking function, can accommodate the characteristics of a large relative movement between the engine hood and the vehicle body when the car is in a vehicle with an overall front-flipping engine hood arrangement. At the same time, the unlocking mechanism is operated only when the engine hood is opened, and no additional operation is required when the engine hood is closed, thus improving the ease of operation.

[0083] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vehicle-mounted one-way locking system, characterized in that: For a front-opening engine hood, a locking body (1), a latch (2), and an unlocking mechanism (3) are included; wherein, the locking body (1) is fixed on the front crossbeam of the vehicle body; one end of the unlocking mechanism (3) is connected to the locking body (1), and the other end passes through the body sheet metal and is connected to the opening handle (4) inside the vehicle; the latch (2) is arranged at the lower part of the rear edge of the engine hood; the locking body (1) includes a locking body shell (11), a ratchet (12), a first pawl (13), a second pawl (14), a return spring (15) disposed inside the locking body shell (11), and a latch movement channel (16) disposed on the locking body shell (11); one end of the return spring (15) is fixed to the locking body shell (11), and the other end is fixed to the second pawl (14); the unlocking mechanism (3) is fixed to the second pawl (14); the ratchet (12), the first pawl (13), and the second pawl (14) Rotate on the lock body housing (11) respectively; The latch movement channel (16) is determined according to the latch and the latch assembly deviation to ensure that the latch and the lock body will not interfere during the opening and closing of the engine hood; The ratchet (12) is provided with a first preload torsion spring (122) for providing preload force for the ratchet to move from the lower limit position to the locking position range, and enabling the ratchet to automatically return to the unlock position from the lower limit position after disengaging from the downward moving latch, and a second preload torsion spring (123) for providing preload force for the ratchet to move from the upper limit position to the unlock position range in the unlocked state, and enabling the ratchet to automatically return to the unlock position from the upper limit position after disengaging from the upward moving latch; The first pawl (13) is provided with a third preload torsion spring (133) for automatically rotating upward and reaching the upper limit position after disengaging from the second pawl (14). When the engine hood is closed, the latch pushes the ratchet downwards from the unlocked position to the lower limit position. Under the action of the first pre-tensioned torsion spring, the ratchet automatically returns to the locked position and engages with the first pawl. After the latch reaches its locked position, it engages with the lock body. The ratchet, the first pawl, and the second pawl are all in the locked position. The latch is blocked by the ratchet and cannot move from the locked position to the opening direction, thus achieving one-way locking. When it is necessary to open the engine hood, the unlocking mechanism is operated to release the restriction of the second pawl on the first pawl, which in turn releases the restriction of the first pawl on the ratchet, allowing the engine hood to be opened smoothly.

2. The vehicle one-way locking system according to claim 1, characterized in that: When the latch (2), ratchet (12), first pawl (13), second pawl (14) and return spring (15) are all in the locked position, the latch (2) is located in the latch movement channel (16), and the ratchet (12) spans across the latch movement channel (16); the second pawl (14) restricts the rotation of the first pawl (13), the first pawl (13) restricts the ratchet (12) from opening, and the return spring (15) is in the horizontal position and at its original length.

3. A vehicle-mounted one-way locking system according to claim 2, characterized in that: The latch movement channel (16) includes a latch bottom movable cavity (161) and a latch upper and lower movable cavity (162) connected above the latch bottom movable cavity (161); the opening width of the latch bottom movable cavity (161) on the side wall of the lock body shell (11) is greater than the opening width of the latch upper and lower movable cavity (162); The opening width of the upper and lower moving chambers (162) of the latch is greater than or equal to the sum of the pin diameter of the latch and twice the Y-direction deviation; the Y-direction deviation of the latch is determined by the assembly deviation and the deformation during the opening and closing of the engine hood.

4. A vehicle-mounted one-way locking system according to claim 3, characterized in that: When the latch (2) is locked, there is a gap between the lowest position of the bottom movable cavity (161) of the latch and the lower limit position of the ratchet movement profile, so that when the latch falls to the locked position, the lower end of the latch can disengage from the ratchet.

5. A vehicle-mounted one-way locking system according to any one of claims 1-4, characterized in that: During the up-and-down movement of the latch (2), the first pawl (13) only touches and disengages from the ratchet (12), and the movement profile of the first pawl (13) is located outside the latch movement channel (16).

6. A vehicle-mounted one-way locking system according to claim 5, characterized in that: The first preload torsion spring (122) and the second preload torsion spring (123) are respectively arranged on both sides of the ratchet around the ratchet shaft (124); the first preload torsion spring (122) and the second preload torsion spring (123) each include a fixed end and a movable end; The fixed end of the first pre-tightening torsion spring (122) engages with the edge of the top of the lock body shell (11), and the movable end is connected to the ratchet (12) after turning around the ratchet shaft (124) several times. When the first pre-tightening torsion spring (122) is in the free state, the position of the movable end of the first pre-tightening torsion spring (122) is higher than the position of the movable end of the first pre-tightening torsion spring (122) when the ratchet is in the unlocked position, so that when the ratchet is in the unlocked position, the pre-tightening force of the first pre-tightening torsion spring (122) can counteract the weight of the ratchet.

7. A vehicle-mounted one-way locking system according to claim 6, characterized in that: A torsion spring limiting plate (125) is arranged on the ratchet shaft. When the ratchet rotates upwards beyond the ratchet unlock position, the movable end of the first pre-tightening torsion spring (122) will be stuck on the torsion spring limiting plate (125), so that the pre-tightening force of the first pre-tightening torsion spring (122) cannot act on the ratchet as it continues to rotate upwards. When the ratchet rotates downwards past the unlock position, the first pre-tightening torsion spring (122) will generate a pre-tightening effect, so that the ratchet will be stably kept in the unlock position.

8. A vehicle-mounted one-way locking system according to claim 7, characterized in that: One end of the third pre-tightening torsion spring (133) is locked to the retaining post on the first pawl (13), and the other end is a free-moving end; the pre-tightening force of the third pre-tightening torsion spring (133) causes the first pawl (13) to automatically rotate upward after disengaging from the locking action of the second pawl (14) and reach the upper limit position. The torque applied to the second pawl (14) by the return spring is greater than the preload torque of the first pawl (13) by the third preload torsion spring (133) on the first pawl (13).

9. A vehicle-mounted one-way locking system according to claim 8, characterized in that: One end of the ratchet (12) is rotatably connected to the inner wall of the lock body housing (11), and the other end is a movable end, and a first latch (121) is provided on the movable end. The center of the first pawl (13) is rotatably connected to the inner wall of the lock body shell (11), both ends are movable ends, and the movement paths are opposite; One end of the first pawl (13) is provided with a second latch (131) that matches the first latch (121), and the other end is provided with a third latch (132) that matches the second pawl (14). The second pawl (14) is spaced below the first pawl (13). One end of the second pawl (14) is provided with a fourth latch (141) that matches the third latch (132), and the other end is provided with a fixed ear (142) that is connected to the cable of the unlocking mechanism (3). The inner wall of the lock body housing (11) is also provided with a limiting post (143) for limiting the second pawl (14) to be in the locked position. One end of the return spring (15) is fixed to the inner wall of the lock body housing (11), and the other end is fixed to the fixing lug (142) of the second pawl (14).

10. A method of using a vehicle one-way locking system, characterized in that, The application of a vehicle one-way locking system as described in any one of claims 1-9 includes the following steps: S100: After installing the lock body, latch, and unlocking mechanism on the vehicle, close the engine hood to ensure that the lock body, latch, and unlocking mechanism are all locked. S200: When the engine hood needs to be opened, pull the unlocking mechanism to release the second pawl from the first pawl, and the first pawl from the ratchet. The ratchet will automatically rotate upward to the unlock position under the action of the second preload torsion spring, and the first pawl will automatically rotate upward to the upper limit position under the action of the third preload torsion spring, and then the unlocking mechanism will be released. The second pawl will return to the locked position under the pull of the return spring, and at the same time push the first pawl to return to the locked position. In this way, the locking mechanism can be unlocked and the engine hood can be opened smoothly. S300: When the engine hood needs to be closed, the latch pushes the ratchet downwards from the ratchet unlock position to the ratchet lower limit position. Under the action of the first pre-tension torsion spring, the ratchet automatically returns to the ratchet locking position and engages with the first pawl. After the latch reaches its locking position, it is blocked by the ratchet and cannot move from the locking position to the opening direction, thus achieving one-way locking.

Images