Front cover lock

Abstract

The utility model relates to the technical field of vehicle engineering, in particular to a front cover lock which is used for being matched with a lock ring fixed on a front cover and comprises a lock body, a lock cylinder module and a safety trigger module, the lock body is fixedly connected with a vehicle body, a lock hole for receiving the lock ring is formed in the lock body, the lock cylinder module comprises a ratchet wheel and a safety lock hook, the lock ring is limited in the lock hole through the ratchet wheel, and the safety lock hook is arranged in the lock hole. The lock ring pushes the ratchet wheel when being jacked up, the pushed ratchet wheel drives the safety lock hook, the driven safety lock hook is blocked at an outlet of the lock hole to limit the lock ring, the safety trigger module comprises a gunpowder trigger and a transmission assembly, the gunpowder trigger pushes the transmission assembly after being triggered, and the pushed transmission assembly jacks up the lock ring limited in the lock hole by the ratchet wheel. The technical problem that in the prior art, a front cover lock cannot eliminate or relieve physical damage to pedestrians after collision is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle engineering, in particular to a front cover lock. Background Art

[0002] With the rapid development of the automobile industry, consumers have higher and higher requirements for automobile safety, especially in the front-end collision accidents of vehicles, which have the highest frequency. If a collision with a pedestrian occurs, a more serious accident will occur. Therefore, it is necessary to add corresponding protection measures to increase the collision protection for pedestrians, so as to eliminate or reduce the physical damage to pedestrians after the collision. The current front cover lock only has the function of keeping the front cover closed and not disengaged, and cannot eliminate or reduce the damage to pedestrians after the collision. Utility Model Content

[0003] In order to solve the technical problem that the front cover lock in the prior art cannot eliminate or mitigate the physical damage caused to pedestrians after a collision, the present application proposes a front cover lock that solves the above technical problem.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] The utility model provides a front cover lock, which is used to cooperate with a lock ring fixed on the front cover, including: a lock body, which is fixedly connected to the vehicle body, and a lock hole for receiving the lock ring is formed on the lock body; a lock core module, which includes a ratchet and a safety lock hook, and the ratchet limits the lock ring in the lock hole, and the lock ring pushes the ratchet when it is lifted up, and the pushed ratchet drives the safety lock hook, and the driven safety lock hook blocks the lock ring at the exit of the lock hole to limit the lock ring; a safety trigger module, which includes a gunpowder trigger and a transmission assembly, and the gunpowder trigger pushes the transmission assembly after being triggered, and the pushed transmission assembly lifts the lock ring that is limited in the lock hole by the ratchet.

[0006] Furthermore, the lock body comprises a bottom plate and a cover plate which are fixedly connected, the lock core module is arranged between the interlayer of the bottom plate and the cover plate, and the safety trigger module is connected to the bottom plate and arranged on the outer surface of the lock body.

[0007] Furthermore, the ratchet and the safety lock hook are both rotatably connected to the cover plate and share a first rotating shaft; the lock core module also includes a pawl for locking the ratchet, and the pawl is rotatably connected to the cover plate via a second rotating shaft.

[0008] Furthermore, a flange is formed on the safety lock hook, which can be abutted by the ratchet, so that the ratchet can drive the safety lock hook to rotate.

[0009] Furthermore, a waist-shaped avoidance hole for avoiding the second rotating shaft is formed on the safety lock hook, and the second rotating shaft is movably engaged in the waist-shaped avoidance hole.

[0010] Furthermore, an inclined force-bearing portion is formed on the safety lock hook, so that the falling lock ring pushes the safety lock hook through the inclined force-bearing portion.

[0011] Furthermore, a tension spring is arranged on the ratchet to pull the ratchet that is not limited by the pawl; a pawl torsion spring is arranged on the pawl to position the pawl in a locking position to lock the ratchet; and a lock hook torsion spring is arranged on the safety lock hook to position the safety lock hook in an initial position that does not block the lock hole.

[0012] Furthermore, a limit stop foot is formed on the ratchet, and after the ratchet is released from the locking of the pawl, the limit stop foot blocks the resetting path of the pawl.

[0013] Furthermore, a cable connection hole is provided on the ratchet pawl; and a cable waist-shaped hole is provided on the safety lock hook.

[0014] Furthermore, the cover plate is also provided with a switch harness assembly cooperating with the pawl and the ratchet.

[0015] Furthermore, the gunpowder trigger is fixedly connected to the base plate; the transmission assembly includes a primary push rod and a secondary push rod, the primary push rod is rotatably connected to the base plate via a third rotating shaft, and the secondary push rod is rotatably connected to the base plate via a fourth rotating shaft, and the gunpowder trigger pushes the primary push rod to rotate after being triggered, and the primary push rod pushes the secondary push rod after rotating, and the secondary push rod pushes out the locking ring after rotating to lift the front cover and keep it in a semi-locked state.

[0016] Furthermore, the first-stage push rod is provided with a push rod torsion spring to position the first-stage push rod in an initial position before being pushed by the gunpowder trigger, and the second-stage push rod is provided with a push rod torsion spring to position the second-stage push rod in an initial position before being pushed by the first-stage push rod.

[0017] Based on the above technical solution, the technical effects that can be achieved by the utility model are:

[0018] The utility model provides a front cover lock. After the front vehicle collides with the pedestrian, the gunpowder trigger of the safety trigger module is triggered, and the gunpowder trigger pushes the transmission component. The transmission component lifts up the lock ring limited in the lock hole by the ratchet wheel. The lock ring and the front cover are fixedly connected. When the lock ring is lifted up by the transmission component, the front cover is also lifted up, which plays a role of buffering and unloading force. At the same time, the lifted lock ring pushes the ratchet wheel of the lock core module to rotate, and the pushed ratchet wheel drives the safety lock hook. The driven safety lock hook rotates and blocks the lock ring at the exit of the lock hole to limit the lock ring, thereby preventing the lock ring from completely escaping from the lock hole, that is, preventing the front cover from being completely lifted up. In summary, after the front vehicle collides with the pedestrian, the front cover lock of the utility model lifts the front cover to unload force through the gunpowder trigger, thereby eliminating or slowing down the impact force received by the pedestrian, realizing the pedestrian protection function, and at the same time, the lifting range of the front cover is limited by the safety lock hook to prevent the front cover from being excessively opened and affecting the driver's line of sight, thereby solving the technical problem that the front cover lock in the prior art cannot eliminate or slow down the physical damage caused to the pedestrian after the collision.

[0019] The front cover lock of the utility model can unlock the half-lock position through the inner opening cable connected to the actuator when the pedestrian protection function is not triggered, and release the safety hook through the safety hook cable connected to the actuator. The actuator drives the linear movement of the two cables to release the half-lock and full-lock of the front cover lock. The open and closed states of the lock body are identified by whether the ratchet wheel is in contact with the micro switch. When the lock body is in the half-lock and full-open positions, the micro switch is in a normally-off state, and the information is transmitted to the BCM in a timely manner.

[0020] The safety lock hook of the utility model can be hidden in the lock body along with the lock buckle when locked, thus solving the problem that the safety lock hook is too high to be arranged;

[0021] The front cover lock of the utility model realizes the pedestrian protection function of the front cover lock only by using the gunpowder igniter, the primary push rod and the secondary push rod, has a simple structure, a small single piece volume, a light weight, simple assembly and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the lock body of the front cover lock of the utility model;

[0023] Figure 2 It is a schematic diagram of the lock core module of the front cover lock of the utility model in a fully locked state;

[0024] Figure 3 It is a schematic diagram of the lock core module of the front cover lock of the utility model in a semi-locked state;

[0025] Figure 4 A schematic diagram of a safety lock hook of a lock core module of a front cover lock of the present invention;

[0026] Figure 5It is a schematic diagram of the safety trigger module of the front cover lock of the utility model;

[0027] Figure 6 It is a schematic diagram of a primary push rod and a secondary push rod of a safety trigger module of a front cover lock of the utility model.

[0028] In the utility model:

[0029] a-locking ring;

[0030] 1-lock body, 11-lock hole, 12-bottom plate, 121-bottom plate fixing installation hole, 122-first shaft hole, 123-second shaft hole, 124-gunpowder trigger installation hole, 125-third shaft hole, 126-fourth shaft hole, 127-push rod torsion spring fixing hole, 128-top rod torsion spring fixing hole, 13-cover plate, 131-cover plate fixing installation hole;

[0031] 2-lock core module, 21-ratchet, 211-first rotating shaft, 212-tension spring, 213-limiting foot, 22-safety lock hook, 221-flange, 222-waist-shaped avoidance hole, 223-inclined force-bearing part, 224-lock hook torsion spring, 225-cable waist-shaped hole, 23-pawl, 231-second rotating shaft, 232-pawl torsion spring, 233-cable connecting hole, 24-switch harness assembly;

[0032] 3-safety trigger module, 31-gunpowder trigger, 32-primary push rod, 321-third rotating shaft, 322-push rod torsion spring, 33-secondary push rod, 331-fourth rotating shaft, 332-push rod torsion spring. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0034] With the rapid development of the automobile industry, consumers have higher and higher requirements for automobile safety, especially in the case of vehicle front-end collision accidents, which have the highest frequency. If a collision with a pedestrian occurs, a more serious accident will occur. Therefore, it is necessary to add corresponding protection measures to increase collision protection for pedestrians, thereby eliminating or reducing the physical damage to pedestrians after a collision. The current bonnet lock only has the function of keeping the bonnet closed and not disengaged, and cannot eliminate or reduce the damage to pedestrians after a collision. The bonnet lock of the utility model can actively unlock the bonnet to a semi-locked position after a pedestrian is hit, and the bonnet lock can lift the car bonnet to a height of about 40mm within 4ms through the bonnet lock, while keeping the bonnet not opened, not disengaged from the bonnet lock and keeping it in a locked state. It can not only reduce or eliminate the fatal damage to pedestrians after a collision, but also keep the bonnet lock in a locked state, and ensure that the vehicle will not cause a secondary accident due to the lifted bonnet blocking the driver's line of sight.

[0035] like Figure 1-6 As shown, the utility model provides a bonnet lock with small size and light weight. The safety lock hook 22 can be hidden and sunken after being locked. The vehicle design space requirement is small and the bonnet lock is widely applicable to the layout design of various vehicle models. The bonnet lock meets the product functions and regulatory requirements and can provide active pedestrian protection for pedestrians in the event of a vehicle collision. Specifically, the bonnet lock is used to cooperate with the lock ring a on the front cover, and includes a lock body 1, a lock core module 2 and a safety trigger module 3. The lock body 1 includes a bottom plate 12 and a cover plate 13 fixedly connected. The lock core module 2 is arranged between the bottom plate 12 and the cover plate 13. The safety trigger module 3 is connected to the bottom plate 12 and is arranged on the outer surface of the connecting body.

[0036] In a specific embodiment of the present utility model, the lock body 1 is fixedly connected to the vehicle body, and the lock body 1 includes a base plate 12 and a cover plate 13 fixedly connected, specifically, they are fixedly connected by a first rotating shaft 211 and a second rotating shaft 231, a base plate fixing mounting hole 121 is provided on the base plate 12, and a cover plate fixing mounting hole 131 is provided on the cover plate 13, nuts are arranged in the above-mentioned base plate fixing mounting hole 121 and cover plate fixing mounting hole 131 to fix the lock body 1 to the vehicle body bracket, thereby fixing the lock body 1. Furthermore, the bottom plate 12 is provided with a first shaft hole 122 and a second shaft hole 123, which are used to install the first rotating shaft 211 and the second rotating shaft 231 respectively. The first rotating shaft 211 is provided with a ratchet 21, a safety lock hook 22 and a torsion spring of the safety lock hook 22, the ratchet 21 is provided with a tension spring 212, and the second rotating shaft 231 is provided with a pawl 23 and a pawl torsion spring 232; the bottom plate 12 is provided with a gunpowder trigger installation hole 124 for fixing the gunpowder trigger 31; the bottom plate 12 is provided with a micro switch fixing hole for fixing the switch Wiring harness assembly 24; a third shaft hole 125 is provided on the base plate 12 for installing the third rotating shaft 321, and the third rotating shaft 321 is provided with a first-level push rod 32 and a push rod torsion spring 322; a fourth shaft hole 126 is provided on the base plate 12 for installing the fourth rotating shaft 331, and the fourth rotating shaft 331 is provided with a second-level push rod 33 and a push rod torsion spring 332; at the same time, a push rod torsion spring 322 fixing hole 127 and a push rod torsion spring 332 fixing hole 128 are provided on the base plate 12 for fixing the push rod torsion spring 322 and the push rod torsion spring 332 respectively.

[0037] Working reasons of pedestrian protection and movement process of parts:

[0038] like Figure 5-6 The figure shows a schematic diagram of the safety trigger module 3 of the front cover lock of the utility model. The safety trigger module 3 includes a gunpowder trigger 31, a primary push rod 32, a push rod torsion spring 322, a third rotation shaft 321, a secondary push rod 33, a push rod torsion spring 332 and a fourth rotation shaft 331 installed on the bottom plate 12. The gunpowder trigger 31 is fixed to the bottom plate 12 by two screws, and the bottom plate 12 is fixed to the vehicle body by three M6 screws. When a pedestrian is hit, the force sensor at the front end of the vehicle transmits a force signal to the BCM. The BCM triggers the gunpowder trigger 31 after identifying that the trigger condition is met. After the gunpowder trigger 31 is detonated, it impacts the first-level push rod 32 to rotate clockwise. During the rotation, the first-level push rod 32 pushes the second-level push rod 33 to rotate counterclockwise and supports the second-level push rod 33 in the limit position. When the second-level push rod 33 rotates counterclockwise, the lock ring a is lifted to lift the front cover and keep it in the semi-locked position, and the lock ring a is supported between the second-level push rod 33 and the safety lock hook 22. The lock ring a drives the front cover to rise to a height of 43 mm, providing a buffer space for the impact of pedestrians. The entire movement process can be completed within 4ms of the pedestrian being impacted, providing a buffer when the pedestrian is hit for the first time.

[0039] The working principle and process of the front cover lock of the utility model when the pedestrian protection function is not triggered:

[0040] like Figure 2-4 As shown, the lock core module 2 includes a ratchet 21 mounted on the cover plate 13, a tension spring 212, a first rotating shaft 211, a safety lock hook 22, a torsion spring of the safety lock hook 22, a pawl 23, a pawl torsion spring 232, a second rotating shaft 231 and a switch harness assembly 24.

[0041] In the fully locked state, the pawl 23 is provided with a cable connection hole 233, and the cable connection hole 233 is matched with a cable. When the cable is pulled by an external force, the pawl 23 will rotate counterclockwise. When it rotates to the stroke angle, the pawl 23 is separated from the contact position with the ratchet 21. The ratchet 21 rotates clockwise under the tension of the tension spring 212 until it reaches the limit position of the ratchet 21 and stops. While the ratchet 21 rotates, it pushes the lock ring a to move straight upward, releasing the lock ring a to the half-locked position. At this time, since the safety lock hook 22 is formed with a flange 221 that can be abutted by the ratchet 21, the safety lock The hook 22 will also rotate with the ratchet 21 until it reaches the limit position and then stops rotating. The inclined force-bearing portion 223 formed on the safety lock hook 22 limits the lock ring a to the semi-locked position. At the same time, since the limit stop foot 213 is formed on the ratchet 21, after the ratchet 21 is released from the lock of the pawl 23, the limit stop foot 213 blocks the reset path of the pawl 23 to prevent the pawl 23 from resetting the ratchet 21 in the reverse direction, thereby keeping the ratchet 21 supporting the safety lock hook 22. This process is the working principle and process of the front cover lock of the utility model when the pedestrian protection function is not triggered.

[0042] When in the half-locked position, a cable waist-shaped hole 225 is provided on the end of the safety lock hook 22 away from the lock hole 11. The cable waist-shaped hole 225 cooperates with the cable. When the cable is pulled by an external force, the safety lock hook 22 will rotate counterclockwise, and the lock ring a will be ejected out of the lock body 1 due to being free from the restriction of the safety lock hook 22, reaching the fully unlocked position. This process is the full unlocking working principle and process of the front cover lock of the utility model when the pedestrian protection function is not triggered;

[0043] When the front cover needs to be closed, the lock ring a first contacts the safety lock hook 22, specifically the inclined force-bearing portion formed on the safety lock hook 22, during the process of the front cover falling. The lock ring a follows the inclined force-bearing portion into the semi-locked position and continues to descend, pressing the ratchet 21 and the safety lock hook 22 into the fully locked position together. At this time, the ratchet 21 is restrained in the fully locked position by the pawl 23 and remains in the fully locked position under the action of the torsion spring of the ratchet 21. At the same time, the ratchet 21 is fixed in the fully locked position, and the ratchet 21 fixes the lock ring a in the fully locked position. Because the lock ring a is fixed on the lock buckle base plate 12 fixedly connected to the front cover, the function and process of completely closing and maintaining the front cover of the car is realized.

[0044] Lock body 1 signal feedback principle:

[0045] like Figure 2 As shown, there is a micro switch sub-part in the switch harness assembly 24, and the micro switch is a normally-on switch. When the lock body 1 is locked, the pawl 23 has no contact with the micro switch, and the micro switch remains unblocked; when unlocking, the pawl 23 is pulled counterclockwise by the cable to the unlocking position. At this time, the ratchet 21 rotates clockwise under the action of the tension spring 212 to block the automatic return of the ratchet 21. The ratchet 21 will hit the micro switch at this time, and the micro switch will change from normally on to normally off. The change of the micro switch information signal will be fed back to the BCM through the wiring harness and the connector, thereby providing a warning that the front cover lock is not locked after unlocking.

[0046] Hidden principle and movement process of safety lock hook 22:

[0047] like Figure 4 As shown, during the locking process, the lock ring a first contacts the inclined force-bearing portion 223 of the safety lock hook 22. During the process of the lock ring a being pressed from top to bottom, the safety lock hook 22 rotates counterclockwise along the first rotating shaft 211. Since the safety lock hook 22 is provided with a waist-shaped avoidance hole 222, the safety lock hook 22 can rotate continuously during the counterclockwise locking process without being interfered by the second rotating shaft 231 until it is completely hidden in the interlayer of the bottom plate 12 and the cover plate 13, thereby achieving a hidden effect. This structural design is significantly different from the transmission structure, and saves a lot of assembly space for the arrangement of the lock body 1.

[0048] It should be understood that the specific embodiments described above are only used to explain the present invention, and are not used to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A front cover lock, used to cooperate with a lock ring (a) fixed on the front cover, characterized in that: include: A lock body (1), the lock body (1) being fixedly connected to the vehicle body, and the lock body (1) being formed with a lock hole (11) for receiving the lock ring (a); A lock core module (2), the lock core module (2) comprising a ratchet (21) and a safety lock hook (22), the ratchet (21) limiting the lock ring (a) in the lock hole (11), the lock ring (a) being pushed when being lifted up, the pushed ratchet (21) driving the safety lock hook (22), the driven safety lock hook (22) blocking the lock ring (a) at the exit of the lock hole (11) to limit the lock ring (a); A safety trigger module (3), the safety trigger module (3) comprising a gunpowder trigger (31) and a transmission assembly, the gunpowder trigger (31) pushing the transmission assembly after being triggered, the pushed transmission assembly lifting the lock ring (a) which is restrained in the lock hole (11) by the ratchet (21).

2. The front cover lock according to claim 1, characterized in that: The lock body (1) comprises a base plate (12) and a cover plate (13) which are fixedly connected, the lock core module (2) is arranged between the interlayer of the base plate (12) and the cover plate (13), and the safety trigger module (3) is connected to the base plate (12) and arranged on the outer surface of the lock body (1).

3. The front cover lock according to claim 2, characterized in that: The ratchet (21) and the safety lock hook (22) are both rotatably connected to the cover plate (13) and share a first rotating shaft (211); the lock core module (2) also includes a pawl (23) for locking the ratchet (21), and the pawl (23) is rotatably connected to the cover plate (13) via a second rotating shaft (231).

4. The front cover lock according to claim 3, characterized in that: The safety lock hook (22) is formed with a flange (221) against which the ratchet (21) can abut, so that the ratchet (21) can drive the safety lock hook (22) to rotate.

5. The front cover lock according to claim 3, characterized in that: A waist-shaped avoidance hole (222) for avoiding the second rotating shaft (231) is formed on the safety lock hook (22), and the second rotating shaft (231) is movably fitted in the waist-shaped avoidance hole (222).

6. The front cover lock according to claim 3, characterized in that: An inclined force-bearing portion (223) is formed on the safety lock hook (22), so that the falling lock ring (a) pushes the safety lock hook (22) through the inclined force-bearing portion (223).

7. The front cover lock according to claim 3, characterized in that: The ratchet (21) is provided with a tension spring (212) for pulling the ratchet (21) that is not limited by the pawl (23); the pawl (23) is provided with a pawl torsion spring (232) for positioning the pawl (23) at a locking position for locking the ratchet (21); and the safety lock hook (22) is provided with a lock hook torsion spring (224) for positioning the safety lock hook (22) at an initial position that does not block the lock hole (11).

8. The front cover lock according to claim 3, characterized in that: A limit stop foot (213) is formed on the ratchet (21), and after the ratchet (21) is released from the locking of the pawl (23), the limit stop foot (213) blocks the return path of the pawl (23).

9. The front cover lock according to claim 3, characterized in that: The ratchet (23) is provided with a cable connection hole (233); and the safety lock hook (22) is provided with a cable waist-shaped hole (225).

10. The front cover lock according to claim 3, characterized in that: The cover plate (13) is also provided with a switch harness assembly (24) that cooperates with the pawl (23) and the ratchet (21).

11. The front cover lock according to claim 2, characterized in that: The gunpowder trigger (31) is fixedly connected to the base plate (12); the transmission assembly comprises a primary push rod (32) and a secondary push rod (33); the primary push rod (32) is rotatably connected to the base plate (12) via a third rotating shaft (321); the secondary push rod (33) is rotatably connected to the base plate (12) via a fourth rotating shaft (331); when the gunpowder trigger (31) is triggered, the primary push rod (32) is pushed to rotate; when the primary push rod (32) rotates, the secondary push rod (33) is pushed; when the secondary push rod (33) rotates, the locking ring (a) is pushed out to lift the front cover and keep it in a semi-locked position.

12. The front cover lock according to claim 11, characterized in that: The primary push rod (32) is provided with a push rod torsion spring (322) to position the primary push rod (32) at an initial position before being pushed by the gunpowder trigger (31), and the secondary push rod (33) is provided with a push rod torsion spring (332) to position the secondary push rod (33) at an initial position before being pushed by the primary push rod (32).

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