Double-pulling front cover lock with active pedestrian protection function

Abstract

The invention relates to the technical field of automobile parts, in particular to a double-pull front cover lock with an active pedestrian protection function, gunpowder of a gunpowder trigger assembly triggers an extension rod to extend out of an assembly main body, the extending extension rod pushes a stress section abutting against the extension rod to enable a push rod to rotate, an unlocking limited section of the rotating push rod pushes a pawl, and the unlocking limited section of the rotating push rod pushes the pawl to enable the assembly main body to rotate. The pushed pawl overcomes the rotating force of the pawl to rotate reversely, limitation on the ratchet wheel is relieved, the lock ring is not limited by the ratchet wheel any more, the ejector rod rotates under the action of the rotating force of the ejector rod to eject the lock ring out of the lock groove, the pawl and the ratchet wheel rotate under the action of the rotating force of the ejector rod, the pawl and the ratchet wheel enter the interlocking state again, and the front cover lock enters the semi-locking state. And the pawl in the half-locking state reversely limits the unlocking limited section of the rotated push rod to prevent the push rod from resetting, so that the lock ring is prevented from falling and resetting. The front cover lock solves the technical problems that an existing front cover lock only has the function of keeping a front cover closed and not disengaged, and cannot achieve buffering during collision.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, in particular to a double-pull front cover lock with an active pedestrian protection function. Background Art

[0002] With the rapid development of the automobile industry, consumers have higher and higher requirements for automobile safety, especially in the case of front-end collision accidents, which are the most frequent. If a collision occurs with a pedestrian, 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 caused to pedestrians after a collision. The current hood lock only has the function of keeping the hood closed and not disengaged, and cannot eliminate or reduce the damage caused to pedestrians after a collision. Therefore, it is necessary to design a hood lock that can actively unlock the hood to a half-locked position after a pedestrian is hit, which plays a certain degree of buffering role, while keeping the hood from opening, not disengaging from the hood lock and keeping it locked, to ensure that the hood does not block the driver's view due to the tilted hood. Summary of the invention

[0003] In order to solve the technical problem that the existing front cover lock only has the function of keeping the front cover closed and not detached, and cannot play a buffering role in collision, the present application proposes a double-pull front cover lock with active pedestrian protection function to solve the above technical problem.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] The present invention provides a double-pull front cover lock with active pedestrian protection function, comprising: a lock box, which is detachably connected to a vehicle body; a pawl and a ratchet, which are both rotatably arranged on the lock box, and the pawl and the ratchet both have rotational force. Under the action of the rotational force and external force, the pawl and the ratchet form a three-stage interlocking to enable the front cover lock to switch between a fully locked state, a half-locked state and a fully open state, and a lock groove is formed on the ratchet to limit a lock ring on the front cover in a fully locked state, and at the same time, a lock hook is also formed on the ratchet along a direction in which the lock ring escapes from the lock groove to limit the lock ring in a half-locked state; a gunpowder trigger assembly, which is arranged on the lock box, and the gunpowder trigger assembly includes an assembly body and an extension rod that can extend from the assembly body, and the gunpowder trigger assembly will trigger the gunpowder and allow the extension rod to extend from the assembly body after receiving a signal of a vehicle body collision; an ejection rod, which is rotatably arranged on the lock box When the locking cam is in the fully locked state, the locking cam is pressed against the locking ring by the pawl, and the locking cam is released from the locking groove by the pawl.

[0006] Furthermore, it also includes an ejector rod limiting assembly, the ejector rod limiting assembly includes: a fixed rod, the fixed rod is assembled on the lock box, one end of the fixed rod is sleeved on the rotating shaft of the ratchet, and the end is formed with a yielding arc portion for the ejector rod to rotate and a limiting edge portion adjacent to the yielding arc portion for limiting the ejector rod, the other end of the fixed rod is sleeved on the rotating shaft of the push rod, and a recessed portion is formed in the middle section of the fixed rod;

[0007] a first limiting flange, which is formed by folding the main body of the ejector rod and extending along the axial direction of the rotating shaft of the ejector rod, wherein a portion of the first limiting flange abuts against the yielding arc portion and the limiting edge portion of the fixing rod, and when the ejector rod is ejected to the limit position, the first limiting flange is limited by the limiting edge portion so that the rod body of the ejector rod stops on the reset path of the locking ring;

[0008] The second limiting flange is formed by folding the main body of the ejector rod and extending along the axial direction of the rotating shaft of the ejector rod. Before the gunpowder is triggered, the second limiting flange of the ejector rod stops at the makeshift space formed by the recessed portion of the fixing rod. After the gunpowder is triggered, the second limiting flange is reversely supported by the supporting section of the rotated push rod, so that the ejector rod always supports the locking ring to prevent the locking ring from resetting.

[0009] Furthermore, the pawl is formed with a protrusion on one side of the middle section of the fixing rod away from the recessed portion, and the protrusion extends axially along the rotation axis of the pawl. After the gunpowder is triggered, the unlocking restricted section of the push rod drives the pawl to rotate by pushing the protrusion.

[0010] Furthermore, it also includes a switch harness assembly configured on the lock box, the switch harness assembly is electrically connected to the body control module BCM, and at the same time, the plastic-coated part of the ratchet is formed as a push rod, and the push rod displays the state of the front cover lock on the body control module BCM by pressing the micro switch on the switch harness assembly.

[0011] Furthermore, the lock box includes a cover plate and a bottom plate that are assembled together, and an assembly area is formed between the cover plate and the bottom plate to assemble the pawl, ratchet, gunpowder trigger assembly, ejection rod, push rod, fixing rod and switch harness assembly.

[0012] Furthermore, an open groove is formed on the bottom plate to receive the gunpowder trigger assembly.

[0013] Furthermore, claw hooks and pressure blocks are formed at both ends of the engaging opening of the pawl, and the ratchet is sequentially formed with a first locking tooth, a second locking tooth, a stopper and the locking hook along the rotation direction;

[0014] In the fully locked state, the claw hook of the pawl and the first tooth of the ratchet wheel abut against each other to form an interlocking state, and by applying a first external force to the pawl, the pawl overcomes its own rotational force and rotates in the opposite direction, and the reverse rotation of the pawl causes the first tooth to disengage from the claw hook, and the pawl continues to rotate until the pressure block of the pawl is pressed against the stopper of the ratchet wheel and is limited to no longer rotate, and the external force applied to the pawl is released, and the pawl is reset under the action of the rotational force, so that the second tooth of the ratchet wheel rotated under the action of the rotational force and the pawl abut against each other to form an interlocking state;

[0015] At this point, the front cover lock enters a semi-locked state from a fully locked state, and a second external force is applied to the pawl, causing the pawl to overcome its own rotational force and rotate in the opposite direction. The reverse rotation of the pawl causes the second tooth to disengage from the pawl hook, and the external force applied to the pawl is released. The pawl and the ratchet wheel rotate under the action of their respective rotational forces until the pressure block of the pawl and the lock hook arm of the lock hook of the ratchet wheel abut against each other to form an interlocking, and the front cover lock enters a fully open state from a semi-locked state.

[0016] Furthermore, a cable is connected to the pawl.

[0017] Furthermore, the first external force exerted on the pawl is applied by the cable or the push rod; and the second external force exerted on the pawl is applied by the cable.

[0018] Furthermore, the rotational forces of the pawl, the ratchet, the ejection rod and the push rod are all provided by corresponding torsion springs or springs arranged on the lock box.

[0019] Based on the above technical solution, the technical effects that can be achieved by the present invention are:

[0020] The double-pull hood lock with active pedestrian protection function of the present application, when the vehicle body hits a pedestrian in the fully locked state, the vehicle body will send a signal to the body control module BCM, and the body control module BCM will control the gunpowder trigger of the gunpowder trigger assembly to allow the extension rod to extend out of the assembly body, and the extended extension rod pushes the force-bearing section against the extension rod to rotate, and the unlocking restricted section of the rotating push rod pushes the pawl, and the pushed pawl overcomes its own rotational force and rotates in the opposite direction to release the restriction on the ratchet. At this time, the lock ring is no longer restricted by the ratchet, and the ejector rod rotates under the action of its own rotational force to eject the lock ring out of the lock groove. At the same time, the pawl and the ratchet rotate under the action of their respective rotational forces, and the pawl and the ratchet enter the interlocking state again, and the hood lock enters the semi-locked state. The pawl in the semi-locked state reversely limits the unlocking restricted section of the rotating push rod to prevent the push rod from resetting, thereby preventing the lock ring from falling and resetting, that is, ensuring that the car hood connected to the lock ring is always at the lifting height of the semi-locked state. In summary, the double-pull front cover lock with active pedestrian protection function of the present application can actively unlock the front cover lock to the semi-locked state after the pedestrian is hit, and the front cover lock can lift the car hood to a height of about mm within ms through the front cover lock, while keeping the front cover not opened, the front cover and the front cover lock are not separated and remain in the locked state, which can not only reduce or eliminate the fatal injuries of pedestrians after the collision, but also keep the front cover lock in the locked state, and ensure that the vehicle will not cause a secondary accident due to the excessive lifting of the front cover blocking the driver's line of sight;

[0021] The double-pull front cover lock with active pedestrian protection function of the present application, in order to ensure that the ejection rod is in the correct position, if the lock ring is disengaged, the ejection rod still has to support the lock ring to prevent the lock ring from resetting, and the support section of the push rod that is locked by the pawl after rotation supports the second limit flange of the ejection rod, thereby supporting the ejection rod and preventing the ejection rod from resetting, that is, ensuring that the lock ring pressed on the ejection rod cannot be reset, and the front cover connected to the lock ring is always in a semi-locked state to ensure safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the double-pull front cover lock with active pedestrian protection function of the present application;

[0023] Figure 2 A schematic diagram of another perspective of the double-pull front cover lock with active pedestrian protection function of the present application;

[0024] Figure 3 A schematic diagram of another perspective of the double-pull front cover lock with active pedestrian protection function of the present application;

[0025] Figure 4 A schematic diagram of a lock box of a double-pull front cover lock with active pedestrian protection function of the present application;

[0026] Figure 5 A schematic diagram of a lock box of a double-pull front cover lock with active pedestrian protection function of the present application from another perspective;

[0027] Figure 6 A schematic diagram of the double-pull front cover lock with active pedestrian protection function of the present application in a fully locked state;

[0028] Figure 7 A schematic diagram of the double-pull front cover lock with active pedestrian protection function of the present application in a semi-locked state;

[0029] Figure 8 A schematic diagram of the double-pull front cover lock with active pedestrian protection function of the present application in a fully open state;

[0030] Fig. 9 A schematic diagram of the ratchet and pawl of the double-pull front cover lock with active pedestrian protection function of the present application in a fully locked state;

[0031] Fig.10 A schematic diagram of a ratchet and a pawl during a first process in which a double-pull front cover lock with an active pedestrian protection function of the present application changes from a fully locked state to a semi-locked state;

[0032] Fig.11 A schematic diagram of the ratchet and the pawl during the second process of the double-pull front cover lock with active pedestrian protection function of the present application changing from a fully locked state to a semi-locked state;

[0033] Fig.12 A schematic diagram of the ratchet and pawl of the double-pull front cover lock with active pedestrian protection function of the present application in a semi-locked state;

[0034] Fig.13 A schematic diagram of a push rod and an ejection rod of a double-pull front cover lock with active pedestrian protection function of the present application before the gunpowder is triggered;

[0035] Fig.14 A schematic diagram of the double-pull front cover lock with active pedestrian protection function of the present application, in which the push rod and the ejection rod are in a rotating state after the gunpowder is triggered;

[0036] Fig.15 This is a schematic diagram of the double-pull front cover lock with active pedestrian protection function of the present application, in which the push rod and the ejection rod are in a stable state after the gunpowder is triggered.

[0037] Among them: 100-locking ring;

[0038] 1-lock box, 11-cover plate, 111-micro switch fixing hole, 112-oblique groove, 113-cable fixing hole, 12-bottom plate, 121-opening groove, 122-V-shaped groove, 123-gunpowder trigger assembly mounting hole, 124-push rod rivet shaft hole, 125-annular hole, 13-connecting ear, 14-pawl rivet shaft hole, 15-ratchet rivet shaft hole;

[0039] 2- ratchet, 21- protrusion, 22-claw hook, 23-pressing block;

[0040] 3-ratchet, 31-locking groove, 32-locking hook, 321-locking hook arm, 33-pressing rod, 34-first latching tooth, 35-second latching tooth, 36-stopper;

[0041] 4-gunpowder trigger assembly, 41-assembly body, 42-extension rod;

[0042] 5- ejector rod, 51- first limit flange, 52- second limit flange;

[0043] 6-push rod, 61-force section, 62-support section, 63-unlocking restricted section;

[0044] 7-fixing rod, 71-yielding arc portion, 72-limiting edge portion, 73-recessed portion;

[0045] 8-Switch wiring harness assembly. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0049] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0050] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0051] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0052] like Figure 1-15 As shown, the present application provides a double-pull front cover lock with active pedestrian protection function, including a lock box 1, a pawl 2, a ratchet 3, a gunpowder trigger assembly 4, an ejection rod 5 and a push rod 6. The lock box 1 is detachably connected to the vehicle body, and the pawl 2 and the ratchet 3 are rotatably arranged on the lock box 1. The pawl 2 and the ratchet 3 both have their own rotational force. Under the action of the rotational force and the external force, the pawl 2 and the ratchet 3 form a three-stage interlocking to enable the front cover lock to switch between the fully locked, half-locked and fully open states. A lock groove 31 is formed on the ratchet 3 to limit the lock ring 100 on the front cover in the fully locked state. At the same time, the ratchet A lock hook 32 is formed along the direction in which the lock ring 100 escapes from the lock groove 31 for limiting the lock ring 100 in the semi-locked state. The gunpowder trigger assembly 4 is arranged on the lock box 1. The gunpowder trigger assembly 4 includes an assembly body 41 and an extension rod 42 that can extend out of the assembly body 41. After receiving a signal of a vehicle body collision, the gunpowder trigger assembly 4 triggers the gunpowder and allows the extension rod 42 to extend out of the assembly body 41. The ejector rod 5 is rotatably arranged on the lock box 1 and shares a rotating shaft with the pawl 2. The ejector rod 5 has its own rotational force. In the fully locked state, the ejector rod 5 is pressed by the lock ring 100, as shown in FIG. Fig.13As shown, after the lock ring 100 is released from restriction, under the action of the rotational force, the ejection rod 5 rotates to push the lock ring 100 out of the lock groove 31, and the push rod 6 is rotatably arranged on the lock box 1. The push rod 6 is formed with a force-bearing section 61, a supporting section 62 and an unlocking restricted section 63 along the rotation direction. The push rod 6 has its own rotational force. Under the action of the rotational force, the force-bearing section 61 of the push rod 6 abuts against the extension rod 42. After the gunpowder is triggered, the extension rod 42 pushes the force-bearing section 61 to rotate the push rod 6. As the push rod 6 rotates, the unlocking restricted section 63 pushes the pawl 2 to release the restriction on the ratchet 3. After the restriction is released, the ratchet 3 releases the restriction on the lock ring 100. Fig.14 As shown, the pawl 2 and the ratchet wheel 3 enter the interlocking state again, and the front cover lock enters the semi-locking state from the fully locked state. The pawl 2 in the semi-locked state reversely limits the unlocking restricted section 63 of the rotating push rod 6 to prevent the push rod 6 from resetting. Fig.15 shown.

[0053] The double-pull front cover lock with active pedestrian protection function of the present application, when the vehicle body hits a pedestrian in the fully locked state, the vehicle body will send a signal to the body control module BCM, and the body control module BCM controls the gunpowder trigger of the gunpowder trigger assembly 4 to allow the extension rod 42 to extend out of the assembly body 41, and the extended extension rod 42 pushes the force-bearing section 61 against the extension rod 42, so that the push rod 6 rotates, and the unlocking restricted section 63 of the rotating push rod 6 pushes the pawl 2, and the pushed pawl 2 overcomes its own rotational force and rotates in the opposite direction to release the restriction on the ratchet 3. At this time, the lock ring 100 is no longer restricted by the ratchet 3, and the ejector rod 5 rotates under the action of its own rotational force to eject the lock ring 100 out of the lock groove 31. At the same time, the pawl 2 and the ratchet 3 rotate under the action of their respective rotational forces, and the pawl 2 and the ratchet 3 enter the interlocking state again. The bonnet lock enters a semi-locked state, and the bonnet lock enters a semi-locked state. The pawl 2 in the semi-locked state reversely limits the unlocking restricted section 63 of the rotated push rod 6 to prevent the push rod 6 from resetting, thereby preventing the lock ring 100 from falling and resetting, i.e., ensuring that the car bonnet connected to the lock ring 100 is always at a lifted height in the semi-locked state. In summary, the double-pull bonnet lock with active pedestrian protection function of the present application can actively unlock the bonnet lock to a semi-locked state after a pedestrian is hit, and lift the car bonnet to a height of about 40mm within 4ms through the bonnet lock, while keeping the bonnet from opening, and the bonnet and bonnet lock do not separate and remain in a locked state. This can not only reduce or eliminate fatal injuries to pedestrians after a collision, but also keep the bonnet lock in a locked state, and ensure that the vehicle will not suffer a secondary accident caused by the bonnet being lifted up too much and blocking the driver's line of sight.

[0054] In order to ensure that the ejector rod 5 is in the correct position, such as after the lock ring 100 is disengaged, the ejector rod 5 still has to support the lock ring 100 to prevent the lock ring 100 from resetting. In order to meet the above requirements, the double-pull front cover lock with active pedestrian protection function of the present application also includes an ejector rod limiting assembly, the ejector rod limiting assembly includes a fixed rod 7, a first limiting flange 51 and a second limiting flange 52, the fixed rod 7 is assembled on the lock box 1, one end of the fixed rod 7 is sleeved on the rotating shaft of the pawl 2, and a yield arc portion 71 for the ejector rod 5 to rotate and a stopper adjacent to the yield arc are formed on the end. The limiting edge 72 of the portion 71 is used to limit the ejection rod 5. The other end of the fixed rod 7 is sleeved on the rotation axis of the push rod 6. A recessed portion 73 is formed in the middle section of the fixed rod 7. The first limiting flange 51 is formed by folding the main body of the ejection rod 5 and extending along the axial direction of the rotation axis of the ejection rod 5. Part of the first limiting flange 51 abuts against the yielding arc portion 71 and the limiting edge 72 of the fixed rod 7. When the ejection rod 5 is ejected to the limit position, the first limiting flange 51 is limited by the limiting edge 72 so that the rod body of the ejection rod 5 stops on the reset path of the locking ring 100. Fig.15 As shown in the figure, in order to enable the push rod 6 to better push the pawl 2, the pawl 2 is formed with a protrusion 21 on one side of the middle section of the fixed rod 7 away from the recessed portion 73, and the protrusion 21 extends out along the axial direction of the rotation axis of the pawl 2. After the gunpowder is triggered, the unlocking restricted section 63 of the push rod 6 drives the pawl 2 to rotate by pushing the protrusion 21. The first limiting flange 51 is formed by folding the main body of the ejection rod 5 and extending along the axial direction of the rotation axis of the ejection rod 5. Part of the first limiting flange 51 abuts against the yielding arc portion 71 of the fixed rod 7 and the limiting flange 51. When the ejector rod 5 is ejected to the limit position, the first limiting flange 51 is limited by the limiting flange 72 so that the rod body of the ejector rod 5 rests on the reset path of the lock ring 100. The second limiting flange 52 is formed by folding the main body of the ejector rod 5 and extending along the axial direction of the rotating shaft of the ejector rod 5. Before the gunpowder is triggered, the second limiting flange 52 of the ejector rod 5 rests in the make-away space formed by the recessed portion 73 of the fixing rod 7. After the gunpowder is triggered, the second limiting flange 52 is reversely supported by the supporting section 62 of the rotating push rod 6. Fig.15 As shown, the ejection rod 5 always supports the locking ring 100 to prevent the locking ring 100 from being reset.

[0055] In order to enable the push rod 6 to better push the pawl 2, a protrusion 21 is formed on the side of the middle section of the fixed rod 7 away from the recessed portion 73 of the pawl 2. The protrusion 21 extends axially along the rotating axis of the pawl 2. After the gunpowder is triggered, the unlocking restricted section 63 of the push rod 6 drives the pawl 2 to rotate by pushing the protrusion 21.

[0056] The double-pull hood lock with active pedestrian protection function of the present application also includes a switch harness assembly 8 configured on the lock box 1, and the switch harness assembly 8 is electrically connected to the body control module BCM. At the same time, the plastic-coated part of the ratchet 3 is formed into a push rod 33, and the push rod 33 displays the state of the hood lock on the body control module BCM by pressing the micro switch on the switch harness assembly 8. Specifically, the micro switch of the switch harness assembly 8 is a normally-on switch. When the lock body is in a fully locked state, the push rod 33 of the ratchet 3 has no contact with the micro switch, and the micro switch remains in a smooth state. When unlocking, the pawl 2 rotates to the unlocking position under the action of external force. At this time, the ratchet 3 rotates under the action of its own rotational force to block the automatic return of the pawl 2. At this time, the push rod 33 of the ratchet 3 will hit the micro switch, 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 body control module BCM through the harness and the connector, thereby providing a warning that the hood lock is not locked after unlocking.

[0057] The two ends of the engagement opening of the ratchet 2 of the double-pull front cover lock with active pedestrian protection function of the present application are respectively formed with a claw hook 22 and a pressure block 23, and the ratchet 3 is sequentially formed with a first latch tooth 34, a second latch tooth 35, a stopper 36 and a lock hook 32 along the rotation direction;

[0058] like Figure 6 and 9 As shown, in the fully locked state, the claw hook 22 of the pawl 2 and the first latching tooth 34 of the ratchet wheel 3 abut against each other to form an interlocking state, as shown in FIG. Figure 10-12 As shown, by applying a first external force to the pawl 2, the pawl 2 overcomes its own rotational force and rotates in the reverse direction, and the pawl 2 rotates in the reverse direction to make the first locking tooth 34 escape from the claw hook 22, and the pawl 2 continues to rotate until the pressing block 23 of the pawl 2 is pressed onto the stopper 36 of the ratchet wheel 3 and is limited and no longer rotates, and the external force applied to the pawl 2 is released, and the pawl 2 is reset under the action of the rotational force, so that the second locking tooth 35 of the ratchet wheel 3 rotating under the action of the rotational force and the pawl 2 abut against each other to form an interlocking;

[0059] So far, if Figure 7 and 12 As shown, the front cover lock enters the semi-locked state from the fully locked state, and a second external force is applied to the pawl 2, so that the pawl 2 overcomes its own rotational force and rotates in the opposite direction. The pawl 2 rotates in the opposite direction so that the second latching tooth 35 escapes from the pawl hook 22, and the external force applied to the pawl 2 is released. The pawl 2 and the ratchet 3 rotate under the action of their respective rotational forces until the pressure block 23 of the pawl 2 and the lock hook arm 321 of the lock hook 32 of the ratchet 3 abut against each other to form an interlocking state, as shown in FIG. Figure 8 As shown, the front cover lock changes from a half-locked state to a fully open state.

[0060] In a specific embodiment of the present invention, a cable is connected to the pawl 2 .

[0061] In a specific embodiment of the present invention, the first external force exerted on the pawl 2 is applied by the cable or the push rod 6, so that the front cover lock enters a semi-locked state from a fully locked state; the second external force exerted on the pawl 2 is applied by the cable, so that the front cover lock enters a fully open state from a semi-locked state.

[0062] In a specific embodiment of the present invention, the rotational forces of the pawl 2 , the ratchet wheel 3 , the ejection rod 5 and the push rod 6 are all provided by corresponding torsion springs or springs disposed on the lock box 1 .

[0063] The lock box 1 of the double-pull front cover lock with active pedestrian protection function of the present application includes a spliced ​​cover plate 11 and a bottom plate 12, and an assembly area is formed between the cover plate 11 and the bottom plate 12 to assemble the pawl 2, the ratchet 3, the gunpowder trigger assembly 4, the ejection rod 5, the push rod 6, the fixing rod 7 and the assembly space of the switch harness assembly 8. Specifically, connecting ears 13 are arranged on the upper parts of both sides of the lock box 1, and mounting holes are opened on the connecting ears 13. The lock box 1 is screwed on the vehicle body bracket through the connecting ears 13, and also serves the function of fixing the lock box 1. The lock box 1 is provided with a pawl rivet shaft hole 14 and a ratchet rivet shaft hole 15, which are respectively used to install and fix the pawl rotating shaft and the ratchet rotating shaft. The pawl rotating shaft is equipped with a pawl 2, a ratchet torsion spring, an ejector rod 5 and a fixing rod 7, and the ratchet rotating shaft is equipped with a ratchet 3 and a ratchet torsion spring. The cover plate 11 is provided with a micro switch fixing hole 111 for fixing the switch wiring harness assembly 8, the cover plate 11 is provided with an oblique groove 112 for fixing the spring leg of the ratchet torsion spring, and the cover plate 11 is provided with a cable fixing hole 113. A V-shaped groove 122 is provided on the base plate 12 for fixing the ejector rod spring, and the other end of the ejector rod spring is fixed on the ejector rod 5. A gunpowder trigger assembly mounting hole 123 is provided on the base plate 12 for fixing the gunpowder trigger riveting shaft, and the gunpowder trigger assembly 4 is fixed on the gunpowder trigger riveting shaft. A push rod rivet shaft hole 124 is provided on the base plate 12 for installing the push rod rivet shaft, and the push rod 6, the fixing rod 7 and the push rod torsion spring are assembled on the push rod rivet shaft. An annular hole 125 is provided on the base plate 12 for fixing the spring leg of the push rod torsion spring. An opening groove 121 is provided on the base plate 12. The opening portion of the opening groove 121 parallel to the mounting surface direction is used to avoid the installation of the gunpowder trigger assembly 4, and the opening portion of the opening groove 121 perpendicular to the mounting surface direction is used to support the tail end of the gunpowder trigger assembly 4, so as to provide sufficient supporting force in the direction perpendicular to the mounting surface when the gunpowder trigger assembly 4 is triggered.

[0064] 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 protection scope of the present invention.

Claims

1. A double-pull front cover lock with active pedestrian protection function, characterized in that: include: A lock box (1), wherein the lock box (1) is detachably connected to the vehicle body; A pawl (2) and a ratchet (3), wherein the pawl (2) and the ratchet (3) are both rotatably arranged on the lock box (1), and the pawl (2) and the ratchet (3) are both provided with rotational force. Under the action of the rotational force and external force, the pawl (2) and the ratchet (3) form a three-stage interlocking so that the front cover lock can be switched between a fully locked state, a half-locked state and a fully open state. A locking groove (31) is formed on the ratchet (3) for limiting the locking ring (100) on the front cover in the fully locked state. At the same time, a locking hook (32) is also formed on the ratchet (3) along the direction in which the locking ring (100) escapes from the locking groove (31) for limiting the locking ring (100) in the half-locked state. A gunpowder trigger assembly (4), the gunpowder trigger assembly (4) being arranged on the lock box (1), the gunpowder trigger assembly (4) comprising an assembly body (41) and an extension rod (42) which can extend out of the assembly body (41), the gunpowder trigger assembly (4) triggering the gunpowder and allowing the extension rod (42) to extend out of the assembly body (41) after receiving a signal of a vehicle body collision; An ejector rod (5), the ejector rod (5) is rotatably arranged on the lock box (1) and shares a rotating shaft with the ratchet (2). The ejector rod (5) has its own rotating force. In the fully locked state, the ejector rod (5) is pressed by the lock ring (100). After the lock ring (100) is released from restriction, the ejector rod (5) rotates under the action of the rotating force to eject the lock ring (100) out of the lock groove (31); A push rod (6) is rotatably arranged on the lock box (1). The push rod (6) is formed with a force section (61), a support section (62) and an unlocking restricted section (63) along the rotation direction. The push rod (6) has a rotation force. Under the action of the rotation force, the force section (61) of the push rod (6) abuts against the extension rod (42). After the gunpowder is triggered, the extension rod (42) pushes the force section (61) to rotate the push rod (6). When the push rod (6) rotates, the unlocking restricted section (63) pushes the pawl (2) to release the restriction on the ratchet (3), and the ratchet (3) after the restriction is released releases the restriction on the lock ring (100). Subsequently, the pawl (2) and the ratchet (3) enter an interlocking state again, and the front cover lock enters a semi-locking state from a fully locked state. In the semi-locking state, the pawl (2) reversely limits the unlocking restricted section (63) of the pushed rod (6) after rotation to prevent the pushed rod (6) from resetting.

2. The double-pull front cover lock with active pedestrian protection function according to claim 1, characterized in that: It also includes an ejector rod limiting assembly, the ejector rod limiting assembly including: A fixing rod (7), the fixing rod (7) being mounted on the lock box (1), one end of the fixing rod (7) being sleeved on the rotation axis of the ratchet (2), and the end being formed with a yielding arc portion (71) for the ejection rod (5) to rotate and a limiting edge portion (72) adjacent to the yielding arc portion (71) for limiting the ejection rod (5), the other end of the fixing rod (7) being sleeved on the rotation axis of the push rod (6), and a recessed portion (73) being formed in the middle section of the fixing rod (7); a first limiting flange (51), the first limiting flange (51) being formed by folding the main body of the ejector rod (5) and extending along the axial direction of the rotation axis of the ejector rod (5); a portion of the first limiting flange (51) abutting against the yielding arc portion (71) and the limiting edge portion (72) of the fixing rod (7); when the ejector rod (5) is ejected to the limit position, the first limiting flange (51) is limited by the limiting edge portion (72) so that the rod body of the ejector rod (5) stops on the reset path of the locking ring (100); The second limiting flange (52) is formed by folding the main body of the ejector rod (5) and extending along the axial direction of the rotating shaft of the ejector rod (5). Before the gunpowder is triggered, the second limiting flange (52) of the ejector rod (5) rests on the clearance space formed by the recessed portion (73) of the fixing rod (7). After the gunpowder is triggered, the second limiting flange (52) is reversely supported by the supporting section (62) of the rotating push rod (6), so that the ejector rod (5) always supports the locking ring (100) to prevent the locking ring (100) from resetting.

3. The double-pull front cover lock with active pedestrian protection function according to claim 2, characterized in that: The ratchet (2) is formed with a protrusion (21) on one side of the middle section of the fixing rod (7) away from the recessed portion (73), and the protrusion (21) extends out along the axial direction of the rotation axis of the ratchet (2). After the gunpowder is triggered, the unlocking restricted section (63) of the push rod (6) drives the ratchet (2) to rotate by pushing the protrusion (21).

4. The double-pull front cover lock with active pedestrian protection function according to claim 3, characterized in that: The invention also comprises a switch harness assembly (8) arranged on the lock box (1), wherein the switch harness assembly (8) is electrically connected to a body control module (BCM); at the same time, the plastic-coated part of the ratchet (3) is formed into a push rod (33), and the push rod (33) displays the state of the front cover lock on the body control module (BCM) by pressing a micro switch on the switch harness assembly (8).

5. The double-pull front cover lock with active pedestrian protection function according to claim 4, characterized in that: The lock box (1) comprises a cover plate (11) and a bottom plate (12) which are assembled together, and an assembly area is formed between the cover plate (11) and the bottom plate (12) to assemble the pawl (2), the ratchet (3), the gunpowder trigger assembly (4), the ejection rod (5), the push rod (6), the fixing rod (7) and the switch harness assembly (8).

6. The double-pull front cover lock with active pedestrian protection function according to claim 5, characterized in that: An open groove (121) is formed on the bottom plate (12) to receive the gunpowder trigger assembly (4).

7. The double-pull front cover lock with active pedestrian protection function according to claim 1, characterized in that: The two ends of the engaging opening of the ratchet (2) are respectively formed with a claw hook (22) and a pressure block (23); the ratchet (3) is sequentially formed with a first locking tooth (34), a second locking tooth (35), a stopper (36) and the locking hook (32) along the rotation direction; In the fully locked state, the claw hook (22) of the pawl (2) and the first latching tooth (34) of the ratchet wheel (3) abut against each other to form an interlocking state. By applying a first external force to the pawl (2), the pawl (2) overcomes its own rotational force and rotates in the opposite direction. The reverse rotation of the pawl (2) causes the first latching tooth (34) to escape from the claw hook (22). The pawl (2) continues to rotate until the pressing block (23) of the pawl (2) is pressed against the stopper (36) of the ratchet wheel (3) and is restricted from rotating. The external force applied to the pawl (2) is released, and the pawl (2) is reset under the action of the rotational force, so that the second latching tooth (35) of the ratchet wheel (3) rotating under the action of the rotational force abuts against each other with the pawl (2) to form an interlocking state. At this point, the front cover lock enters a semi-locked state from a fully locked state, and a second external force is applied to the pawl (2) so that the pawl (2) overcomes its own rotational force and rotates in the opposite direction. The pawl (2) rotates in the opposite direction so that the second latching tooth (35) escapes from the pawl hook (22), and the external force applied to the pawl (2) is released. The pawl (2) and the ratchet (3) rotate under the action of their respective rotational forces until the pressure block (23) of the pawl (2) and the lock hook arm (321) of the lock hook (32) of the ratchet (3) abut against each other to form an interlocking state, and the front cover lock enters a fully open state from a semi-locked state.

8. The double-pull front cover lock with active pedestrian protection function according to claim 7, characterized in that: The ratchet (2) is connected with a pulling cable.

9. The double-pull front cover lock with active pedestrian protection function according to claim 8, characterized in that: The first external force applied to the ratchet (2) is applied by the cable or the push rod (6); the second external force applied to the ratchet (2) is applied by the cable.

10. The double-pull front cover lock with active pedestrian protection function according to claim 1, characterized in that: The rotational forces of the pawl (2), the ratchet wheel (3), the ejection rod (5) and the push rod (6) are all provided by corresponding torsion springs or springs arranged on the lock box (1).

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