CN115709757A - Automobile front cover with rigidity and active pedestrian protection - Google Patents

Abstract

The invention discloses an automobile front cover with rigidity and active pedestrian protection, which comprises a front cover inner plate and a front cover outer plate arranged on the upper side of the front cover inner plate, wherein a cavity is formed between the front cover inner plate and the front cover outer plate, and a plurality of variable-rigidity supporting mechanisms are arranged in the cavity; each variable stiffness supporting mechanism comprises an elastic supporting piece, a rack and a locking assembly; the lower end of the elastic support piece is connected with the front cover inner plate, and the upper end and the lower end of the rack are respectively connected with the front cover outer plate and the elastic support piece; the locking assembly comprises a mounting bracket, a gear and ratchet wheel complex, a pawl and a driving assembly, and the mounting bracket is connected with the front cover inner plate. The invention can ensure the rigidity of the front cover outer plate and active pedestrian protection, can restore to the normal use state again after triggering the active pedestrian protection function, and can be used repeatedly, thereby reducing the after-sale cost, and meanwhile, the invention can be applied to various vehicle types and has high universality.

Description

Automobile front cover with rigidity and active pedestrian protection

Technical Field

The invention relates to an automobile body structure, in particular to an automobile front cover with rigidity and active pedestrian protection.

Background

The automobile front cover is also called as an automobile engine cover and is used for shielding an engine compartment, and when an accident that a pedestrian collides with an automobile occurs, the head of the pedestrian is easy to collide with the automobile front cover, so that the head of the pedestrian is damaged. In the prior art, an automobile front cover is generally designed to be of a structure with a crumple support piece, the crumple support piece can be crumpled and absorb energy after the head of a pedestrian collides, injury to the pedestrian is reduced, but the structure takes the rigidity of the automobile front cover as a cost, an outer plate of the front cover does not have high-strength support, the automobile front cover is easy to deform and make abnormal sound when the automobile runs at a high speed or a palm presses or switches the automobile front cover, customers complain about loss of brands, and when high-altitude parabolic or mountain falling rocks impact the automobile front cover, the safety of an engine compartment cannot be guaranteed. In addition, CNCAP is becoming more and more stringent for pedestrian protection, and CNCAP will require pedestrian protection to be satisfied in 2025 before passing legislation.

CN110077356A discloses a method, device, system, memory and terminal for active pedestrian protection, which is used to control the ignition device to detonate, the ignition device is used to bounce the engine cover; the method comprises the following steps: acquiring a front image acquired by a camera; acquiring the collision distance between an obstacle and a vehicle, which is acquired by a radar; judging whether the front image has a pedestrian or not and judging whether the collision distance is smaller than a first threshold value or not; if the pedestrian exists in the front image and the collision distance is smaller than the first threshold value, a pre-detonation instruction is sent to the ignition device so that the ignition device can be prepared for detonation. By adopting the invention, whether detonation is needed or not can be identified, and unnecessary waste is avoided; and faster detonation, thereby better protecting pedestrians. Needless to say, the technical solution disclosed in the above patent document is a beneficial attempt in the technical field, however, the initiation device of the present invention cannot be recycled, the front cover needs to be replaced again after one initiation, the maintenance cost is high, and if the threshold setting of the system is low, the system is easily triggered by mistake, which causes unavoidable maintenance cost, and if the threshold setting is high, the pedestrian protection cannot be performed, so the setting requirement of the system is high.

Disclosure of Invention

In view of the above, an object of the present invention is to provide an automobile front cover with both rigidity and active pedestrian protection, which can ensure rigidity of a front cover outer panel and active pedestrian protection, can be restored to a normal use state again after triggering an active pedestrian protection function, can be used repeatedly, can reduce after-sales cost, can be applied to various vehicle types, and has high versatility.

The automobile front cover with both rigidity and active pedestrian protection comprises a front cover inner plate and a front cover outer plate arranged on the upper side of the front cover inner plate, wherein a cavity is formed between the front cover inner plate and the front cover outer plate, and a plurality of variable-rigidity supporting mechanisms are arranged in the cavity; the variable stiffness support mechanisms comprise elastic support pieces, racks and locking assemblies; the lower end of the elastic supporting piece is connected with the front cover inner plate, and the upper end and the lower end of the rack are respectively connected with the front cover outer plate and the elastic supporting piece; the locking assembly comprises a mounting bracket, a gear and ratchet wheel complex, a pawl and a driving assembly, the mounting bracket is connected with the inner plate of the front cover, the gear and ratchet wheel complex is rotatably arranged on the mounting bracket, the gear and ratchet wheel complex comprises a gear part matched with the rack and a ratchet part matched with the pawl, and the ratchet part and the gear part are connected in a synchronous rotating manner; the driving component can drive the pawl to be close to or far away from the ratchet part; when the pawl is engaged with the ratchet portion, the rack is movable upward and immovable downward; when the pawl is separated from the ratchet portion, the rack is movable in the up-down direction.

Further, still include collision sensor and controller, collision sensor, controller and drive assembly signal connection in proper order.

Further, the driving assembly comprises a power supply, a switch, an electromagnet, a lever, an armature, a supporting rod and a reset element; the pawl is arranged at one end, close to the ratchet wheel part, of the lever, the armature is arranged at one end, far away from the ratchet wheel part, of the lever, the middle part of the lever is connected with the supporting rod in a rotatable mode, and the electromagnet is arranged on the lower side of the armature; when the switch is closed, the power supply supplies power to the electromagnet, the electromagnet adsorbs the armature, and the lever drives the pawl to be far away from the ratchet part so as to separate the pawl from the ratchet part; when the switch is switched off, the electromagnet is powered off, and the reset element enables the lever to drive the pawl to be close to the ratchet wheel part, so that the pawl is meshed with the ratchet wheel part.

Further, the reset element is an extension spring, the extension spring is arranged between the pawl and the support rod, the upper end of the extension spring is connected with the lever, the lower end of the extension spring is fixed in position, the extension spring has a contracting movement trend, and therefore the lever has a movement trend for driving the pawl to move close to the pawl portion.

Further, the locking subassembly still includes the installing frame, the bracing piece the lower extreme of extension spring and the electro-magnet all with installing frame fixed connection.

Further, it is a plurality of variable rigidity supporting mechanism all still includes direction installed part, be provided with spout and installation cavity on the direction installed part, the rack includes sliding part, supporting part and profile of tooth portion, sliding part with spout sliding fit, the upper end of supporting part with the front shroud planking is connected, the lower extreme of supporting part with elastic support element's upper end is connected, elastic support element is located the installation cavity, profile of tooth portion expose in the direction installed part.

Further, the ratchet part and the gear part are connected into a whole, and the rotation central axes of the ratchet part and the gear part are collinear.

Further, a plurality of the variable stiffness support mechanisms are arranged in the cavity at intervals in an array distribution mode.

Further, the front cover hinge is connected with the front cover inner plate.

Furthermore, the upper end face of the rack is connected with the front cover outer plate through structural adhesive.

The invention has the beneficial effects that:

1. under normal conditions, the variable-rigidity supporting mechanism can provide high-strength support for the front cover outer plate, the rigidity of the front cover outer plate is guaranteed, the front cover outer plate is prevented from deforming and abnormal sound when an automobile runs at high speed or a palm presses or the automobile front cover is opened and closed, and the safety of an engine compartment can be guaranteed when high-altitude parabolic or mountain falling stones impact the automobile front cover; when the collision sensor detects that the collision sensor is about to collide with a pedestrian, the energy absorption can be buffered, and an active pedestrian protection function is provided;

2. the invention ensures the rigidity of the outer plate of the front cover and the active pedestrian protection, can be recovered to a normal use state again after triggering the active pedestrian protection function, can be used repeatedly, is not disposable, and can reduce the after-sale cost;

3. the variable-rigidity supporting mechanism can be produced independently in a modularized mode, is applied to various vehicle types, is high in universality, can be flexibly arranged according to the modeling of the vehicle, does not have excessive limitation on the structures of the front cover inner plate and the front cover outer plate, reduces the design difficulty of the vehicle types, shortens the development period and reduces the research and development cost.

Drawings

In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:

FIG. 1 is a schematic structural diagram of the present invention (in this case, a normal driving state of an automobile);

FIG. 2 is a schematic diagram of the present invention (now providing active pedestrian protection);

FIG. 3 is a schematic structural view of the present invention;

FIG. 4 is a schematic structural view of FIG. 3 with the outer plate of the front cover hidden;

FIG. 5 is an enlarged partial schematic view of FIG. 4;

FIG. 6 is a schematic structural view of a variable stiffness support mechanism of the present invention;

FIG. 7 is a schematic cross-sectional view of a variable stiffness support mechanism of the present invention;

FIG. 8 is a schematic structural view of the rack of the present invention;

FIG. 9 is a schematic view of a gear ratchet complex of the present invention;

FIG. 10 is a schematic view of the guide mount of the present invention;

FIG. 11 is a schematic view of the elastic support member of the present invention;

FIG. 12 is a schematic diagram of the electromagnet of the present invention;

FIG. 13 is a schematic view of the pawl of the present invention in connection with a portion of the structure of the drive assembly.

The drawings are numbered as follows:

1-a front cover inner plate;

2-variable rigidity support mechanism, 21-elastic support, 22-rack, 221-sliding part, 222-supporting part, 223-tooth-shaped part, 23-mounting bracket, 24-gear ratchet complex, 241-gear part, 242-ratchet part, 25-pawl, 261-power supply, 262-switch, 263-electromagnet, 264-lever, 265-armature, 266-support rod, 267-reset element, 268-mounting frame, 27-guide mounting part, 271-sliding groove, 272-mounting cavity and 28-structural adhesive;

3-front cover outer plate; 4-a collision sensor; 5-a controller; 6-front cover hinge.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in fig. 1 to 13, the automotive front cover with both rigidity and active pedestrian protection in the present embodiment includes a front cover inner panel 1 and a front cover outer panel 3 disposed on an upper side of the front cover inner panel 1, a cavity is provided between the front cover inner panel 1 and the front cover outer panel 3, and a plurality of variable rigidity support mechanisms 2 are disposed in the cavity; the variable stiffness support mechanisms 2 each comprise an elastic support 21, a rack 22 and a locking assembly; the lower end of the elastic support piece 21 is connected with the front cover inner plate 1, and the upper end and the lower end of the rack 22 are respectively connected with the front cover outer plate 3 and the elastic support piece 21; the locking assembly comprises a mounting bracket 23, a gear and ratchet wheel complex 24, a pawl 25 and a driving assembly, wherein the mounting bracket 23 is connected with the front cover inner plate 1, the gear and ratchet wheel complex 24 is rotatably arranged on the mounting bracket 23, the gear and ratchet wheel complex 24 comprises a gear part 241 matched with the rack 22 and a ratchet wheel part 242 matched with the pawl 25, and the ratchet wheel part 242 and the gear part 241 are connected in a synchronous rotation manner; the driving component can drive the pawl 25 to approach or move away from the ratchet part 242; when the pawl 25 is engaged with the ratchet portion 242, the rack 22 can move upward and cannot move downward; when the ratchet 25 is separated from the ratchet portion 242, the rack 22 can move in the up-down direction.

In this embodiment, the vehicle further comprises an impact sensor 4 and a controller 5, wherein the impact sensor 4, the controller 5 and the driving component are sequentially in signal connection.

In this embodiment, the driving assembly includes a power source 261, a switch 262, an electromagnet 263, a lever 264, an armature 265, a support rod 266, and a reset element 267; the pawl 25 is arranged at one end of the lever 264 close to the pawl part 242, the armature 265 is arranged at one end of the lever 264 far from the pawl part 242, the middle part of the lever 264 is rotatably connected with the supporting rod 266, and the electromagnet 263 is arranged at the lower side of the armature 265; when the switch 262 is closed, the power source 261 supplies power to the electromagnet 263, the electromagnet 263 absorbs the armature 265, so that the lever 264 drives the pawl 25 away from the ratchet portion 242, and the pawl 25 is separated from the ratchet portion 242; when the switch 262 is turned off and the electromagnet 263 is de-energized, the reset element 267 causes the lever 264 to move the pawl 25 adjacent to the ratchet portion 242 so that the pawl 25 engages the ratchet portion 242.

In this embodiment, the reset element 267 is a tension spring, the tension spring is disposed between the pawl 25 and the support rod 266, the upper end of the tension spring is connected to the lever 264, the lower end of the tension spring is fixed, and the tension spring has a motion tendency of contracting, so that the lever 264 has a motion tendency of driving the pawl 25 to move close to the ratchet portion 242.

The elastic support 21 may be a spring, the electromagnet 263 may be a structure in which an iron core is wound around an electromagnetic coil, and the pawl 25 may be formed as a single body with the lever 264.

Under normal conditions, the reset element 267 enables the pawl 25 to be meshed with the ratchet wheel part 242, the ratchet wheel part 242 can only rotate clockwise but cannot rotate anticlockwise, the ratchet wheel part 242 and the gear part 241 rotate synchronously, so the gear part 241 can only rotate clockwise but cannot rotate anticlockwise, meanwhile, due to the fact that the rack 22 is meshed with the gear part 241, the gear part 241 is driven to rotate anticlockwise by downward movement of the rack 22, the gear part 241 is driven to rotate clockwise by upward movement of the gear, the gear part 241 cannot rotate anticlockwise to enable the rack 22 to not move downwards, at the moment, the variable-rigidity supporting mechanism 2 can provide high-strength support for the front cover outer plate 3, rigidity of the front cover outer plate 3 is guaranteed, deformation and abnormal sound of the front cover outer plate 3 are prevented when a front cover of an automobile is pressed by a palm or a switch 262, and safety of a cabin engine can be guaranteed when high altitude or mountain falling stones impact on the front cover of the automobile.

When the collision sensor 4 detects that a collision with a pedestrian is about to occur, the controller 5 closes the switch 262, the power supply 261 supplies power to the electromagnet 263, the electromagnet 263 adsorbs the armature 265, the lever 264 drives the pawl 25 to be far away from the ratchet part 242, so that the pawl 25 is separated from the ratchet part 242, the ratchet part 242 and the gear part 241 can rotate freely at the moment, the rack 22 can move freely up and down, when the pedestrian collides with the front cover outer plate 3, the front cover outer plate 3 drives the rack 22 to move downwards, so that the elastic support 21 is compressed, and the buffering and energy absorption functions are realized, and the active pedestrian protection function is provided; when the pedestrian is left from the front cover outer panel 3 after the pedestrian protection structure, the elastic support 21 is restored to its shape, the rack 22 is moved upward to return to the initial position, the power source 261 stops supplying power, and the pawl 25 is kept engaged with the ratchet portion 242.

In conclusion, the automobile front cover in the embodiment gives consideration to ensuring the rigidity of the front cover outer plate 3 and active pedestrian protection, can be restored to a normal use state again after triggering the active pedestrian protection function, can be used repeatedly, is not disposable, can reduce the after-sale cost, can be produced in a single modularization mode by the variable rigidity supporting mechanism 2, is applied to various automobile types, is high in universality, can be used for flexibly arranging the position of the variable rigidity supporting mechanism 2 according to the automobile model, does not have too many restrictions on the structures of the front cover inner plate 1 and the front cover outer plate 3, reduces the design difficulty of the automobile type and shortens the development cycle, and reduces the research and development cost.

The mounting bracket 23, the gear ratchet complex 24, the pawl 25, the lever 264, the support rod 266 and other structures can all adopt plastic materials, so that the weight is reduced, and the automobile is light.

In this embodiment, the locking assembly further includes a mounting frame 268, and the support rod 266, the lower end of the tension spring and the electromagnet 263 are all fixedly connected to the mounting frame 268. The installing frame 268 is used for providing an installing position for the supporting rod 266, the tension spring and the electromagnet 263, modularization and integration are further improved, and installation is performed after the modularization is facilitated.

In this embodiment, each of the variable stiffness support mechanisms 2 further includes a guide mounting member 27, the guide mounting member 27 is provided with a sliding groove 271 and a mounting cavity 272, the rack 22 includes a sliding portion 221, a support portion 222 and a tooth portion 223, the sliding portion 221 is in sliding fit with the sliding groove 271, the upper end of the support portion 222 is connected with the front cover outer panel 3, the lower end of the support portion 222 is connected with the upper end of the elastic support member 21, the elastic support member 21 is located in the mounting cavity 272, and the tooth portion 223 is exposed out of the guide mounting member 27. The sliding groove 271 of the guide mounting member 27 is engaged with the sliding portion 221 of the rack 22, so that the rack 22 can be ensured to move in the vertical direction according to a track required by design, and the rack 22 can be prevented from being disengaged; the mounting cavity 272 of the guide mounting member 27 can provide a mounting position for the elastic support member 21, preventing the elastic support member 21 from coming out.

In this embodiment, the ratchet portion 242 and the gear portion 241 are connected as a whole, and the rotation central axes of the ratchet portion 242 and the gear portion 241 are collinear.

In this embodiment, a plurality of the variable stiffness support mechanisms 2 are arranged in the cavity at intervals in an array distribution.

In the embodiment, the automobile front cover further comprises a front cover hinge 6 connected with the front cover inner plate 1, and the front cover inner plate 1 is connected with the automobile body through the front cover hinge 6.

In this embodiment, the upper end surface of the rack 22 is connected to the front cover outer panel 3 through the structural adhesive 28, the structural adhesive 28 can ensure the connection strength, and the connection division can reduce the requirement of matching the upper end surface of the rack 22 with the profile of the front cover outer panel 3, thereby reducing the molding limitation on the front cover outer panel 3 and further improving the versatility of the variable stiffness support mechanism 2.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides a compromise rigidity and initiative pedestrian protection's car front shroud, includes front shroud inner panel (1) and sets up front shroud planking (3) of the upside of front shroud inner panel (1), its characterized in that: a cavity is arranged between the front cover inner plate (1) and the front cover outer plate (3), and a plurality of variable rigidity supporting mechanisms (2) are arranged in the cavity;

the variable stiffness supporting mechanisms (2) comprise elastic supporting pieces (21), racks (22) and locking assemblies;

the lower end of the elastic support piece (21) is connected with the front cover inner plate (1), and the upper end and the lower end of the rack (22) are respectively connected with the front cover outer plate (3) and the elastic support piece (21);

the locking assembly comprises a mounting bracket (23), a gear and ratchet wheel complex (24), a pawl (25) and a driving assembly, the mounting bracket (23) is connected with the front cover inner plate (1), the gear and ratchet wheel complex (24) is rotatably arranged on the mounting bracket (23), the gear and ratchet wheel complex (24) comprises a gear portion (241) matched with the rack (22) and a ratchet portion (242) matched with the pawl (25), and the ratchet portion (242) is connected with the gear portion (241) in a synchronous rotating mode; the driving component can drive the pawl (25) to approach or move away from the pawl part (242); the rack (22) being movable upwardly and immovable downwardly when the pawl (25) is engaged with the pawl portion (242); when the pawl (25) is separated from the pawl portion (242), the rack (22) can move in the up-down direction.

2. The automotive front cover according to claim 1, wherein the front cover has rigidity and active pedestrian protection, and the front cover comprises: the automobile collision sensor device is characterized by further comprising a collision sensor (4) and a controller (5), wherein the collision sensor (4), the controller (5) and the driving assembly are sequentially in signal connection.

3. The automotive front cover according to claim 1, characterized in that: the driving component comprises a power supply (261), a switch (262), an electromagnet (263), a lever (264), an armature (265), a supporting rod (266) and a reset element (267); the pawl (25) is arranged at one end, close to the ratchet part (242), of the lever (264), the armature (265) is arranged at one end, far away from the ratchet part (242), of the lever (264), the middle of the lever (264) is connected with the supporting rod (266) in a rotatable mode, and the electromagnet (263) is arranged on the lower side of the armature (265); when the switch (262) is closed, the power supply (261) supplies power to the electromagnet (263), the electromagnet (263) adsorbs the armature (265), and the lever (264) drives the pawl (25) to be far away from the pawl part (242) so that the pawl (25) is separated from the pawl part (242); when the switch (262) is turned off, the electromagnet (263) is de-energized, and the reset element (267) enables the lever (264) to drive the pawl (25) to be close to the ratchet portion (242) so that the pawl (25) is meshed with the ratchet portion (242).

4. The automotive front cover according to claim 1, wherein the front cover has rigidity and active pedestrian protection, and the front cover comprises: reset element (267) is the extension spring, the extension spring sets up between pawl (25) and bracing piece (266), the upper end of extension spring with lever (264) are connected, the lower extreme rigidity of extension spring, the extension spring has the motion trend of shrink, so that lever (264) has the drive pawl (25) are close to the motion trend that ratchet portion (242) removed.

5. The automotive front cover according to claim 4, wherein the front cover has rigidity and active pedestrian protection, and the front cover comprises: the locking subassembly still includes installing frame (268), bracing piece (266), the lower extreme of extension spring and electro-magnet (263) all with installing frame (268) fixed connection.

6. The automotive front cover according to claim 1, characterized in that: the variable-rigidity supporting mechanisms (2) further comprise guide mounting pieces (27), sliding grooves (271) and mounting cavities (272) are formed in the guide mounting pieces (27), the racks (22) comprise sliding portions (221), supporting portions (222) and tooth-shaped portions (223), the sliding portions (221) are in sliding fit with the sliding grooves (271), the upper ends of the supporting portions (222) are connected with the front cover outer plate (3), the lower ends of the supporting portions (222) are connected with the upper ends of the elastic supporting pieces (21), the elastic supporting pieces (21) are located in the mounting cavities (272), and the tooth-shaped portions (223) are exposed out of the guide mounting pieces (27).

7. The automotive front cover according to claim 1, wherein the front cover has rigidity and active pedestrian protection, and the front cover comprises: the ratchet part (242) is connected with the gear part (241) into a whole, and the rotation central axes of the ratchet part (242) and the gear part (241) are collinear.

8. The automotive front cover according to claim 1, characterized in that: a plurality of variable stiffness support mechanisms (2) are arranged in the cavity at intervals in an array distribution mode.

9. The automotive front cover according to claim 1, wherein the front cover has rigidity and active pedestrian protection, and the front cover comprises: the front cover structure also comprises a front cover hinge (6) connected with the front cover inner plate (1).

10. The automotive front cover according to claim 1, wherein the front cover has rigidity and active pedestrian protection, and the front cover comprises: the upper end face of the rack (22) is connected with the front cover outer plate (3) through structural adhesive (28).

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