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

A car front cover with both rigidity and active pedestrian protection

technical field

The invention relates to an automobile body structure, in particular to an automobile front cover which takes into account both rigidity and active pedestrian protection.

Background technique

The front cover of the car is also called the hood of the car, which is used to cover the engine compartment. When a car collides with a pedestrian, it is easy for the head of the pedestrian to hit the front cover of the car and cause the head injury of the pedestrian. In the prior art, the front cover of the car is usually designed to have a structure of a collapse support, which can collapse and absorb energy after the impact of the pedestrian's head, reducing the injury to the pedestrian, but this structure is to reduce The rigidity of the front cover of the car is at the expense of the outer panel of the front cover without high-strength support. When the car is driving at high speed or the palm is pressed or the front cover of the car is opened or closed, it is easy to deform and make abnormal noises. Customers complain that it will cause damage to the brand. When it happens When a high-altitude parabolic or a falling rock hits the front hood of the car, the safety of the engine compartment cannot be guaranteed. In addition, CNCAP has increasingly stringent requirements for pedestrian protection. In 2025, CNCAP will require pedestrian protection to meet the requirements before passing regulations.

CN110077356A discloses a method, device, system, memory and terminal for actively protecting pedestrians. A method for actively protecting pedestrians is disclosed. The method is used to control the detonation of an ignition device, and the ignition device is used to pop up the engine cover; The method includes: obtaining the front image collected by the camera; obtaining the collision distance between the obstacle and the vehicle collected by the radar; judging whether there is a pedestrian in the front image, and judging whether the collision distance is less than a first threshold; if the If there is a pedestrian in the front image, and the collision distance is smaller than the first threshold, a pre-detonation instruction is sent to the ignition device, so that the ignition device prepares for detonation. By adopting the invention, it has the advantages of identifying whether detonation is required, avoiding unnecessary waste, and detonating faster, thereby better protecting pedestrians. Undoubtedly, the technical solution disclosed in the above-mentioned patent document is a beneficial attempt in the technical field, but the detonating device of the invention cannot be recycled, and the front cover needs to be replaced once detonated, and the maintenance cost is high, and if the threshold value of the system is set If the threshold value is low, it is easy to be triggered by mistake, resulting in unavoidable maintenance costs. If the threshold value is set high, it will not be able to protect pedestrians, so the requirements for system settings are relatively high.

Contents of the invention

In view of this, the purpose of the present invention is to provide a car front cover that takes into account both rigidity and active pedestrian protection, which can ensure the rigidity of the outer panel of the front cover and active pedestrian protection, and can be restored to the normal use state again after the active pedestrian protection function is triggered. It can be used repeatedly, so that the after-sales cost can be reduced, and it can also be applied to a variety of vehicle models, with high versatility.

An automobile front cover in the present invention that takes into account both rigidity and active pedestrian protection, comprising a front cover inner panel and a front cover outer panel arranged on the upper side of the front cover inner panel, the front cover inner panel and the front cover inner panel There is a cavity between the outer panels of the cover, and a plurality of variable stiffness support mechanisms are arranged in the cavity; each of the plurality of variable stiffness support mechanisms includes an elastic support, a rack and a locking assembly; the elastic support The lower end of the component is connected to the inner panel of the front cover, and the upper and lower ends of the rack are respectively connected to the outer panel of the front cover and the elastic support; the locking assembly includes a mounting bracket, a gear ratchet complex, a pawl As well as a driving assembly, the mounting bracket is connected to the inner panel of the front cover, the gear and ratchet complex is rotatably arranged on the mounting bracket, and the gear and ratchet complex includes a gear for connecting with the rack A cooperating gear part and a ratchet part for cooperating with the ratchet part, the ratchet part and the gear part are connected in a manner capable of synchronous rotation; the drive assembly can drive the ratchet to approach or move away from the ratchet part; When the pawl is engaged with the ratchet part, the rack can move upward and cannot move downward; when the pawl is separated from the ratchet part, the rack can move in an up and down direction.

Further, a collision sensor and a controller are also included, and the collision sensor, the controller and the driving assembly are sequentially connected with signals.

Further, the drive assembly includes a power supply, a switch, an electromagnet, a lever, an armature, a support rod and a reset element; the pawl is arranged at one end of the lever close to the ratchet part, and the armature is arranged at the end of the lever One end away from the ratchet part, the middle part of the lever is connected to the support rod in a rotatable manner, and the electromagnet is arranged on the lower side of the armature; when the switch is closed, the power supply is supplied to the electromagnetic Iron power supply, the electromagnet absorbs the armature, so that the lever drives the pawl away from the ratchet part, so that the pawl is separated from the ratchet part; when the switch is turned off, the electromagnetic When the iron is de-energized, the reset element causes the lever to drive the pawl close to the ratchet part, so that the pawl engages with the ratchet part.

Further, the reset element is a tension spring, the tension spring is arranged between the pawl and the support rod, the upper end of the tension spring is connected to the lever, the lower end of the tension spring is fixed, and the tension spring The spring has a movement tendency of shrinking, so that the lever has a movement tendency of driving the pawl to move close to the ratchet part.

Further, the locking assembly further includes a mounting frame, and the support rod, the lower end of the extension spring, and the electromagnet are all fixedly connected to the mounting frame.

Further, each of the plurality of variable stiffness support mechanisms also includes a guide mounting part, and the guide mounting part is provided with a sliding groove and a mounting cavity, and the rack includes a sliding part, a supporting part and a toothed part, and the sliding The upper end of the supporting part is connected with the outer panel of the front cover, and the lower end of the supporting part is connected with the upper end of the elastic supporting part, and the elastic supporting part is located in the installation cavity , the tooth-shaped portion is exposed to the guide installation part.

Further, the ratchet part and the gear part are connected as a whole, and the ratchet part is collinear with the rotation central axis of the gear part.

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

Further, it also includes a front cover hinge connected with the front cover inner panel.

Further, the upper end surface of the rack is connected to the outer panel of the front cover through structural glue.

The beneficial effects of the present invention are:

1. In the present invention, under normal circumstances, the variable rigidity support mechanism can provide higher strength support for the outer panel of the front cover to ensure the rigidity of the outer panel of the front cover, and prevent the The outer panel of the front cover is deformed and makes abnormal noise. When a high-altitude parabolic or falling rock hits the front cover of the car, the safety of the engine compartment can be guaranteed; when the collision sensor detects that a collision with a pedestrian is about to occur, the invention can buffer energy and provide Active pedestrian protection function;

2. The present invention ensures both the rigidity of the front cover outer panel and the active pedestrian protection. After the active pedestrian protection function is triggered, it can be restored to the normal use state again and can be used repeatedly. It is not disposable and can reduce after-sales costs;

3. The variable stiffness support mechanism of the present invention can be independently modularized, applied to various vehicle types, has high versatility, and can flexibly arrange the position of the variable stiffness support mechanism according to the shape of the car. For the front cover inner panel and the front cover outer There are not too many restrictions on the structure of the board, which reduces the difficulty of model design, shortens the development cycle, and reduces research and development costs.

Description of drawings

In order to make the purpose, technical scheme and beneficial effect of the present invention clearer, the present invention provides the following drawings for illustration:

Fig. 1 is the structural representation of the present invention (this moment is automobile normal driving state);

Fig. 2 is a schematic structural diagram of the present invention (providing active pedestrian protection function at this time);

Fig. 3 is a structural representation of the present invention;

Fig. 4 is a schematic diagram of the structure of Fig. 3 after hiding the outer panel of the front cover;

Fig. 5 is a partially enlarged schematic diagram of Fig. 4;

Fig. 6 is a structural schematic diagram of the variable stiffness support mechanism of the present invention;

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

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

Fig. 9 is a schematic structural view of the gear and ratchet complex of the present invention;

Fig. 10 is a schematic structural view of the guide mounting part of the present invention;

Figure 11 is a schematic structural view of the elastic support of the present invention;

Fig. 12 is the structural representation of electromagnet of the present invention;

Fig. 13 is a structural schematic diagram of the partial structural connection between the pawl and the drive assembly of the present invention.

The markings in the attached drawings are as follows:

1- Front cover inner panel;

2-variable stiffness support mechanism, 21-elastic support, 22-rack, 221-sliding part, 222-support part, 223-toothed part, 23-installation bracket, 24-gear ratchet complex, 241-gear Department, 242-ratchet, 25-pawl, 261-power supply, 262-switch, 263-electromagnet, 264-lever, 265-armature, 266-support rod, 267-resetting element, 268-installation frame, 27- Guide mounting piece, 271-sliding slot, 272-installation cavity, 28-structural glue;

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

Detailed ways

The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 13, a car front hood in this embodiment that takes into account both rigidity and active pedestrian protection includes a front hood inner panel 1 and a front hood outer panel arranged on the upper side of the front hood inner panel 1 Plate 3, there is a cavity between the front cover inner panel 1 and the front cover outer panel 3, and a plurality of variable stiffness support mechanisms 2 are arranged in the cavity; a plurality of the variable stiffness support mechanisms 2 Each includes an elastic support 21, a rack 22 and a locking assembly; the lower end of the elastic support 21 is connected to the inner panel 1 of the front cover, and the upper and lower ends of the rack 22 are connected to the outer panel of the front cover respectively. 3 and the elastic support member 21; the locking assembly includes a mounting bracket 23, a gear and ratchet complex 24, a pawl 25 and a drive assembly, the mounting bracket 23 is connected with the front cover inner panel 1, and the gear and ratchet The complex 24 is rotatably arranged on the mounting bracket 23 , and the gear and ratchet complex 24 includes a gear part 241 for cooperating with the rack 22 and a ratchet for cooperating with the pawl 25 part 242, the ratchet part 242 is connected with the gear part 241 in a manner capable of synchronous rotation; the driving assembly can drive the pawl 25 to approach or move away from the ratchet part 242; when the pawl 25 and the ratchet When the ratchet part 242 is engaged, the rack 22 can move upward and cannot move downward; when the pawl 25 is separated from the ratchet part 242 , the rack 22 can move up and down.

In this embodiment, a collision sensor 4 and a controller 5 are also included, and the collision sensor 4, the controller 5 and the driving assembly are sequentially connected with signals.

In this embodiment, the drive assembly includes a power supply 261, a switch 262, an electromagnet 263, a lever 264, an armature 265, a support rod 266, and a reset element 267; part 242, the armature 265 is arranged at the end of the lever 264 away from the ratchet part 242, the middle part of the lever 264 is connected with the support rod 266 in a rotatable manner, and the electromagnet 263 is arranged at the end of the ratchet part 242. The lower side of the armature 265; when the switch 262 is closed, the power supply 261 supplies power to the electromagnet 263, and the electromagnet 263 attracts the armature 265, so that the lever 264 drives the pawl 25 away from the armature. said ratchet part 242, so that said ratchet 25 is separated from said ratchet part 242; The pawl 25 is close to the ratchet part 242 so that the pawl 25 is engaged with the ratchet part 242 .

In this embodiment, the reset element 267 is a tension spring, the tension spring is arranged between the pawl 25 and the support rod 266, the upper end of the tension spring is connected with the lever 264, and the tension spring The position of the lower end is fixed, and the extension spring has a movement tendency to shrink, so that the lever 264 has a movement tendency to drive the ratchet 25 to move close to the ratchet part 242 .

The elastic supporting member 21 can be a spring, the electromagnet 263 can be a structure in which an electromagnetic coil is wound around an iron core, and the ratchet 25 can be a lever 264 as a whole.

Under normal circumstances, the reset element 267 makes the pawl 25 mesh with the ratchet part 242, and the ratchet part 242 can only rotate clockwise and cannot rotate counterclockwise. Since the ratchet part 242 and the gear part 241 rotate synchronously, the gear part 241 also It can only rotate clockwise and cannot rotate counterclockwise. At the same time, due to the meshing of the rack 22 and the gear part 241, the downward movement of the rack 22 will drive the gear part 241 to rotate counterclockwise, and the upward movement of the gear will drive the gear part 241 to rotate clockwise. Inability to rotate counterclockwise will make the rack 22 unable to move downwards. At this time, the variable stiffness support mechanism 2 can provide higher-strength support for the front cover outer panel 3 to ensure the rigidity of the front cover outer panel 3. When the palm is pressed or the switch 262 is used to switch the front cover of the car, the deformation and abnormal noise of the front cover outer panel 3 can be prevented.

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, and the electromagnet 263 absorbs the armature 265, so that the lever 264 drives the ratchet 25 away from the ratchet part 242, so that the ratchet 25 is separated from the ratchet part 242. At this moment, the ratchet part 242 and the gear part 241 can rotate freely, and the rack 22 can also move up and down freely. When a pedestrian hits the front cover outer panel 3, the front cover outer panel 3 Drive the rack 22 to move downwards to compress the elastic support 21, so as to realize buffering and energy absorption, and provide the active pedestrian protection function; when the pedestrian protection structure is completed and the pedestrian leaves the front cover outer panel 3, the elastic support 21 recovers its shape, The rack 22 moves upwards and returns to the initial position. At this time, the power supply 261 stops supplying power, and the ratchet 25 remains engaged with the ratchet part 242 .

To sum up, the automobile front cover in this embodiment takes into account both the rigidity of the front cover outer panel 3 and the active pedestrian protection. After the active pedestrian protection function is triggered, it can be restored to the normal use state again and can be used repeatedly. It is not disposable. It can reduce the after-sales cost, and at the same time, the variable stiffness support mechanism 2 can be independently modularized and applied to various car models, with high versatility, and the position of the variable stiffness support mechanism 2 can be flexibly arranged according to the shape of the car. For the front cover inner panel 1 And the structure of the front cover outer panel 3 does not have too many restrictions, which reduces the difficulty of vehicle design, shortens the development cycle, and reduces the research and development cost.

Structures such as the mounting bracket 23, the gear and ratchet complex 24, the pawl 25, the lever 264, and the support rod 266 can all be made of plastic, which reduces the weight and is beneficial to the lightweight of the vehicle.

In this embodiment, the locking assembly further includes a mounting frame 268 , and the supporting rod 266 , the lower end of the tension spring and the electromagnet 263 are all fixedly connected to the mounting frame 268 . The installation frame 268 provides installation positions for the support rod 266, the extension spring and the electromagnet 263, which further improves modularization and integration, and facilitates installation after modular production.

In this embodiment, each of the plurality of variable stiffness support mechanisms 2 also includes a guide mounting part 27, and the guide mounting part 27 is provided with a sliding groove 271 and a mounting cavity 272, and the rack 22 includes a sliding part 221, The supporting part 222 and the toothed part 223, the sliding part 221 is slidingly matched with the sliding groove 271, the upper end of the supporting part 222 is connected with the front cover outer panel 3, and the lower end of the supporting part 222 is connected with the The upper end of the elastic support member 21 is connected, the elastic support member 21 is located in the installation cavity 272 , and the tooth-shaped portion 223 is exposed to the guide installation member 27 . The chute 271 of the guide mounting part 27 cooperates with the sliding part 221 of the rack 22, which can ensure that the rack 22 moves in the up and down direction according to the trajectory required by the design, and can prevent the rack 22 from coming out; the mounting cavity 272 of the guide mounting part 27 can An installation position is provided for the elastic support 21 to prevent the elastic support 21 from falling out.

In this embodiment, the ratchet part 242 is connected with the gear part 241 as a whole, and the ratchet part 242 is in line with the central axis of rotation of the gear part 241 .

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

In this embodiment, a front cover hinge 6 connected with the front cover inner panel 1 is also included, and the front cover inner panel 1 is connected with the vehicle 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 a structural adhesive 28. The structural adhesive 28 can ensure the connection strength, and this connection method can reduce the contact between the upper end surface of the rack 22 and the outer panel 3. The shape and surface matching requirements of the front cover outer panel 3 can reduce the shape restriction on the front cover outer panel 3 and further improve the versatility of the variable stiffness support mechanism 2 .

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

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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