Vehicle front cover front and rear end double-point explosion pedestrian protection device and setting method

Abstract

The invention belongs to the field of automobile pedestrian protection hinges, and discloses an automobile front cover front end and rear end double-explosion pedestrian protection device which comprises a front end protection unit, a rear end protection unit and two telescopic exploders, and the front end protection unit comprises a front end driving hinge chain and a front end connector which are hinged to each other. The front-end driving hinge chain comprises a lock ring mounting plate and a front-end connecting pull rod which are hinged end to end, the rear-end protection unit comprises a rear-end driving hinge chain and a rear-end connector, the rear-end driving hinge chain comprises a vehicle body connecting rod and a rear-end connecting plate which are hinged end to end, and the vehicle body connecting rod is hinged to a fixed sheet metal part on a vehicle body. The two telescopic exploders are correspondingly located below the front-end connector and the rear-end connector respectively, a movable sliding groove is formed in the rear-end connector, and the rear-end driving hinge chain is matched with the rear-end connector through movable matching with the movable sliding groove. The invention further discloses an arrangement method of the double-point-explosion pedestrian protection device at the front end and the rear end of the vehicle front cover.

Description

Technical Field

[0001] The invention belongs to the field of automobile pedestrian protection hinges, and in particular relates to a double-point detonation pedestrian protection device at the front and rear ends of a vehicle hood and a setting method. Background Art

[0002] The automobile hood pedestrian protection system on the market is to set a hinge chain between the hood and the fixed sheet metal inside the vehicle body near the front window of the vehicle, and to lift up the component hinge in the hinge chain through a telescopic detonator, so that when the automobile triggers the pedestrian protection, the telescopic detonator is activated to expand the hinge chain and lift up the hood. Specifically, when the automobile triggers the pedestrian protection, the telescopic detonator is activated by a trigger signal sent by a collision sensor that detects the impact force of the automobile collision, and the telescopic detonator is as follows Figure 1 The telescopic two-section sleeve shown in the figure, when the telescopic detonator is started, the movable section sleeve instantly extends relative to the fixed section sleeve in the direction of the arrow in the figure, generating a strong impact on the hinge chain.

[0003] At present, there is no hinge chain at the front position of the vehicle, that is, when the pedestrian protection function is triggered, only the hood on the front window side pops up and provides a buffer space, while the hood on the front side does not pop up.

[0004] However, based on C-NCAP (China New Car Assessment Program), when a collision occurs between a pedestrian and a car, the front area of ​​the hood cannot be lifted up to provide a buffer space, that is, the HIC value does not reach the minimum safety index (<1000). At this time, if the pedestrian's head hits the front of the car or the body near the front of the car, the existing pedestrian protection device will cause the pedestrian's head to receive a serious impact, which will inevitably lead to personal injury. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a double-point detonation pedestrian protection device at the front and rear ends of a vehicle hood and a setting method. By setting two hinge chains respectively located at the front of the vehicle and near the front window of the vehicle and being able to coordinate to open the front of the vehicle, the impact on the pedestrian's head when hitting the front of the vehicle or the body of the vehicle near the front of the vehicle is greatly reduced, thereby avoiding most personal injuries.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A double-point detonation pedestrian protection device at the front and rear ends of a vehicle hood, wherein the front and rear ends of the vehicle hood are respectively located near the front of the vehicle and near the front window of the vehicle, and is characterized in that it includes: a front end protection unit, including a front end drive hinge chain and a front end combination piece that are hinged to each other, the front end combination piece is arranged on the vehicle hood, the front end drive hinge chain includes a lock ring mounting plate and a front end connecting rod that are hinged at the beginning and the end, and the lock ring mounting plate piece is provided with a vehicle front lock ring, a rear end protection unit, including a rear end drive hinge chain and a rear end combination piece, the rear end combination piece is arranged on the vehicle hood, the rear end drive hinge chain includes a body connecting rod piece and a rear end connecting plate piece that are hinged at the beginning and the end, and the body connecting rod piece is hinged to a fixed sheet metal piece on the body, two telescopic detonators, and the two telescopic detonators are respectively correspondingly located below the front end combination piece and the rear end combination piece, wherein a movable slide groove is provided on the rear end combination piece, and the extension path of the movable slide groove is parallel to the direction of the tangent of the hinged rotation circle of the front end connecting rod, and the rear end drive hinge chain cooperates with the rear end combination piece through the movable cooperation with the movable slide groove.

[0008] Preferably, the front end coupling member and the front end connecting rod are hingedly connected, and the front end coupling member and the rear end coupling member are respectively provided with a front end guide flip arc waist groove and a rear end guide flip arc waist groove which are parallel to each other, the front end connecting rod and the rear end connecting plate are respectively movably arranged in the front end guide flip arc waist groove and the rear end guide flip arc waist groove, and the movable slide groove and the rear end guide flip arc waist groove are arranged toward the front window of the vehicle in sequence.

[0009] Furthermore, the front end coupling part has a pair of front end coupling folded edges both facing the front end driving hinge chain, so that the front end driving hinge chain is hinged to the end of the front end coupling part through the front end coupling folded edges, and the front end guide arc waist groove is formed on one front end coupling folded edge, and the other front end coupling folded edge is provided with a return prevention assembly, and the return prevention assembly has a return prevention pin which is retractable relative to the front end coupling folded edge, and when the return prevention pin is extended, the return prevention pin prevents the front end coupling part and the front end connecting rod from being hinged together through parts interference.

[0010] Furthermore, a return-blocking through hole is formed on a front end combining folding edge, and the return-blocking assembly also includes a connecting tube, a through-threaded member and a return-blocking spring. The connecting tube is passed through and arranged in the return-blocking through hole, and the connecting tube has a return-blocking channel extending in the same direction as itself, and the return-blocking channel has channel openings respectively located on both sides of the front end combining folding edge, the through-threaded member and the return-blocking pin are respectively passed through and arranged in the two channel openings, and the return-blocking pin has a threaded matching hole matching with the through-threaded member, the return-blocking spring is arranged in the return-blocking channel and extends along the length direction of the return-blocking channel, and the two ends of the return-blocking spring respectively abut against the opening of the threaded matching hole and the inner wall of the return-blocking channel.

[0011] Furthermore, the rear end connecting plate is provided with a guide pin rod which cooperates with the arc movement of the rear end guide arc waist groove, and the rear end coupling part is provided with a key-shaped buffer entity. The key-shaped buffer entity has a rod-shaped part which is arranged on the extension path of the rear end guide arc waist groove. The key-shaped buffer entity is used to buffer the impulse of the guide pin rod through deformation.

[0012] Furthermore, two deformation buffer surfaces are formed on the rod-shaped part of the key-shaped buffer entity, and the normal of the deformation buffer surface is perpendicular to the normal of the surface where the rear end guide flip arc waist groove is located. The two deformation buffer surfaces form a concave structure along the moving path of the guide flip pin rod. The two deformation buffer surfaces correspond to the guide flip pin rod, and the two deformation buffer surfaces are used to buffer the impulse of the guide flip pin rod.

[0013] Furthermore, the normal lines of the two deformation buffer surfaces and the tangent lines of the corresponding extension paths of the rear end guide arc waist grooves form different angles.

[0014] Preferably, the front end coupling member includes a three-dimensional pawl, which has an unhooking portion and a pair of symmetrical folded edges both facing the front end connecting rod, and one end of the three-dimensional pawl is rotatably set on the front end coupling member through a reset spring, and the unhooking portion is a free end formed by extending along the radial direction of rotation, and a pair of folded edges of the three-dimensional pawl are both formed with a claw hook portion facing the front end connecting rod, and the telescopic detonator corresponding to the front end coupling member corresponds to the unhooking portion, and a lap groove that overlaps with the claw hook portion is formed on the surface of the locking ring mounting plate, so that the front end driving hinge chain converges, and the lap groove is located on the surface of the locking ring mounting plate away from the front cover of the vehicle, and the unhooking portion is hit, so that the three-dimensional pawl rotates relative to the front end coupling member, so that the claw hook portion disengages from the overlapping fit with the lap groove.

[0015] Preferably, the locking ring mounting plate is also formed with a supporting folded edge, and the supporting folded edge is used to support and cooperate with the front end coupling member when the front end drives the hinge chain to converge.

[0016] The method for setting up the dual-point detonation pedestrian protection device at the front and rear ends of the vehicle hood based on the above device is characterized by comprising the following steps:

[0017] Step S1: respectively setting a front end protection unit and a rear end protection unit at the front end and the rear end of the bonnet;

[0018] Step S2: providing a telescopic detonator for detonating and starting the front-end driving hinge chain and the rear-end driving hinge chain to unfold, so that the telescopic detonator can be simultaneously started by a trigger signal;

[0019] Step S3: a front end joint and a rear end joint are arranged on the front cover of the vehicle, so that the front end joint and the rear end joint are respectively hinged to the ends of the front end driving hinge chain and the rear end driving hinge chain,

[0020] Among them, the front-end driving hinge chain and the rear-end driving hinge chain are formed by hingedly connecting a plurality of chain rods in sequence, and a movable slide groove is provided on the rear-end coupling member, so that the chain rod at the end of the rear-end driving hinge chain close to the front cover of the vehicle can be linearly movably arranged in the movable slide groove, so that the rear-end driving hinge chain can cooperate with the rear-end coupling member by moving in cooperation with the movable slide groove.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The front and rear end dual-point detonation pedestrian protection device of the vehicle hood of the present invention comprises a front protection unit, a rear protection unit and two telescopic detonators, the front protection unit comprises a front driving hinge chain and a front coupling member hinged to each other, the front coupling member is arranged on the vehicle hood, the front driving hinge chain comprises a locking ring mounting plate and a front connecting rod hinged to each other, the locking ring mounting plate is provided with a front locking ring, the rear protection unit comprises a rear driving hinge chain and a rear coupling member, the rear coupling member is arranged on the vehicle hood, the rear driving hinge chain comprises a body connecting rod and a rear connecting plate hinged to each other, the body connecting rod is hinged to a fixed sheet metal member on the body, the two telescopic detonators are respectively correspondingly located below the front coupling member and the rear coupling member, the rear coupling member is provided with a movable slide groove, and the extension path of the movable slide groove is parallel to the direction of the tangent of the hinged rotation circle of the front connecting rod, The rear end driving hinge chain cooperates with the rear end coupling part through the movement cooperation with the moving slide groove. Therefore, the present invention provides a front end driving hinge chain and a rear end driving hinge chain that can be driven to unfold by two telescopic detonators that can be simultaneously detonated and started, and when the front end driving hinge chain is unfolded and lifted up, the front end driving hinge chain can be adapted to the movement of the front end driving hinge chain through the moving slide groove, that is, when the chain rods of the front end driving hinge chain are relatively hinged and rotated to open, the moving slide groove can make the chain rods of the rear end driving hinge chain have linear movement freedom in a direction parallel to the tangent of the former rotation direction, so that the front end driving hinge chain and the rear end driving hinge chain can be coordinated and not conflict when lifting the front end driving hinge chain, so that the impact on the pedestrian's head when hitting the front end of the vehicle or the body of the vehicle near the front end is greatly reduced, thereby avoiding most personal injuries.

[0023] 2. Because the front end coupling member and the front end connecting rod of the present invention are hingedly connected, the front end coupling member and the rear end coupling member are respectively provided with a front end guide flip arc waist groove and a rear end guide flip arc waist groove which are parallel to each other, and the front end connecting rod and the rear end connecting plate are respectively arranged in the front end guide flip arc waist groove and the rear end guide flip arc waist groove which can be moved in an arc shape, so that when the hood moves linearly in the moving slide groove, the hood is simultaneously flipped by the arc guidance of the front end guide flip arc waist groove and the rear end guide flip arc waist groove. Therefore, the hood of the present invention realizes the flipping of the hood by the front end guide flip arc waist groove and the rear end guide flip arc waist groove while continuously moving linearly close to the front window, so that not only the edge of the hood will not collide with the front window, but also the hood near the front window is lifted up to a higher height, that is, the entire hood is flipped as a whole with a larger buffer protection distance.

[0024] 3. Because the rear end connecting plate of the present invention has a guide pin rod that cooperates with the arc movement of the rear end guide arc waist groove, and the rear end coupling part has a key-shaped buffer entity, the key-shaped buffer entity has a rod-shaped part that is arranged on the extension path of the rear end guide arc waist groove, and the key-shaped buffer entity is used to buffer the impulse of the guide pin rod through deformation. Therefore, the present invention can greatly reduce the impact of the guide pin rod on the overall structure by buffering the impulse of the guide pin rod, thereby greatly extending the service life of the rear end drive hinge chain.

[0025] 4. Because two deformation buffer surfaces are formed on the rod-shaped part of the key-shaped buffer entity of the present invention, the normal of the deformation buffer surface is perpendicular to the normal of the surface where the rear end guide flip arc waist groove is located, and the two deformation buffer surfaces form a concave structure along the moving path of the guide flip pin rod. The two deformation buffer surfaces correspond to the guide flip pin rod, and the two deformation buffer surfaces are used to buffer the impulse of the guide flip pin rod. Therefore, when the key-shaped buffer entity buffers the guide flip pin rod, the two deformation buffer surfaces simultaneously provide a buffering reaction force to the guide flip pin rod, thereby further reducing the impact of the guide flip pin rod on the overall structure.

[0026] 5. Because the normals of the two deformation buffer surfaces of the present invention form different angles with the tangents of the extension path of the corresponding rear end guide flip arc waist groove, the kinetic energy of the guide flip pin rod increases sharply during the movement of the guide flip pin rod, and at different stages of buffering, the deformation buffer surface of the key-shaped buffer entity causes the deformation buffer surface that provides the main buffer reaction force for the guide flip pin rod to switch due to the surface deformation. Therefore, in the early stage of buffering, the direction of the deformation buffer surface that provides the main buffer reaction force is relatively small or even close to zero with the tangent of the extension path of the rear end guide flip arc waist groove, so as to adapt to the smaller kinetic energy of the guide flip pin rod. Impact; and in the later stage of buffering, the deformation buffer surface providing the main buffering reaction force is switched, so that the direction of the new deformation buffer surface providing the main buffering reaction force and the tangent angle of the extension path of the rear end guide arc waist groove should reach a predetermined angle value as much as possible to adapt to the larger kinetic energy impact of the guide pin rod. Therefore, the present invention adapts to the kinetic energy impact of the guide pin rod in different buffering stages through two deformation buffer surfaces, so that the speed of the guide pin rod will not change drastically during the whole process of movement, thereby maintaining the implementation of the present invention without causing large vibration of the front cover of the vehicle, thereby ensuring a good user experience.

[0027] 6. Because the front end coupling member of the present invention includes a three-dimensional pawl, the three-dimensional pawl has an unhooking portion, and a pair of symmetrical folded edges both facing the front end connecting rod, and one end of the three-dimensional pawl is rotatably set on the front end coupling member through a reset spring, the unhooking portion is a free end formed by extending along the radial direction of rotation, and the pair of folded edges of the three-dimensional pawl are both formed with a claw hook portion facing the front end connecting rod, the telescopic detonator corresponding to the front end coupling member corresponds to the unhooking portion, and the surface of the lock ring mounting plate is formed with an overlapping groove that overlaps with the claw hook portion, so that the front end driving hinge chain converges, and the overlapping groove is located on the surface of the lock ring mounting plate away from the front cover of the vehicle, and the unhooking portion is formed. The part is hit, so that the three-dimensional pawl rotates relative to the front end coupling part, so that the claw hook part is disengaged from the overlapping fit with the overlapping groove. Therefore, the present invention makes the front end drive hinge chain converge through the overlapping fit of the claw hook part and the overlapping groove, and when the telescopic detonator hits the unhooking part, the three-dimensional pawl rotates relative to the front end coupling part, so that the claw hook part is disengaged from the overlapping fit with the overlapping groove; the telescopic detonator continues to pop out and hit the front end coupling part, thereby driving the front end drive hinge chain to be hinged and unfolded, that is, through one action of the telescopic detonator, the combined effect of sequentially releasing the convergence state of the front end drive hinge chain and hitting the front end coupling part is achieved.

[0028] 7. Because a limited position protrusion is formed at the end of the front end connecting rod near the lock ring mounting plate of the present invention, when the front end connecting rod and the lock ring mounting plate are relatively unfolded to form a predetermined angle, the limited position protrusion interferes with the lock ring mounting plate, thereby stopping the unfolding. A stop hole and a stop sheet spring are provided on the rear end connecting plate. One end of the stop sheet spring is fixed to the rear end connecting plate, and a stop pin is formed at the other end. The stop pin is inserted into the stop hole. The rear end coupling member and the rear end connecting plate overlap, and the rear end coupling member presses against the stop pin, thereby causing the stop spring sheet to warp and store energy. When the rear end driving hinge chain is hinged open, the rear end coupling and the rear end connecting plate are relatively separated and no longer overlapped, and when the rear end coupling no longer presses against the anti-falling pin, the anti-falling pin elastically extends out from the anti-falling through hole, and its peripheral surface interferes with the lower edge contour line of the rear end coupling, thereby forming a lower support for the rear end coupling. Therefore, the present invention realizes the expansion limit of the front end driving hinge chain by the limiting protrusion, and the support of the anti-falling pin enables the rear end coupling to maintain a predetermined angle relative to the rear end connecting plate, so that the front cover of the rear vehicle maintains a stable raised position. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a telescopic detonator of the prior art;

[0030] Figure 2 It is a schematic diagram of the assembly of the front and rear end double-point detonation pedestrian protection device of the vehicle hood and the vehicle hood according to an embodiment of the present invention (convergence state);

[0031] Figure 3 It is a schematic diagram of the assembly of the front and rear end double-point detonation pedestrian protection device of the vehicle hood and the vehicle hood according to an embodiment of the present invention (in the unfolded state);

[0032] Figure 4 is a schematic diagram of a front-end protection unit according to an embodiment of the present invention (convergence state);

[0033] Figure 5 is a schematic diagram of a front-end protection unit according to an embodiment of the present invention (in an unfolded state);

[0034] Figure 6 for Figure 5 Stereoscopic representation of Figure 1 ;

[0035] Figure 7 for Figure 6 Exploded diagram of

[0036] Figure 8 for Figure 5 Stereoscopic representation of Figure 2 ;

[0037] Fig. 9 for Figure 8 A partial exploded view of

[0038] Fig.10 is a cross-sectional view of a combined assembly of an embodiment of the present invention;

[0039] Fig.11 is a schematic diagram of a backend protection unit according to an embodiment of the present invention (convergence state);

[0040] Fig.12 is a schematic diagram of a rear end protection unit according to an embodiment of the invention (in an unfolded state);

[0041] Fig.13 for Fig.11 Stereoscopic representation of Figure 1 ;

[0042] Fig.14 for Fig.11 Stereoscopic representation of Figure 2 ;

[0043] Fig.15 It is a schematic diagram of the steps of a method for setting a dual-point detonation pedestrian protection device at the front and rear ends of a vehicle hood according to an embodiment of the present invention.

[0044] In the figure: H, front cover, 10, front end protection unit, 11, front end combination, 11a, front end combination folding edge, 111, front end guide arc waist groove, 112, three-dimensional ratchet, 1121, claw hook part, 1122, unhooking part, 113, anti-return component, 1131, connecting tube, 11311, anti-return channel, 11312, inner step, 11313, positioning flange, 1132, threaded part, 1133, anti-return pin, 1134, anti-return spring, 12, front end drive hinge chain, 121, lock ring mounting plate, 1211, front lock ring, L, lock body device, 1212, overlapping groove, 1213, supporting folding edge, 122. Front end connecting rod, 1221. Limiting protrusion, 20. Rear end protection unit, 21. Rear end coupling part, 21a. Rear end coupling folding edge, 211. Moving slide groove, 212. Rear end guide arc waist groove, 213. Key-shaped buffer entity, 213a. Buffer bending part, 22. Rear end driving hinge chain, 221. Rear end connecting plate, S. Shear pin, 2211. Guide pin rod, 2212. Anti-fall through hole, 2213. Anti-fall sheet spring, 2213a. Anti-fall pin, 222. Vehicle body connecting rod, F. Fixed sheet metal, 30. Telescopic detonator, S100. Method for setting up double detonation pedestrian protection device at front and rear ends of vehicle hood. DETAILED DESCRIPTION

[0045] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments and the accompanying drawings specifically illustrate the front and rear end dual-point detonation pedestrian protection device of the vehicle hood of the present invention. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0046] like Figure 2 and Figure 3 As shown, the front and rear ends of the vehicle hood H in this embodiment have dual detonation pedestrian protection devices, and the front and rear ends of the vehicle hood H are respectively located near the front of the vehicle and near the front window of the vehicle, and include a front protection unit 10, a rear protection unit 20 and two telescopic detonators 30.

[0047] like Figures 4 to 8 As shown, the front end protection unit 10 includes a front end connecting member 11 and a front end driving hinge chain 12 which are hinged to each other.

[0048] The front end connector 11 is arranged on the front hood H of the vehicle. The front end connector 11 is provided with a front end guide arc waist groove 111, a three-dimensional pawl 112 and a return resistance component 113. The front end connector 11 has a pair of front end connector folded edges 11a which are symmetrical and both face the front end driving hinge chain 12. The front end driving hinge chain 12 is hinged to the end of the front end connector 11 through the front end connector folded edges 11a. Specifically, the front end connector 11 is a sheet metal part.

[0049] The front end guide arc waist groove 111 is formed on the front end combining folded edge 11a, and the front end guide arc waist groove 111 and the anti-return component 113 are respectively formed on a pair of front end combining folded edges 11a, and a front end combining folded edge 11a is formed with an anti-return through hole (not shown in the drawings) for cooperating with the anti-return component 113.

[0050] The three-dimensional pawl 112 has a hook-release portion 1122 and a pair of symmetrical folded edges both facing the front end driving hinge chain 12, and one end of the three-dimensional pawl 112 is rotatably set on the front end coupling 11 through a reset spring (not shown in the drawings), the hook-release portion 1122 is a free end formed by extending along the radial direction of rotation, and a pair of folded edges of the three-dimensional pawl 112 are both formed with a hook portion 1121 facing the front end driving hinge chain 12, specifically, the three-dimensional pawl 112 is located between a pair of front end coupling folded edges 11a.

[0051] The front-end driving hinge chain 12 includes a locking ring mounting plate 121 and a front-end connecting rod 122 which are hinged at both ends. Specifically, the front-end coupling member 11 and the front-end connecting rod 122 are hingedly connected, and the front-end connecting rod 122 is arranged inside the front-end guide arc waist groove 111 so as to be movable in an arc through the cooperation of a pin rod.

[0052] like Fig. 9 and Fig.10As shown, the anti-return assembly 113 includes a connecting tube 1131 , a threaded member 1132 , an anti-return pin 1133 and an anti-return spring 1134 .

[0053] The connecting tube 1131 is disposed in the anti-return through hole, and has an anti-return channel 11311 , an inner step 11312 and a positioning flange 11313 .

[0054] The anti-return channel 11311 extends in the same direction as the connecting tube 1131, and has channel openings (not shown in the drawings) respectively located on opposite sides of the front end combining folded edge 11a. Specifically, an inner step 11312 is formed on the anti-return channel 11311 and is located on the outer side of the front end combining folded edge 11a. A positioning flange 11313 is formed on the outer peripheral surface of the connecting tube 1131. When the connecting tube 1131 passes through the anti-return through hole, the positioning flange 11313 is fixedly connected to the outer surface of the front end combining folded edge 11a.

[0055] The through-thread member 1132 and the anti-return pin 1133 are respectively arranged in the two channel openings. Specifically, the through-thread member 1132 is located on the outside of the front end combined folded edge 11a, the through-thread member 1132 is close to the inner step 11312, and the anti-return pin 1133 is located on the inside of the front end combined folded edge 11a.

[0056] The anti-return pin 1133 has a threaded mating hole (not shown in the drawings) that cooperates with the through-threaded member 1132. The anti-return spring 1134 is arranged in the anti-return channel and extends along the length direction of the anti-return channel. The two ends of the anti-return spring 1134 respectively abut against the mouth of the threaded mating hole and the inner wall of the anti-return channel, so that the anti-return pin 1133 is retractable relative to the front end combined with the folded edge 11a. Specifically, the two ends of the anti-return spring 1134 respectively abut against the mouth of the threaded mating hole and the inner wall of the inner step 11312.

[0057] The lock ring mounting plate 121 is provided with a front lock ring 1211 , an overlapping groove 1212 and a supporting folded edge 1213 .

[0058] Specifically, the front lock ring 1211 is locked with a lock device L pre-installed on the vehicle body, and in normal use, the user opens it by using a key or sending a related signal.

[0059] The overlapping groove 1212 is located on the surface of the lock ring mounting plate 121 away from the front cover H of the vehicle, and the overlapping groove 1212 overlaps with the claw hook portion 1121, so that the front end driving hinge chain 12 remains converged, and the unhooking portion 1122 is hit, causing the three-dimensional pawl 112 to rotate relative to the front end coupling member 11, so that the claw hook portion 1121 is disengaged from the overlapping cooperation with the overlapping groove 1212, and then the front end driving hinge chain 12 is driven to hinge and rotate and unfold by continuing to push the three-dimensional pawl 112.

[0060] The supporting folded edge 1213 is used to support and cooperate with the front end coupling member 11 when the front end driving hinge chain converges.

[0061] A limiting protrusion 1221 is formed at the end of the front end connecting rod 122 near the locking ring mounting plate 121. When the front end connecting rod 122 and the locking ring mounting plate 121 are relatively unfolded to form a predetermined angle, the limiting protrusion 1221 interferes with the locking ring mounting plate 121, thereby stopping the front end driving hinge chain 12 from unfolding. Specifically, when the claw hook portion 1121 cooperates with the overlapping groove 1212, the front end connecting rod 122 and the locking ring mounting plate 121 are adjacent to each other and their axes are parallel, forming a convergent state.

[0062] When the anti-return pin 1133 is extended, the anti-return pin 1133 prevents the front end coupling member 11 and the front end connecting rod 122 from being hinged together through the interference of parts. Specifically, when the claw hook portion 1121 cooperates with the overlapping groove 1212, the front end coupling member 11 and the front end connecting rod 122 also converge. At this time, the anti-return pin 1133 is blocked by the front end connecting rod 122 and retracts into the anti-return channel 11311. The anti-return spring 1134 is in an energy storage and compressed state. When the three-dimensional pawl 112 is lifted up by the external detonator, When the front end coupling 11 and the front end connecting rod 122 are released from the retracted state and unfolded, the anti-return pin 1133 is no longer blocked by the front end connecting rod 122, but pops out due to the energy release of the anti-return spring 1134. Therefore, when the front end coupling 11 falls back to the front end connecting rod 122 due to external force or vibration, the anti-return pin 1133 prevents the front end coupling 11 and the front end connecting rod 122 from entering the retracted state again through the interference of parts, thereby ensuring the supporting strength of the upper surface of the front end coupling 11.

[0063] like Figures 11 to 14 As shown, the rear end protection unit 20 includes a rear end coupling member 21 and a rear end driving hinge chain 22 .

[0064] The rear end coupling part 21 is arranged on the front cover H of the vehicle. The rear end coupling part 21 has a movable slide groove 211, a rear end guide flip arc waist groove 212 and a key-shaped buffer entity 213. The rear end coupling part 21 is a sheet metal part, and has a rear end coupling folded edge 21a bent and extended toward the rear end driving hinge chain 22. The movable slide groove 211, the rear end guide flip arc waist groove 212 and the key-shaped buffer entity 213 are all formed on the rear end coupling folded edge 21a. The rear end driving hinge chain 22 is hinged to the end of the front end coupling part 21 through the rear end coupling folded edge 21a, and the movable slide groove 211 and the rear end guide flip arc waist groove 212 are arranged toward the front window H of the vehicle in sequence.

[0065] Specifically, the extension path of the movable slide groove 211 is parallel to the direction of the tangent of the hinged rotation circle of the front end connecting rod 122, and the rear end driving hinge chain 22 cooperates with the rear end coupling member 21 through the movement of the movable slide groove 211. The rear end connecting plate 221 is arranged in the rear end guide flip arc waist groove 211 in an arc-shaped manner. The rear end guide flip arc waist groove 212 and the front end guide flip arc waist groove 111 are parallel to each other, that is, they are parallel arcs. When the front end driving hinge chain 12 is unfolded, the front end connecting rod 122 rotates relative to the lock ring mounting plate 121, that is, relative to the vehicle body, driving the front cover H to rotate along the tangent of the hinged rotation circle of the front end connecting rod 122 The movable slide groove 211 provides the freedom of linear motion, and when the hood H moves, the rear end guide arc waist groove 212 guides the hood H to flip at the same time, so that the rear end coupling 21 and the rear end driving hinge chain 22 are in a "Z" shape. At the same time, the rear end hood H drives the front end coupling 11, and the front end coupling 11 realizes relative rotation relative to the front end connecting rod 122 through the front end guide arc waist groove 111 and the movement coordination of the front end connecting rod 122, so that the front end coupling 11 and the front end driving hinge chain 12 are also synchronously in a "Z" shape, thereby realizing the hood H being synchronously and coordinately lifted up at the front and rear ends of the hood H.

[0066] The rear end combined folded edge 21a is connected with the rear end driving hinge chain 22 through the shear pin S, so that the rear end driving hinge chain 22 is converged and matched.

[0067] The key-shaped buffer entity 213 is fixedly mounted on the surface of the rear end coupling member 21 and has a rod-shaped portion arranged on the extension path of the rear end guide arc waist groove 212.

[0068] The rear end driving hinge chain 22 includes a body connecting rod 222 and a rear end connecting plate 221 which are hinged at the head and tail. The body connecting rod 222 is hinged to a fixed sheet metal part F on the body. The rear end combined folding edge 21a is connected to the rear end connecting plate 221 through a shear pin S.

[0069] The rear end connecting plate 221 has a guide pin 2211 , a stop hole 2212 and a stop spring 2213 .

[0070] Specifically, the flip guide pin rod 2211 cooperates with the rear end flip guide arc waist groove 212 to achieve flipping guidance of the rear end coupling member 21 .

[0071] The key-shaped buffer entity 213 is used to buffer the impulse of the guide flip pin rod 2211 through surface deformation. Two deformation buffer surfaces (not shown in the drawings) are formed on the rod-shaped part of the key-shaped buffer entity 213. The normal of the deformation buffer surface is perpendicular to the normal of the surface where the rear end guide flip arc waist groove 212 is located. The two deformation buffer surfaces form a concave structure along the moving path of the guide flip pin rod 2211. The two deformation buffer surfaces correspond to the circumferential surface of the guide flip pin rod 2211, and the normals of the two deformation buffer surfaces form different angles with the tangents of the extension path of the corresponding rear end guide flip arc waist groove 212. The two deformation buffer surfaces are used to buffer the impulse of the guide flip pin rod 2211.

[0072] One end of the anti-fall sheet spring 2213 is fixed on the rear end connecting plate 221, and the other end is formed with an anti-fall pin 2213a, which is inserted into the anti-fall through hole 2212. The rear end coupling 21 and the rear end connecting plate 221 overlap, and the rear end coupling 21 presses against the anti-fall pin 2213a, thereby causing the anti-fall sheet spring 2213 to warp and store energy.

[0073] The two telescopic detonators 30 are respectively located below the front end coupling 11 and the rear end coupling 21 , and the telescopic detonator 30 corresponding to the front end coupling 11 corresponds to the unhooking portion 1122 , and the unhooking portion 1122 is located between the telescopic detonator 30 and the front end coupling 11 .

[0074] Specifically, when the collision sensor sends out a trigger signal, the two telescopic detonators 30 are triggered synchronously by the trigger signal, and the movable section sleeve corresponding to the front end coupling member 11 first hits the unhooking portion 1122, so that the three-dimensional ratchet 112 rotates relative to the front end coupling member 11, so that the claw hook portion 1121 is separated from the overlapping cooperation with the overlapping groove 1212; then, the movable section sleeve continues to pop out and hit the front end coupling member 11, thereby driving the front end driving hinge chain 12 to hinge and unfold, and the front cover H is lifted up, and when the front end coupling member 11 and the front end connecting rod 122 rotate relative to each other to form a flipping support for the front cover H, the movable section sleeve forms a stable support for the front end coupling member 11, so that the flipping support state is stable; the movable section sleeve corresponding to the rear end coupling member 21 The segment sleeve hits the rear end coupling 21, and the shear pin S between the rear end coupling fold 21a and the rear end driving hinge chain 22 is disconnected due to the impact force, and then the movable segment sleeve continues to hit the rear end coupling 21, so that the rear end driving hinge chain 22 is hinged and unfolded. When the rear end coupling 21 is relatively separated from the rear end connecting plate 221 and no longer overlaps, and when the rear end coupling 21 no longer presses against the anti-falling pin 2213a, the anti-falling pin 2213a elastically extends out from the anti-falling through hole 2212, and its circumferential surface interferes with the lower edge contour line of the rear end coupling 21, thereby forming a lower support for the rear end coupling 21, so that the rear end coupling 21 and the rear end connecting plate 221 maintain a relative unfolding angle, that is, forming a stable support for the front cover H.

[0075] like Fig.15 As shown, the method S100 for setting up the double-point detonation pedestrian protection device at the front and rear ends of the vehicle hood is based on the above-mentioned device, and is characterized in that it includes the following steps:

[0076] Step S1: a front end protection unit 10 and a rear end protection unit 20 are respectively arranged at the front end of the bonnet and the rear end of the bonnet.

[0077] Step S2: a telescopic detonator 30 is provided for detonating and starting the front-end driving hinge chain 12 and the rear-end driving hinge chain 22 to unfold, so that the telescopic detonator 30 can be simultaneously started by a trigger signal. In the present embodiment, there are two telescopic detonators 30, corresponding to the front-end driving hinge chain 12 and the rear-end driving hinge chain 22, respectively.

[0078] Step S3: a front end connector 11 and a rear end connector 21 are arranged on the hood H, so that the front end connector 11 and the rear end connector 21 are hinged to the ends of the front end driving hinge chain 12 and the rear end driving hinge chain 22 respectively.

[0079] The front-end driving hinge chain 12 and the rear-end driving hinge chain 22 are both formed by hingedly connecting a plurality of chain rods in sequence. A movable slide groove 211 is provided on the rear-end coupling member so that the chain rod at the end of the rear-end driving hinge chain 22 near the front hood H can be linearly movably arranged in the movable slide groove 211, so that the rear-end driving hinge chain 22 can cooperate with the rear-end coupling member 21 by moving in cooperation with the movable slide groove 211.

[0080] The above-mentioned implementation modes are preferred cases of the present invention and are not used to limit the protection scope of the invention. Various deformations or modifications that can be made by ordinary technicians in this field without creative work within the scope of the attached claims are still within the protection scope of this patent.

Claims

1. A double-point detonation pedestrian protection device at the front and rear ends of the vehicle hood, wherein the front and rear ends of the vehicle hood are respectively located near the front of the vehicle and near the front window of the vehicle, and is characterized in that: include: The front end protection unit comprises a front end driving hinge chain and a front end joint piece which are hinged to each other. The front end joint piece is arranged on the front cover of the vehicle. The front end driving hinge chain comprises a locking ring mounting plate which is hinged to the front and rear and a front end connecting rod. The locking ring mounting plate is provided with a front locking ring. The rear end protection unit comprises a rear end driving hinge chain and a rear end coupling member, wherein the rear end coupling member is arranged on the front cover of the vehicle, the rear end driving hinge chain comprises a body connecting rod member and a rear end connecting plate member which are hinged at the head and tail, and the body connecting rod member is hinged to a fixed sheet metal member on the body, Two telescopic detonators, the two telescopic detonators are respectively located below the front end combination piece and the rear end combination piece, Among them, the rear end coupling member has a movable slide groove, and the extension path of the movable slide groove is parallel to the direction of the tangent of the hinged rotating circle of the front end connecting rod, and the rear end driving hinge chain cooperates with the rear end coupling member through movable cooperation with the movable slide groove.

2. The double-point detonation pedestrian protection device at the front and rear ends of the vehicle hood according to claim 1 is characterized in that: in, The front end coupling member and the front end connecting rod are hingedly connected, and the front end coupling member and the rear end coupling member are respectively provided with a front end guide flip arc waist groove and a rear end guide flip arc waist groove which are parallel to each other, the front end connecting rod and the rear end connecting plate are respectively movably arranged in the front end guide flip arc waist groove and the rear end guide flip arc waist groove in an arc shape, and the movable slide groove and the rear end guide flip arc waist groove are arranged toward the front window of the vehicle in sequence.

3. The double-point detonation pedestrian protection device at the front and rear ends of the vehicle hood according to claim 2 is characterized in that: in, The front end coupling member has a pair of front end coupling folding edges both facing the front end driving hinge chain, so that the front end driving hinge chain is hinged to the end of the front end coupling member through the front end coupling folding edges. The front end guide arc waist groove is formed on one of the front end combining folding edges, and the other front end combining folding edge is provided with a return prevention component, which has a return prevention pin which is retractable relative to the front end combining folding edge. When the return prevention pin is extended, the return prevention pin prevents the front end combining part and the front end connecting rod from being hinged together through parts interference.

4. The double-point detonation pedestrian protection device at the front and rear ends of the vehicle hood according to claim 3 is characterized in that: in, A return-blocking through hole is also formed on the front end joint folding edge. The anti-return assembly also includes a connecting tube, a threaded member and an anti-return spring. The connecting tube is arranged in the anti-return through hole, and the connecting tube has an anti-return channel extending in the same direction as the connecting tube, and the anti-return channel has channel openings respectively located on both sides of the front end combined folding edge. The threaded member and the anti-return pin are respectively arranged in the two passage openings, and the anti-return pin has a threaded matching hole that matches the threaded member. The anti-return spring is arranged in the anti-return channel and extends along the length direction of the anti-return channel. Two ends of the anti-return spring are respectively in contact with the mouth of the threaded matching hole and the inner wall of the anti-return channel.

5. The double-point detonation pedestrian protection device at the front and rear ends of the vehicle hood according to claim 2 is characterized in that: in, The rear end connecting plate is provided with a guide pin rod which is matched with the rear end guide arc waist groove arc line movement. The rear end coupling member is provided with a key-shaped buffer entity, which has a rod-shaped portion arranged on the extension path of the rear end guide flip arc waist groove, and the key-shaped buffer entity is used to buffer the impulse of the guide flip pin rod through deformation.

6. The double-point detonation pedestrian protection device at the front and rear ends of the vehicle hood according to claim 5 is characterized in that: in, Two deformation buffer surfaces are formed on the rod-shaped part of the key-shaped buffer entity, and the normal of the deformation buffer surface is perpendicular to the normal of the surface where the rear end guide flip arc waist groove is located. The two deformation buffer surfaces form a concave structure along the moving path of the guide flip pin rod. The two deformation buffer surfaces both correspond to the guide flip pin rod, and the two deformation buffer surfaces are both used to buffer the impulse of the guide flip pin rod.

7. The double-point detonation pedestrian protection device at the front and rear ends of the vehicle hood according to claim 6 is characterized in that: in, The normal lines of the two deformation buffer surfaces and the corresponding tangent lines of the extension paths of the rear end guide arc waist grooves form different angles.

8. The double-point detonation pedestrian protection device at the front and rear ends of the vehicle hood according to claim 1 is characterized in that: in, The front end coupling member includes a three-dimensional pawl, the three-dimensional pawl has an unhooking portion, and a pair of symmetrical folded edges both facing the front end connecting rod, and one end of the three-dimensional pawl is rotatably arranged on the front end coupling member through a reset spring, the unhooking portion is a free end formed by extending along the radial direction of rotation, and the pair of folded edges of the three-dimensional pawl are both formed with a claw hook portion facing the front end connecting rod, and the telescopic detonator corresponding to the front end coupling member corresponds to the unhooking portion, The surface of the lock ring mounting plate is formed with an overlapping groove that overlaps with the claw hook portion, so that the front end drive hinge chain converges. The overlapping groove is located on the surface of the lock ring mounting plate away from the front cover of the vehicle. The unhooking portion is hit, causing the three-dimensional pawl to rotate relative to the front end coupling part, so that the claw hook portion disengages from the overlapping groove.

9. The double-point detonation pedestrian protection device at the front and rear ends of the vehicle hood according to claim 8 is characterized in that: in, The locking ring mounting plate is also formed with a supporting folded edge, and the supporting folded edge is used to support and cooperate with the front end coupling member when the front end driving hinge chain converges.

10. A method for setting a dual-point detonation pedestrian protection device at the front and rear ends of a vehicle hood based on the device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1: respectively arranging the front end protection unit and the rear end protection unit at the front end of the bonnet and the rear end of the bonnet; Step S2: providing a telescopic detonator for detonating and starting the front-end driving hinge chain and the rear-end driving hinge chain to unfold, so that the telescopic detonator can be simultaneously started by a trigger signal; Step S3: arranging the front end coupling member and the rear end coupling member on the front cover of the vehicle so that the front end coupling member and the rear end coupling member are respectively hinged to the ends of the front end driving hinge chain and the rear end driving hinge chain, Among them, the front-end driving hinge chain and the rear-end driving hinge chain are both formed by hingedly connecting a plurality of chain rods in sequence, and the movable slide groove is passed on the rear-end coupling member, so that the chain rod at the end of the rear-end driving hinge chain close to the front cover of the vehicle can be linearly movably arranged in the movable slide groove, so that the rear-end driving hinge chain can cooperate with the rear-end coupling member by moving in cooperation with the movable slide groove.

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