JPH11115680A - Flip-up hood - Google Patents

Abstract

(57) [PROBLEMS] Compared with conventional products, the collision energy of the secondary collision is reduced by reducing the reaction force against the obstacle when the obstacle colliding with the front part of the vehicle makes a secondary collision with the hood. A hood that can further absorb shock and reduce the impact of an obstacle at the time of a secondary collision. SOLUTION: There is provided collision detection means 16 for detecting a collision between a front portion of a vehicle 1 and an obstacle. A flip-up means 20 is provided for flipping up and holding the rear end 2b of the hood 2 from the vehicle body 3 based on a detection signal from the collision detection means 16. A hood lock mechanism 12 is provided for locking the front end 2a of the hood 2 to the vehicle body 3 with the hood 2 closed. A hinge mechanism 11 is provided which restrains the rear end 2b of the hood 2 toward the vehicle body 3 to support the hood 2 so that the hood 2 can be opened and closed, and releases the restraint as the flip-up means 20 operates. A holding release mechanism is provided to release the holding of the hood 2 by the flip-up means 20 when a load equal to or greater than the set load is applied to the hood 2 when the flip-up means 20 operates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the impact of an obstacle when a running vehicle collides with an obstacle (for example, a pedestrian) and the obstacle falls down on a hood and makes a secondary collision with the vehicle. The present invention relates to a flip-up hood for absorbing and relaxing to protect an obstacle.

[0002]

2. Description of the Related Art FIG. 24 shows an example of the prior art described in Japanese Utility Model Laid-Open No. 49-110432. In the flip-up hood A, a push-up rod D urged upward by a spring C and normally held at a lower position by a lock member E is disposed below the rear end of the hood B. At the time of collision between the front end and the obstacle, the lock of the lock member E is mechanically released by the impact force, the push-up rod D rises, and the rear end of the hood B jumps up.

[0003] Therefore, when the vehicle collides with an obstacle such as a pedestrian or the like, the flip-up hood A jumps up the rear end of the hood B to provide a space between the hood B and a structure in the engine room. , The obstacle such as a pedestrian falls on the hood and the impact of the obstacle at the time of the secondary collision with the vehicle can be absorbed and mitigated.

[0004]

However, when an obstacle, such as a pedestrian, collides with the hood in a secondary manner, the flip-up hood A pushes up the absorption of the collision energy to prevent the rod D from interfering. However, there is a problem that a reaction force is generated against obstacles such as pedestrians.

Therefore, in the present invention, the collision energy of the secondary collision is more absorbed by reducing the reaction force against the obstacle when the obstacle collides with the hood in the secondary as compared with the conventional product shown in FIG. It is another object of the present invention to provide a flip-up hood that can further reduce the impact of an obstacle at the time of a secondary collision.

[0006]

As means for solving the above problems, according to the invention of claim 1, a hood provided at a front portion of a vehicle, and a hood provided by restraining a rear portion of the hood to a vehicle body side. A hinge mechanism that is openably and closably supported and the restraint is released by a flipping force, and a hood lock mechanism that locks a front end of the hood to a vehicle body with the hood closed.
Collision detecting means for detecting a collision between a front part of the vehicle and an obstacle, and applying the bouncing force to a rear part of the hood based on a detection signal from the collision detecting means to cause the rear end of the hood to fly up from the vehicle body A flip-up hood having a flip-up hood for holding, wherein when a load exceeding a set load is applied to the hood when the flip-up means is activated, a release of the hood by the flip-up means is released. The structure that the mechanism was provided is adopted.

According to the first aspect of the present invention, the hinge mechanism normally restricts the rear portion of the hood to the vehicle body and supports the hood so that the hood can be opened and closed. By releasing the lock, the front end of the hood can be freely opened and closed in the vertical direction.

If the front of the vehicle collides with an obstacle,
This collision is detected by the collision detection means, and the flip-up means operates based on the detection signal to apply a flip-up force to the rear part of the hood. With this flip-up force, the restraint of the rear part of the hood by the hinge mechanism is released, and the hood is released. The rear end is flipped up from the vehicle body and held.

At this time, when an obstacle colliding with the front part of the vehicle falls on the hood and a load exceeding a set load acts on the hood, the holding release mechanism releases the holding of the hood by the flip-up means. The reaction force of the jumping means against the load is reduced.

According to a second aspect of the present invention, in the flip-up hood according to the first aspect, the hinge mechanism includes a hood-side link provided at a rear portion of the hood and a vehicle-body-side link provided at the vehicle body. And one end is slidably connected to the vehicle body side link and the other end is rotatably connected to the hood side link via a fulcrum pin. An intermediate link for holding the end at a flip-up position, and a fulcrum pin provided on the vehicle body-side link for rotatably locking the hood to restrain the rear portion of the hood toward the vehicle body and supporting the hood so that the hood can be opened and closed; And a fulcrum pin lock mechanism in which the lock is released with the operation of.

According to the second aspect of the present invention, the hinge mechanism comprises:
Normally, the fulcrum pin lock mechanism provided on the body side link locks the fulcrum pin rotatably, restrains the rear part of the hood on the vehicle body side, and supports the hood so that it can be opened and closed, so the fulcrum pin rotates Enables opening and closing of the front end of the hood as a center.

When the front portion of the vehicle collides with an obstacle and the flip-up means operates, the hinge mechanism unlocks the fulcrum pin by the fulcrum pin lock mechanism, and the hinge mechanism is slidably coupled to the vehicle body side link. One end of the link slides, the other end of the intermediate link rotatably coupled to the hood side link via a fulcrum pin rotates, and the intermediate link rises, and the rear end of the hood is raised by the rise of the intermediate link. In the flip-up position.

According to a third aspect of the present invention, there is provided the flip-up hood according to the second aspect, wherein the flip-up means includes a push-up member for flipping and holding a rear end of the hood from a vehicle body, and the holding release. The mechanism is a groove provided on the push-up member and serving as a starting point of deformation of the push-up member.

According to the third aspect of the present invention, when the front portion of the vehicle collides with an obstacle and the jumping-up means is activated, the push-up member jumps the rear end of the hood up from the vehicle body to move the intermediate portion. Hold in the flip-up position with the link. When the obstacle falls down on the hood and a load exceeding the set load acts on the hood, the push-up member is deformed starting from the concave groove.

According to a fourth aspect of the present invention, there is provided the flip-up hood according to the third aspect, wherein a plurality of the concave grooves are provided along a pushing direction of the pushing member.

Therefore, according to the fourth aspect of the present invention, when an obstacle that collides with the front portion of the vehicle falls down on the hood and collides with the vehicle in the middle while the rear end of the hood is being flipped up from the vehicle body by the push-up member. Also, the push-up member can be deformed starting from the groove.

According to a fifth aspect of the present invention, there is provided the flip-up hood according to the fourth aspect, wherein a holding portion for holding the standing intermediate link is provided on the vehicle body side link according to a flip-up position of a rear end of the hood. And a plurality of concave portions of the push-up member are arranged in correspondence with the respective holding portions in accordance with a flip-up position of the rear end of the hood.

According to the fifth aspect of the present invention, since a plurality of holding portions for holding the standing intermediate links are provided on the vehicle body side link in accordance with the position at which the rear end of the hood is flipped up, the push-up member allows the rear end of the hood to be moved from the vehicle body. Even if an obstacle colliding with the front part of the vehicle falls down on the hood during the jumping up and collides with the vehicle in a secondary manner, the push-up member can hold the hood together with the intermediate link.

In addition, according to the fifth aspect of the present invention, each concave groove of the push-up member is disposed in correspondence with each holding portion in accordance with the position at which the rear end of the hood is flipped up. Whichever of the holding portions is held, the push-up member can be deformed starting from the groove corresponding to the held holding portion.

According to a sixth aspect of the present invention, there is provided the flip-up hood according to any one of the third to fifth aspects, wherein the concave groove is formed over the entire circumference of the push-up member in the circumferential direction. It is characterized by the following.

Therefore, in the invention according to claim 6, even if an obstacle falls on the hood from any direction with respect to the hood at the time of the secondary collision, the push-up member is deformed starting from the concave groove portion. be able to.

According to a seventh aspect of the present invention, there is provided the flip-up hood according to the first or second aspect, wherein the flip-up means holds a rear end of the hood flipped up by a pressure fluid at a flip-up position. A pressure accumulating section for pressurized fluid is provided, and the holding release mechanism is a pressure reduction mechanism provided in the pressure accumulating section to reduce the pressure of the pressure accumulating section.

Therefore, in the invention according to claim 7, when the front portion of the vehicle collides with an obstacle and the jumping means operates, the rear end of the hood is jumped from the vehicle body by the pressure fluid of the jumping means, It is held at the flip-up position by the accumulator of the pressure fluid.

At this time, when an obstacle that collides with the front part of the vehicle falls on the hood and a load exceeding the set load acts on the hood, the pressure reduction mechanism provided in the pressure accumulating section for the pressurized fluid causes the pressure accumulating section to operate. The pressure is reduced, the holding of the hood by the jumping means is released, and the reaction force of the jumping means to the load is reduced.

An eighth aspect of the present invention is the flip-up hood according to the seventh aspect, characterized in that the hood is a relief valve for preventing a pressure increase above a set pressure of the pressure accumulating portion.

Therefore, according to the invention of claim 8, when an obstacle colliding with the front part of the vehicle falls on the hood and a load exceeding a set load acts on the hood, the obstacle is raised by the action of the load. By reducing the pressure of the pressure accumulating unit by the relief valve, the reaction force of the jumping means against the load can be reduced.

According to a ninth aspect of the present invention, there is provided the flip-up hood according to any one of the first to eighth aspects, wherein the flip-up hood is provided in an air box on a vehicle body side which is cut off from an engine room and communicates with outside air. It is characterized by having been provided.

Therefore, according to the ninth aspect of the present invention, it is possible to maintain and operate the flip-up means in an air box in which the temperature fluctuation is smaller than that in the engine room and the temperature during running of the vehicle is low.

[0029]

According to the first aspect of the present invention, when an obstacle colliding with the front portion of the vehicle falls on the hood and a load exceeding a set load acts on the hood, the holding release mechanism operates the hood by the jumping-up means. 24 is released, and the reaction force of the jumping means against the load is reduced. Therefore, as compared with the conventional product shown in FIG. The collision energy can be absorbed, and as a result, the impact of the obstacle at the time of the secondary collision can be further reduced.

According to the second aspect of the present invention, when the front portion of the vehicle collides with an obstacle and the flip-up means is activated, the intermediate link of the hinge mechanism stands up and holds the rear end of the hood at the flip-up position. Bounce of the rear end of the hood by the bounce means can be reliably stopped at the bounce position.

When an obstacle colliding with the front of the vehicle falls on the hood and collides with the vehicle in a secondary manner, the intermediate link is deformed to reduce the collision energy of the secondary collision and release the collision. Since the impact can be absorbed not only by the mechanism but also by the intermediate link, the impact of the obstacle at the time of the secondary collision can be further reduced.

According to the third aspect of the present invention, when the obstacle falls down on the hood and a load exceeding the set load acts on the hood, the push-up member is deformed starting from the concave groove portion. By absorbing the collision energy of the secondary collision with the vehicle, the impact of the obstacle at the time of the secondary collision can be reduced.

According to the fourth aspect of the present invention, an obstacle colliding with the front portion of the vehicle falls down on the hood and collides with the vehicle in a secondary collision while the push-up member is flipping up the rear end of the hood from the vehicle body. Also, since the push-up member can be deformed starting from the concave groove portion, the deformation can absorb the collision energy of the secondary collision and reduce the impact of the obstacle at the time of the secondary collision.

According to the fifth aspect of the invention, in the event of a secondary collision,
Regardless of the holding portion where the intermediate link is held, the push-up member can be deformed starting from the concave groove portion corresponding to the held holding portion, so that the deformation of the push-up member absorbs the collision energy of the secondary collision. Thus, the impact of the obstacle at the time of the secondary collision can be reduced.

Further, according to the fifth aspect of the present invention, even if an obstacle falls down on the hood and collides with the vehicle in the middle of the upward movement of the rear end of the hood by the push-up member, the push-up member and the intermediate link can be used together. By deforming the intermediate link at the time of the secondary collision, the collision energy of the secondary collision can be absorbed not only by the push-up member but also by the intermediate link. The impact of the obstacle can be further reduced.

According to the sixth aspect of the present invention, the thrust member can be deformed starting from the concave groove portion even if the obstacle falls on the hood from any direction with respect to the hood at the time of the secondary collision. Therefore, the collision energy of the secondary collision can be absorbed by the deformation, and the impact of the obstacle at the time of the secondary collision can be reduced.

According to the seventh aspect of the present invention, when an obstacle colliding with the front portion of the vehicle falls on the hood and a load exceeding a set load acts on the hood, a pressure reducing mechanism provided in the pressure accumulating portion of the pressurized fluid. As a result, the pressure of the pressure accumulating portion is reduced, and the reaction force of the jumping means against the load is reduced. Therefore, compared with the conventional product shown in FIG. The collision energy of the secondary collision can be absorbed, and as a result, the impact of the obstacle at the time of the secondary collision can be further reduced.

According to the present invention, when an obstacle colliding with the front portion of the vehicle falls on the hood and a load exceeding a set load acts on the hood, the pressure of the pressure accumulating portion raised by the action of the load is increased. Since the pressure can be reduced by the relief valve and the reaction force of the jumping means against the load can be reduced, the obstacle and the vehicle are extraly reduced by the reduced reaction force as compared with the conventional product shown in FIG. Can absorb the collision energy of the secondary collision, and as a result, the impact of the obstacle at the time of the secondary collision can be further reduced.

According to the ninth aspect of the present invention, the jumping means can be maintained and operated in an air box in which the temperature fluctuation is smaller than that in the engine room and the temperature is low while the vehicle is running. The reliability of the system can be improved by reducing the adverse effect on the system.

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 to 13 show a first embodiment which is an example of an embodiment in which the inventions according to claims 1 to 3 are implemented together. FIG. 1 shows a first embodiment. FIG. 2 is a schematic configuration diagram of an automobile provided with a flip-up hood according to the embodiment, and FIG.
FIG. 2 is a block diagram of a flip-up hood according to the first embodiment.

As shown in FIG. 1, an automobile 1 as a vehicle
Is provided with a hood 2 provided at a front portion thereof, and a hinge mechanism 11 to be described later is provided on both sides of the rear end of the hood 2 in the vehicle width direction Y. An actuator 20 is provided as a jumping-up means for applying a jumping force to the rear portion of the hood 2 at the time of a collision with an obstacle to jump up and hold the rear end 2 b of the hood 2 from the vehicle body 3.

The vehicle 1 also has a hood lock mechanism 12 at the center of the front end of the hood 2 for locking the front end 2a of the hood 2 to the vehicle body 3 with the hood 2 closed. Bumper sensor 1 for detecting collision
3 is also provided. And a speed sensor 1 for detecting a vehicle speed.
2 and the two detection signals from the bumper sensor 13 and the speed sensor 14 as shown in FIG.
A controller 15 for outputting a signal to 0 is also provided.

Here, the operation of the controller 15 will be described. FIG. 3 is a flowchart showing the operation of the controller 15. The controller 15 performs step S1
It is determined whether the vehicle speed V is higher than the set vehicle speed at
It is determined whether or not the bumper sensor 13 is ON in step S2, and if both are YES, the actuator 20 is operated in step S3.

The reason for setting the condition of the vehicle speed V in step S1 is to prevent the actuator 20 from being operated unnecessarily when a shock is applied to the stopped automobile 1 by mischief or the like. Therefore, the bumper sensor 13,
The speed sensor 14 and the controller 15 are provided with collision detecting means 16 for detecting that the tip of the vehicle 1 has collided with an obstacle.
Is composed.

FIGS. 4A and 4B are explanatory views of what is shown in FIG. 1, wherein FIG. 4A shows a state when the hood is closed, FIG. 4B shows a state when the hood is released, and FIG. Is shown.

As shown in FIG. 4, a hinge mechanism 11 arranged rearward of the strut tower 5 connecting the front suspension and the vehicle body 3 in the vehicle front-rear direction X usually places the hood 2 in a fixed position on the vehicle body 3 side. When the front end of the vehicle 1 collides with an obstacle, the restraint is released with the operation of the actuator 20, and the intermediate link 60 described later stands up and the hood 2 together with the actuator 20 is raised. The rear end 2b is held at the flip-up position. In FIG. 4, reference numeral 6 denotes a windshield.

FIGS. 5A and 5B are perspective views showing the hood lock mechanism 12 in FIGS. 1 and 4, wherein FIG. 5A shows the structure on the hood side, and FIG. 5B shows the structure on the vehicle body side. As shown in FIG. 5, the hood lock mechanism 12 includes a hood side lock fitting 31 and a vehicle body side lock fitting 32, and the lock by the vehicle body side lock fitting 32 is released by a wire operation from the vehicle interior, and the release is performed. The hood 2 can be opened and closed by manually operating the safety lock lever 33 in the state in which the hood 2 is operated. In FIG. 5, reference numeral 7 indicates an engine room.

Here, the hinge mechanism 11 will be described. 6 is a front view showing the periphery of the hinge mechanism 11, FIG. 7 is a plan view showing the hinge mechanism 11 in FIG. 6, and FIG. 8 is a right side view of the one shown in FIG.

As shown in FIGS. 6 to 8, the hinge mechanism 11
Has a hood side link 40, a vehicle body side link 50, and an intermediate link 60. The hood-side link 40 is arranged in parallel with the vehicle front-rear direction X and is fixed to the lower surface of the hood 2 with a bolt. A receiving portion 41 for the actuator 20 is formed at the front end of the vehicle front-rear direction X. A fulcrum pin 42 is attached to the rear end in parallel with the vehicle width direction Y.

The vehicle body side link 50 is disposed in parallel with the vehicle front and rear direction X and is fixed to the vehicle body 3 by bolts. A U-shaped engaging portion 51 is formed at the upper rear end of the vehicle front and rear direction X. The fulcrum pin 42 of the hood side link 40 is engaged with the joint portion 51. A sliding hole 52 extending from the front end to the center of the vehicle body side link 50 is penetrated, and a holding portion 53 for the intermediate link 60 recessed downward is provided at the rear end of the sliding hole 52. Is formed.

The intermediate link 60 is disposed between the hood side link 40 and the vehicle body side link 50, and a sliding pin 61 implanted at one end is slidably inserted into a sliding hole 52 of the vehicle body side link 50. The other end is rotatably attached to the fulcrum pin 42. The fulcrum pin 42 is provided with a flange portion 42a for preventing the other end of the intermediate link 60 from shifting in the axial direction.

A support pin 54 is attached below the engaging portion 51 of the vehicle body side link 50 in parallel with the vehicle width direction Y, and an intermediate portion of a lock piece 70 is rotatably attached to the support pin 54. ing.

The lock piece 70 has a lock portion 71 formed at an upper portion thereof for rotatably locking the fulcrum pin 42 in cooperation with the engagement portion 51 of the vehicle body side link 50, and a lock portion 71 at a lower portion thereof. Spring 72 for pressing against fulcrum pin 42
One end is attached. The other end of the spring 72 is attached to the front end of the vehicle body-side link 50, and pulls the lower portion of the lock piece 70 forward in the vehicle front-rear direction X.

FIGS. 9 and 10 are explanatory diagrams of the operation of the hinge mechanism 11. FIG. In the hinge mechanism 11 described above, in normal times, when the lock of the hood lock mechanism 12 is manually released and the tip of the hood 2 is lifted to check the engine room 7, etc., as shown in FIG. 2 rotates clockwise W around the fulcrum pin 42 of the hinge mechanism 11 as a rotation center, and the tip 2a is lifted. Conversely, when the hood 2 is closed, by lowering the tip 2a of the hood 2, the hood 2 rotates counterclockwise CW about the fulcrum pin 42 of the hinge mechanism 11 as a rotation center, and the hood lock mechanism 12 Locked to 3.

When the front end of the vehicle 1 collides with an obstacle during traveling, as shown in FIG.
0 is actuated, the push-up rod 21 as a push-up member of the actuator 20 rises, and the rising force of the push-up rod 21 overcomes the repulsive force of the spring 72, and the engaging portion 51 of the vehicle body side link 50 and the lock piece 70 lock part 71
The lock of the fulcrum pin 42 is released by the cooperation of the above and the rear end 2b of the hood 2 is flipped up.

At this time, the intermediate link 60 is
1 along the sliding hole 52 of the vehicle body side link 50
, The sliding pin 61 is held by the holding portion 53, and the rear end 2b of the hood 2 is held at the flip-up position.

Accordingly, the engaging portions 51 of the vehicle body side link 50,
The support pin 54, the lock piece 70, and the spring 72 lock the fulcrum pin 42 provided on the vehicle body side link 50 so as to be rotatable, restrain the rear end 2b of the hood 2 at a fixed position on the vehicle body 3 side, and open and close the hood 2. Support the actuator 20
Constitutes a fulcrum pin lock mechanism 80 in which the lock is released with the operation of.

It should be noted that the intermediate link 60 causes the obstacle colliding with the front end of the vehicle 1 to fall onto the hood 2 and
When a secondary collision occurs, the collision energy is absorbed by deformation, so that it is formed in a plate shape that is easily deformed in a secondary collision.

FIG. 11 is a sectional view showing the actuator 20. As shown in FIG.
Includes a push-up rod 21, a housing 22, and an inflator 23.

The push-up rod 21 has a hemispherical upper end 21a formed at the upper end, a piston 21b formed at the lower end, and an upper end 21a and a piston 21b having a smaller diameter than the upper end 21a and the piston 21b. The connecting portion 21c includes a cylindrical connecting portion 21c.
The front of the vehicle in the vehicle front-rear direction X at a position closer to 1b serves as a deformation starting point when a load exceeding a set load is applied due to a secondary collision between the obstacle and the hood 2, and the actuator 20
The groove 21d is formed as a holding release mechanism for releasing the holding of the hood 2 by the above.

The housing 22 is provided with a bottomed cylindrical cylinder portion 22a in which the piston portion 21b of the push-up rod 21 is slidably fitted, and a mounting portion 22b for mounting the vehicle body 3. Then, the connecting portion 21c of the push-up rod 21
Cylinder portion 22a having an inner diameter slightly larger than the outer diameter of
From the opening at the upper end, the upper end 21 of the push-up rod 21
a and a part of the connecting portion 21c protrude.

The inflator 23 is provided with a gas generating agent 23 filled in the cylinder portion 22a between the bottom portion 22c of the cylinder portion 22a and the piston portion 21b of the push-up rod 21.
a and an igniter 23b for igniting an igniter in the gas generating agent 23a, and the igniter 23b is attached to a peripheral wall of the cylinder portion 22a near the bottom wall 22c. The controller 1 is connected to the ignition device 23b.
An electric wire 24 for transmitting a signal from the control unit 5 is wired.

In the actuator 20 described above, when the collision detecting means 16 detects a collision between the front end of the vehicle 1 and an obstacle, a detection signal is transmitted to the ignition device 23b, and the ignition device 23b is activated. As a result, the igniting agent in the gas generating agent 23a is ignited, and a gas such as nitrogen gas is generated from the gas generating agent 23a at a stretch and expands, and the push-up rod 21 rises at a stretch.

FIGS. 12 and 13 are operation explanatory views showing the operation of the first embodiment. FIG. 12 shows a state immediately before a second collision of an obstacle with the hood, and FIG. This shows a state immediately after a secondary collision with the hood.

In the first embodiment of the present invention described above,
When the front end of the vehicle 1 collides with an obstacle, the push-up rod 21 of the actuator 20 rises at a stretch as shown in FIG.
b is released at the fixed position on the vehicle body 3 side, the rear end 2b of the hood 2 is flipped up from the vehicle body 3, and the rear end 2b of the hood 2 is held at the flipped position together with the intermediate link 60 of the hinge mechanism 11. .

At this time, the obstacle G that has primarily collided with the front end of the vehicle 1 has a speed close to the vehicle speed V at the time of the primary collision, and enters the hood 2 at an approach angle θ. For example, the obstacle G in the case of a primary collision with the automobile 1 running at a vehicle speed of 40 km / h has a rush speed of 41 k into the hood 2.
m / h, the entry angle to the hood 2 is 61 degrees.

As shown in FIG. 12, when the push-up rod 21 holds the rear end 2b of the hood 2 at the flip-up position, the recess 21d is formed on the push-up rod 21 of the actuator 20 in a position where the recess 21d is formed. Are set to slightly protrude from inside the housing 22 of the actuator 20.

When the obstacle G colliding with the front end of the vehicle 1 collides with the hood 2 with a load exceeding the set load, the obstacle G in FIG.
As shown in FIG. 3, the hood 2 is deformed by dent at the collision site,
The push-up rod 21 of the actuator 20 has a groove 21
The intermediate link 60 of the hinge mechanism 11 is also deformed by the deformation starting from d, and the collision energy of the secondary collision is absorbed by the deformation of the hood 2, the push-up rod 21 and the intermediate link 60 by the amount of the deformation.

In the first embodiment described above, the vehicle 1
When the actuator 20 is actuated by the front end of the actuator 20 colliding with the obstacle G, the intermediate link 60 of the hinge mechanism 11 stands up and holds the rear end 2b of the hood 2 at the flip-up position. Food 2
Of the rear end 2b can be reliably stopped at the flip-up position.

In the first embodiment, when the obstacle G colliding with the front end portion of the vehicle 1 collides with the hood 2 with a load exceeding the set load, the hood 2 and the push-up rod 21
24 and the deformation of the intermediate link 60, the collision energy of the secondary collision is absorbed by the deformation, so that the intermediate link 60 and the push-up rod 2 are different from the conventional product shown in FIG.
More collision energy of the secondary collision can be absorbed by one deformation, and the impact of the obstacle G at the time of the secondary collision can be further reduced.

In the first embodiment, the actuator 20 that raises the push-up rod 21 by activating the ignition device 23b of the inflator 23 by an electric signal is described. However, the actuator is not limited to the inflator type. Of course, the actuator may be of a hydraulic type having a hydraulic pressure source and releasing the hydraulic pressure stored in the accumulator by an electromagnetic valve to raise the push-up rod. .

(Second Embodiment) FIGS. 14 to 16 show a second embodiment which is an example of an embodiment in which the inventions of claims 1 to 4 and 6 are implemented together. In the following description of the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description overlapping with the description of the first embodiment will be omitted.

As shown in FIGS. 14 and 15, in the second embodiment, the push-up rod 121 of the actuator 120 is used.
Is actively used as an energy absorbing material at the time of a secondary collision with the obstacle G, the connecting portion 1 of the push-up rod 121 is used.
21c is hollow, and a plurality of concave grooves 121d are provided in the connecting portion 121c along the pushing direction of the push-up rod 121, and the concave groove 121 is formed around the entire circumferential direction of the connecting portion 121c of the push-up rod 121. Formed.

In this way, the push-up rod 12
1 was designed such that its buckling load was, for example, 1000 kg. Since the load for flipping the rear end 2b of the hood 2 is about 150, when the rear end 2b of the hood 2 is flipped up, the push-up rod 121 of the actuator 120 is required.
Does not buckle or deform.

In the above-described second embodiment, as shown in FIG. 16, when the obstacle G colliding with the front end of the vehicle 1 secondary collisions with the hood 2 with a load exceeding the set load, the first
As in the embodiment, the collision portion of the hood 2 is deformed by being depressed by the collision energy of the secondary collision, the push-up rod 121 of the actuator 120 is deformed starting from the groove 121d, and the intermediate link 60 of the hinge mechanism 11 is also deformed. The collision energy of the secondary collision is the hood 2, the push-up rod 12
1 and the deformation of the intermediate link 60 are absorbed by the deformation.

Further, in the second embodiment, the connecting portion 121c of the push-up rod 121 is provided with a plurality of concave grooves 121d along the push-up direction of the push-up rod 121.
Even if the obstacle G collides with the hood 2 in the middle of the bouncing motion of the hood 2, the recessed groove 1
The push-up rod 121 can be deformed starting from the point 21d, and the deformation can absorb the collision energy of the secondary collision and reduce the impact of the obstacle G at the time of the secondary collision.

In addition, in the second embodiment, since the groove 121d is formed over the entire circumference of the connecting portion 121c of the push-up rod 121 in the circumferential direction, the obstacle G can be moved with respect to the hood 2 at the time of the secondary collision. Regardless of the direction in which the hood 2 falls down, the collision energy of the secondary collision can deform the push-up rod 121 starting from the concave groove portion 121d. The deformation absorbs the collision energy of the secondary collision, and The impact of the obstacle G at the time can be reduced.

Therefore, in the second embodiment, the collision energy can be more reliably absorbed at the time of the secondary collision of the obstacle G with the hood 2 as compared with the first embodiment, and the collision energy absorption can be performed. Can be improved in reliability.

(Third Embodiment) FIGS. 17 to 20 show a third embodiment which is an example of an embodiment in which the inventions according to claims 1 to 5 are implemented together. In the following description of the third embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description that is the same as that of the first embodiment will be omitted.

In the third embodiment, as shown in FIG.
The holding portion 153 for holding the standing intermediate link 60 is mounted on the vehicle body side link 150 of the hinge mechanism 110 in accordance with the flip-up position of the hood rear end 2b, that is, the sliding hole 152 of the vehicle body side link 150 is slid. Three positions are provided along the sliding direction of the sliding pin 61 of the moving intermediate link 60.

In the third embodiment, as shown in FIG. 18, the connecting portion 221c of the push-up rod 221 of the actuator 220 is also provided in accordance with the position at which the rear end 2b of the hood is raised, that is, the push-up rod 221 is pushed up. A groove 2 serving as a starting point of deformation when a load exceeding a set load is applied in a secondary collision between the obstacle and the hood 2 along the direction.
21d are provided in three places.

As shown in FIG. 19, for example, when the intermediate link 60 is held by the second holding portion 153 of the vehicle body side link 150,
The vehicle body side link 1 is formed such that the second concave groove portion 221d slightly protrudes from the inside of the housing 22 of the actuator 220 and becomes a deformation starting point of the push-up rod 221 at the time of a secondary collision.
The respective holding portions 153 of the 50 and the respective groove portions 221d of the push-up rod 221 are provided so as to correspond to each other.

In the third embodiment described above, the vehicle body side link 150 of the hinge mechanism 110 is provided with three holding portions 153 for holding the standing intermediate link 60.
As shown in FIG. 9, the push-up rod 221 can hold the hood 2 together with the intermediate link 60 even while the hood rear end 2 b is being pushed up from the vehicle body 3 by the push-up rod 221.

Further, in the third embodiment, each holding portion 153 of the vehicle body side link 150 and each groove portion 221d of the push-up rod 221 are disposed in correspondence with each other.
0, the obstacle G colliding with the front end of the car 1
Collides with the hood 2 with a load exceeding the set load,
Even if the secondary collision is in the process of jumping up the hood rear end 2b by the push-up rod 221 of the actuator 220, the push-up rod 221 is broken by the deformation starting from the concave groove 221d, and the hood 2 and the intermediate link 6 are deformed.
Together with 0, it absorbs the collision energy of the secondary collision.

The obstacle G may collide with the hood 2 while the rear end 2b of the hood is being pushed up from the vehicle body 3 by the push-up rod 221. A case where the speed is high, a case where snow or the like falls on the hood 2 and the like can be considered.

Because the arrival time of the rear end 2b of the hood to reach the flip-up position is set under the condition that the vehicle 1 collides with the obstacle G at a speed equivalent to the running in the city, the arrival time is equivalent to the running in the city. If the vehicle 1 collides with the obstacle G at a speed higher than the speed, the obstacle G will collide with the hood 2 before the rear end 2b of the hood reaches the flip-up position.

When snow or the like falls on the hood 2, the weight of the snow or the like is added to the weight of the hood 2.
The jumping speed of the hood 2 becomes slow, and the hood rear end 2b
This is because the obstacle G secondarily collides with the hood 2 before reaching the flip-up position.

(Fourth Embodiment) FIG.
It is explanatory drawing which shows 4th Embodiment which is an example of embodiment which combined and implemented each invention as described in 7 and 7, (a) is a state at the time of normal, (b) is a state at the time of hood jumping up. Is shown. In the following description of the fourth embodiment, the same components as those of the first embodiment will be denoted by the same reference numerals, and description that is the same as that of the first embodiment will be omitted.

As shown in FIG. 21A, in the fourth embodiment, the piston 321 of the push-up rod 321 in the normal state in the cylinder 322 of the actuator 320 is used.
b, an exhaust hole 323 having a minute hole diameter is provided at a contact portion with the b.
The exhaust hole 323 is closed with a sealing plug 324, and a bracket 32
5 and its bracket 325 and sealing plug 324
And were connected by a wire 326.

Then, as shown in FIG. 21 (b), immediately before the push-up rod 321 of the actuator 320 completes ascending and holds the hood rear end 2b at the flip-up position,
The wire 326 extends completely and the sealing plug 324 is removed from the exhaust hole 324.
The length of the wire 326 is selected so as to remove the wire 326 from the wire 326.

Further, in the fourth embodiment, when the obstacle G colliding with the front end of the automobile 1 falls on the hood 2 and secondary collision with the hood 2 with a load exceeding the set load, the push-up rod of the actuator 320 is used. The diameter of the exhaust hole 323 is selected so that the hood 321 descends at a predetermined speed and the holding of the hood rear end 2b by the push-up rod 321 is released.

For this reason, in the fourth embodiment, when the collision detecting means 16 detects a collision between the front end of the vehicle 1 and the obstacle G, the ignition device 23b of the actuator 320 based on the detection signal activates the gas generating agent. The igniting agent in the gas generating agent 23a is ignited, and the ignition generates a gas such as nitrogen gas from the gas generating agent 23a at once, and expands.
The high-pressure gas 327 as a pressure fluid generated from 3a raises the push-up rod 321 of the actuator 320 at once, and jumps up the rear end 2b of the hood 2 from the vehicle body 3,
The rear end 2b of the hood 2 is held at the flip-up position by the push-up rod 321 of the actuator 320 and the intermediate link 60 of the hinge mechanism 11.

At this time, since the wire 326 removes the sealing plug 324 from the exhaust hole 323, the cylinder portion 322 of the actuator 320 as a pressure accumulating portion for the high-pressure gas 327 holding the rear end 2b of the hood 2 at the flipped position is provided. The inside communicates with the outside via the exhaust hole 323.

Therefore, in the fourth embodiment, the obstacle G falls on the hood 2 and the hood 2
Secondary collision, the internal pressure of the cylinder portion 322 rises via the push-up rod 321 of the actuator 320,
By this pressure increase, the high-pressure gas 327 in the cylinder portion 322 is pushed out from the exhaust hole 324, and the push-up rod 321 is pushed.
Descends at a predetermined speed, the lifting rod 321 releases the hood rear end 2b, and absorbs the energy of the secondary collision.

Therefore, in the fourth embodiment, the wire 32
6, the exhaust hole 323 and the sealing plug 324 constitute a pressure reducing mechanism 330 for reducing the pressure of the cylinder part 322 as a pressure accumulating part at the time of the secondary collision.
30 functions as a holding release mechanism for releasing the holding of the hood rear end 2b by the actuator 320 at the time of a secondary collision.

In the fourth embodiment described above, the obstacle G
24 can absorb not only the deformation of the hood 2 and the intermediate link 60 but also the collision energy at the time of the secondary collision with the hood 2. 32
The collision energy of the secondary collision can be further absorbed by the amount absorbed by 0, and as a result, the impact of the obstacle at the time of the secondary collision can be further reduced.

In the fourth embodiment, the wire 32
6, the exhaust hole 323 and the sealing plug 324 constitute a pressure reducing mechanism 330. However, if instead of the wire 326, the exhaust hole 323, and the sealing plug 324, a relief valve for preventing a pressure increase above a set pressure is attached to the cylinder portion 322 of the actuator 320, the obstacle G may be connected to the hood 2 with a load exceeding the set load. In the case of a secondary collision, the pressure in the cylinder portion 322 is released by a relief valve to absorb the collision energy of the secondary collision and reduce the impact of the obstacle at the time of the secondary collision, as in the fourth embodiment. can do.

In the fourth embodiment, an example in which the high-pressure gas 327 is used as the pressure fluid has been described.
The pressure is not limited to high-pressure gas 327 such as nitrogen gas or air. For example, oil that releases a hydraulic pressure stored in an accumulator as a pressure accumulating unit by an electromagnetic valve and raises a push-up rod may be used.

In the fourth embodiment, an example in which the push-up rod 321 is provided as the actuator 320 has been described. However, the actuator is not limited to the one having the push-up rod, and may be, for example, an airbag. .

(Fifth Embodiment) FIGS. 22 and 23 show a fifth embodiment according to the ninth embodiment of the present invention.
1 shows an embodiment. In the following description of the fifth embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and a description that is the same as that of the first embodiment will be omitted.

As shown in FIGS. 22 and 23, in the fifth embodiment, an actuator 20 is provided in an air box 90 communicating with the outside air, and the actuator 2 in the hood 2 is provided.
A receiving portion 91 for the actuator 20 is provided at a position located above the zero.

The air box 90 is surrounded by a dash upper panel 92, and a gap between the dash upper panel 92 and the hood 2 is closed by a partition member 93 such as rubber or urethane, and is isolated from the engine room 7. In addition, since it communicates with the outside air, the temperature fluctuation is small and the temperature during running of the automobile 1 is low compared to the engine room 7.

In FIG. 23, reference numeral 94 denotes a dash lower panel that separates the engine room 7 from the cabin, and reference numeral 95 denotes a part of the wiper.

In the fifth embodiment, the air box 90
Since the actuator 20 is provided in the inside, the actuator 20 is maintained in the air box 90 in which the temperature fluctuation is small compared to the engine room 7 and the temperature during driving of the automobile 1 is low,
Can be activated.

Therefore, the fifth embodiment is suitable for the case where a driving source which dislikes high temperature such as explosive is used as a driving source of the actuator 20, and the adverse effect on the actuator 20 due to temperature is reduced as compared with the first embodiment. And the reliability of the system is improved.

The actuators 120, 220, and 320 are replaced with the air box 90 instead of the actuator 20.
By arranging them inside, the influence on the actuator 20 due to the temperature is reduced as compared with the second to fifth embodiments, and the reliability of the system is of course improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an automobile including a flip-up hood according to a first embodiment.

FIG. 2 is a block diagram of what is shown in FIG.

FIG. 3 is a flowchart executed by a controller in FIG. 2;

FIGS. 4A and 4B are explanatory diagrams of what is shown in FIG. 1, wherein FIG. 4A shows a state when the hood is closed, FIG.
(C) shows a state when the hood is flipped up.

FIGS. 5A and 5B are perspective views showing a hood lock mechanism in FIG. 1, wherein FIG. 5A shows a hood side structure, and FIG. 5B shows a vehicle body side structure.

FIG. 6 is a front view showing the periphery of a hinge mechanism in FIG. 1;

FIG. 7 is a plan view showing a hinge mechanism in FIG. 6;

FIG. 8 is a right side view of the device shown in FIG.

FIG. 9 is an operation explanatory view showing a state when the hood is released in the state shown in FIG. 6;

FIG. 10 is an operation explanatory view showing a state when the hood is flipped up as shown in FIG. 6;

FIG. 11 is a sectional view showing the actuator in FIG. 10;

FIG. 12 is an operation explanatory diagram showing a state immediately before a secondary collision of the vehicle shown in FIG. 10;

FIG. 13 is an operation explanatory view showing a state immediately after a secondary collision of the one shown in FIG. 10;

FIG. 14 is a sectional view showing a second embodiment.

FIG. 15 is an enlarged view of a main part of what is shown in FIG.

FIG. 16 is an operation explanatory view of what is shown in FIG. 14;

FIG. 17 is an explanatory diagram showing a third embodiment.

FIG. 18 is a sectional view showing the actuator shown in FIG. 17;

FIG. 19 is an operation explanatory view showing a state when the hood is flipped up as shown in FIG. 17;

FIG. 20 is an operation explanatory view showing a state immediately after the secondary collision of the state shown in FIG. 19;

FIG. 21 is an explanatory view showing the fourth embodiment, in which (a)
Shows a state at the time of normal operation, and (b) shows a state at the time of lifting the hood.

FIG. 22 is an explanatory diagram showing a fifth embodiment.

FIG. 23 is an enlarged view of a portion Z shown in FIG. 22;

FIG. 24 is an explanatory view showing an example of a conventional product.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Automobile (vehicle) 2 Hood 2a Front end of hood 2b Rear end of hood 3 Body 7 Engine room 11 Hinge mechanism 12 Hood lock mechanism 16 Collision detection means 20, 120, 220, 320 Actuator (bounce means) 21, 121, 221 , 321 Thrust rod (thrust member) 21d, 121d, 221d Depressed groove (holding release mechanism) 22a, 322 Cylinder (pressure accumulating part) 40 Hood side link 42 Support pin 50, 150 Body side link 53, 153 Holding part 60 Intermediate link 80 fulcrum pin lock mechanism 90 air box 327 high pressure gas (pressure fluid) 330 pressure drop mechanism (holding release mechanism) G obstacle

Claims (9)

[Claims] A hood provided at a front portion of the vehicle, a hinge mechanism for restraining a rear portion of the hood toward a vehicle body to support the hood so that the hood can be opened and closed, and the restraint being released by a flip-up force; A hood lock mechanism for locking the front end of the hood to the vehicle body with the hood closed; collision detection means for detecting a collision between the front portion of the vehicle and an obstacle; and a hood lock mechanism based on a detection signal from the collision detection means. A flip-up hood provided with a flip-up means for applying the flip-up force to a rear portion and flipping and holding the rear end of the hood from the vehicle body, wherein the load exceeds a set load on the hood when the flip-up means is operated. A flip-up hood comprising a holding release mechanism for releasing the holding of the hood by the flip-up means when a load is applied. 2. The flip-up hood according to claim 1, wherein the hinge mechanism includes: a hood-side link provided at a rear portion of the hood; a body-side link provided to the vehicle body; One end is slidably connected to the link, and the other end is rotatably connected to the hood-side link via a fulcrum pin. An intermediate link held on the vehicle body side link, the fulcrum pin is rotatably locked to restrain the rear portion of the hood on the vehicle body side and to support the hood so that the hood can be opened and closed. A flip-up hood comprising a fulcrum pin lock mechanism for releasing the lock. 3. The flip-up hood according to claim 2, wherein the flip-up means includes a push-up member that flips up and holds a rear end of the hood from a vehicle body, and the holding release mechanism includes the push-up mechanism. A flip-up hood provided on a member, which is a concave groove serving as a deformation starting point of the push-up member. 4. The flip-up hood according to claim 3, wherein a plurality of the concave grooves are provided in a direction in which the push-up member pushes up. 5. The flip-up hood according to claim 4, wherein a plurality of holding portions for holding the standing intermediate link are provided on the vehicle body side link in accordance with a flip-up position of a rear end of the hood. A flip-up hood, wherein each groove of the push-up member is disposed in correspondence with each of the holding portions in accordance with a flip-up position of the rear end of the hood. 6. The flip-up hood according to claim 3, wherein the groove is formed over the entire circumference of the push-up member in the circumferential direction. Lifting hood. 7. The pressure-accumulating portion of the pressurized fluid according to claim 1, wherein the jumping-up means holds a rear end of the hood, which is jumped up by a pressurized fluid, at a jumped-up position. Wherein the holding release mechanism is a pressure reducing mechanism provided in the pressure accumulating section to reduce the pressure of the pressure accumulating section. 8. The flip-up hood according to claim 7, wherein the pressure reducing mechanism is a relief valve for preventing a pressure increase above a set pressure of the pressure accumulating unit. 9. The flip-up hood according to claim 1, wherein the flip-up means is provided in an air box on a vehicle body side which is cut off from an engine room and communicates with outside air. And flip-up hood.