JP2018103845A - Vehicle hood structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit vertical vibration of a hood rear end part provided with an airbag during traveling.SOLUTION: An airbag 40 which inflates and expands so as to cover at least a cowl 30 provided at the vehicle fore and aft direction rear side of a hood rear end part 20B when a vehicle 12 predicts or detects a collision with an object is provided at the hood rear end part 20B of a hood 20 covering a power unit room 14 at a front part of the vehicle 12. A hood lock mechanism 80 which locks the other vehicle fore and aft direction end side of a hinge base 52 to a hinge arm 54 is provided at a hood hinge 50 which connects the food rear end part 20B to a vehicle body so that the hood rear end part 20B can rotate in a vehicle vertical direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle hood structure.

  Patent Document 1 discloses that when a vehicle collides with an object existing outside the vehicle or when a collision with the object is detected, at least a part of the cowl is covered with an inflating gas ejected from an inflator. A technique related to an air bag device for an outside vehicle in which a bag is inflated and deployed is disclosed (see Patent Document 1).

  Thus, an airbag that inflates and deploys so as to cover at least a part of the cowl may be provided at the rear end of the hood. When an airbag is mounted on the rear end of the hood, the weight increases and the natural frequency of the hood decreases. When the natural frequency of the hood decreases, the hood approaches the unsprung resonance frequency, and the hood may vibrate greatly when the vehicle is running.

  Other related techniques are disclosed in Patent Document 2 and Patent Document 3.

JP 2007-112183 A JP-A-2015-140112 JP H01-15987

  An object of the present invention is to suppress the vibration in the vehicle vertical direction when the rear end of the hood provided with the airbag is traveling in consideration of the above fact.

  The invention according to claim 1 is provided at a hood that covers a power unit room at a front portion of a vehicle and a hood rear end portion of the hood, and the hood rear end portion when the vehicle predicts or detects a collision with an object. An airbag that inflates and deploys so as to cover at least a part of a cowl provided on the rear side in the vehicle front-rear direction, a hood lock mechanism that locks the front end of the hood to the vehicle body, and unlocking by the hood lock mechanism A hood lock release mechanism, a hinge base provided on the vehicle body, and a hinge arm provided at a rear end of the hood and rotatably connected to one end side of the hinge base in the vehicle front-rear direction. A hood hinge configured to connect the rear end of the hood to the vehicle body so as to be rotatable in a vehicle vertical direction; A hinge lock mechanism that locks the other end side in the front-rear direction to the hinge arm, and a hinge lock release mechanism that unlocks the hinge lock mechanism in conjunction with unlocking the hood front end by the hood lock release mechanism; It is the hood for vehicles provided with.

  According to the first aspect of the present invention, a part of the cowl provided at the rear side in the vehicle front-rear direction of the rear end of the hood when the vehicle predicts or detects a collision with the object at the rear end of the hood. There is provided an airbag that inflates and deploys so as to cover at least. As the weight is increased by providing the airbag at the rear end of the hood, the natural frequency of the hood decreases and approaches the unsprung resonance frequency of the vehicle. Therefore, when the vehicle travels, the vehicle body displacement is caused by resonance with the displacement of the vehicle body as the excitation source, and the rear end of the hood is rotationally displaced about one end side in the vehicle front-rear direction where the hinge arm is rotatably connected. It becomes easy to vibrate.

  However, since the other end side of the hinge base in the vehicle front-rear direction is locked to the hinge arm by the hinge lock mechanism, the rotational displacement about the one end side of the hinge arm in the vehicle front-rear direction is suppressed. The vibration in the vehicle vertical direction at the end is suppressed.

  According to the first aspect of the present invention, it is possible to suppress the vibration in the vehicle vertical direction when the rear end of the hood provided with the airbag is running.

It is sectional drawing which shows typically the cross section along the vehicle front-back direction of the front part of the vehicle to which the vehicle hood structure which concerns on one Embodiment of this invention was applied. 1 is a plan view schematically showing a front portion of a vehicle to which a vehicle hood structure according to an embodiment of the present invention is applied. FIG. 3 is a cross-sectional view schematically showing a cross section taken along line 3-3 in FIG. 2. It is sectional drawing which shows typically the cross section along the vehicle front-back direction of the side part of the vehicle front part to which the vehicle hood structure which concerns on one Embodiment of this invention was applied. It is a side view which shows typically the side which looked at the hood hinge from the vehicle width direction outside. FIG. 6 is a side view corresponding to FIG. 5 with the hood open. It is a top view which shows typically the plane which looked at the hood hinge from the vehicle up-down direction upper side. FIG. 8 is a cross-sectional view schematically showing a cross section taken along line 8-8 in FIG. 7. It is explanatory drawing which showed in order from (A) to (C) the process in which a hood lock pin inserts and locks in the lock hole of the bracket of a hood lock mechanism by closing a hood. It is a graph which shows the natural frequency of a hood, and a vehicle unsprung resonance frequency. It is a side view corresponding to FIG. 5 explaining the vibration of the vehicle up-down direction of the hood rear end part of the comparative example to which the present invention is not applied.

  A vehicle hood structure according to an embodiment of the present invention will be described with reference to FIGS. It should be noted that an arrow FR, an arrow UP, and an arrow OUT that are appropriately described in the drawings respectively indicate the vehicle front-rear direction front side, the vehicle vertical direction upper side, and the vehicle width direction outer side. Further, each direction of the hood 20 described later will be described as a direction in a closed state unless otherwise specified.

<Structure>
First, the structure of the main part of the vehicle to which the vehicle hood structure 10 according to this embodiment is applied will be described.

  As shown in FIG. 1, a hood 20 that covers the power unit room 14 is provided above the power unit room 14 at the front portion of the vehicle 12 to which the vehicle hood structure 10 according to the present embodiment is applied. The hood 20 is composed of a hood outer panel 22 and a hood inner panel 24, and the terminal portions of both are joined by hemming. 1 is in a closed state in which the power unit room 14 is closed.

  A front windshield glass 16 is disposed on the rear side in the vehicle front-rear direction of the hood rear end 20B. A cowl 30 is provided on the front side in the vehicle front-rear direction and the vehicle vertical direction lower side of the lower end portion 16A of the front windshield glass 16. The cowl 30 is provided to extend downward in the vehicle front-rear direction of the hood rear end 20B of the hood 20. The upper end 32 of the cowl 30 on the rear side in the vehicle front-rear direction extends in the vehicle width direction along the lower end 16 A of the front windshield glass 16.

  As shown in FIGS. 2 and 3, an airbag 40 extending in the vehicle width direction is provided below the hood rear end 20 </ b> B of the hood 20. The airbag 40 is connected to an inflator not shown, and the inflator is connected to a controller (airbag ECU) not shown. A controller (not shown) is connected to a collision detection sensor (not shown) or a collision prediction sensor (not shown) arranged at the front end of the vehicle 12 or the like.

  As the collision detection sensor, for example, a chamber method or an optical fiber method in which a long pressure tube or a pressure chamber and a pressure sensor are arranged along the front bumper on the front side of the front bumper reinforcement is applicable. . As the collision prediction sensor, for example, a pre-crash sensor that predicts a collision with a collision object such as a pedestrian using a millimeter wave radar or a stereo camera can be applied.

  When a collision detection sensor (not shown) detects a collision with an object such as a pedestrian, or when a collision prediction sensor (not shown) predicts a collision with an object such as a pedestrian, The inflator is activated by the controller that does not, and the airbag 40 is inflated and deployed so as to cover at least a part of the cowl 30 from between the hood rear end 20B and the front windshield glass.

  That is, when the vehicle 12 detects or predicts a collision with an object such as a pedestrian, the airbag 40 provided at the hood rear end 20B of the hood 20 is inflated and deployed so as to cover at least the cowl 30.

  As shown in FIG. 2, the hood rear end portion 20B of the hood 20 is coupled to the vehicle body so as to be rotatable in the vertical direction by hood hinges 50 disposed on the left and right sides outside the vehicle width direction. The left and right hood hinges 50 have the same structure except that they are symmetric, and will be described without distinction.

  As shown in FIGS. 2, 4, and 5, the hood hinge 50 includes a hinge base 52 that is fixed to the vehicle body, and a hinge arm 54 that is provided at the rear end portion 20 </ b> B of the hood and is rotatably connected to the hinge base 52. , Including.

  As shown in FIGS. 4 and 5, the hinge base 52 has a substantially L shape when viewed from the side in the vehicle width direction. And the protrusion part 52C which protruded to the upper side formed in the rear-end part 52A of the vehicle front-back direction of the hinge base 52 rotates to the rear-end part 54A of the vehicle front-back direction of the hinge arm 54 by the hinge pin 55 (refer also FIG. 7). Connected as possible.

  As shown in FIGS. 5 and 7, a hinge locking mechanism 60 that locks the hinge arm 54 to the hinge base 52 is provided on the front side of the hood hinge 50 in the vehicle front-rear direction.

  As shown in FIGS. 5, 7, and 8, the hinge lock mechanism 60 includes a bracket 62 and a lock pin 64. The bracket 62 is fixed to the front end portion 54B of the hinge arm 54 in the vehicle front-rear direction, extends downward in the vehicle vertical direction, and the front end portion 62A overlaps the vehicle front-rear direction front end portion 52B of the hinge base 52 in the vehicle width direction. ing.

  The lock pin 64 is provided in the front end portion 52B of the hinge base 52 with the vehicle width direction as an axial direction, and is inserted into a lock hole 63 (see FIGS. 6, 7 and 8) formed in the distal end portion 62A of the bracket 62. As a result, the hinge arm 54 (the bracket 62 provided on the hinge arm 54) is locked to the hinge base 52. The lock pin 64 is biased by the coil spring 66 toward the inside in the vehicle width direction, which is the insertion direction.

  As shown in FIGS. 4 and 8, the hinge lock mechanism 60 is unlocked by a hinge lock release mechanism 70. A hinge cable 72 of a hinge lock releasing mechanism 70 is connected to the lock pin 64. When the hinge cable 72 is pulled, the lock pin 64 is removed from the lock hole 63 of the bracket 62, and the lock is released. ing.

  As shown in FIG. 4, the hood front end 20 </ b> A of the hood 20 is locked to the vehicle body by the hood lock mechanism 80, and is fixed to the vehicle body in the closed state. Further, the lock is released by the hood lock release mechanism 82.

  The hood lock release mechanism 82 includes a hood lock cable 84 and an opener lever 86. When the opener lever 86 is pulled (see the opener lever 86 on the phantom line (dashed line) in the figure), the hood lock release mechanism 82 is connected to the opener lever 86. The hood lock cable 84 is pulled and the hood lock mechanism 80 is unlocked.

  Further, the hinge cable 72 of the hinge lock release mechanism 70 described above is also connected to the opener lever 86, and when the opener lever 86 is pulled, the hinge cable 72 is also pulled and the lock of the hinge lock mechanism 60 is released. ing.

  That is, the lock of the hinge lock mechanism 60 of the hood hinge 50 is released in conjunction with the unlocking of the hood lock mechanism 80 that locks the hood front end 20A of the hood 20.

  Then, by releasing the lock of the hood lock mechanism 80 and the lock of the hinge lock mechanism 60, as shown in FIG. 6, the hood 20 rotates the hinge pin 55 of the hood hinge 50 provided at the hood rear end 20B. As a center, it can be rotated in the vertical direction, and the power unit room 14 (see FIGS. 1 and 4) can be opened and closed. In this embodiment, when the lock is released, a hood pop-up force is applied by a hood pop-up mechanism (not shown) so that the hood front end 20A (see FIGS. 1 and 4) of the hood 20 is automatically lifted. It has become.

  In the present embodiment, when the hood 20 is closed, the hood front end 20 </ b> A of the hood 20 is locked by the hood lock mechanism 80.

  Further, in this embodiment, when the hood 20 is closed, the hood hinge 50 of the hood rear end 20B of the hood 20 is locked by the hinge lock mechanism 60. Specifically, as shown in FIG. 9A, a tip 62A of the bracket 62 is provided with an inclined portion 62B that is inclined inward in the vehicle width direction. When the hood 20 (see FIG. 1 and FIG. 4 and the like) is closed, as the bracket 62 moves downward in the vehicle vertical direction, the inclined portion 62B comes into contact with the lock pin 64, as shown in FIG. 9B. The lock pin 64 moves in the vehicle width direction. Then, as shown in FIG. 9C, when the hood 20 (see FIGS. 1 and 4 and the like) is further closed, the lock pin 64 is locked by the urging force of the coil spring 66 and the lock hole of the tip 62A of the bracket 62 is locked. Inserted into 63 and locked.

<Action and effect>
Next, the operation and effect of this embodiment will be described.

  The hood 20 is provided with an airbag 40 at the rear end 20B of the hood, and the weight increases accordingly. As shown in FIG. 10, when the weight of the hood rear end 20B increases, the natural frequency F1 of the hood rear end 20B decreases to the natural frequency F2 and approaches the vehicle unsprung resonance frequency F3.

  Here, the case where the present invention is not applied, that is, the hood 20 in which the hood hinge 50 is not provided with the hinge lock mechanism 60 will be described with reference to FIG.

  In the hood 20 of the comparative example, the natural frequency F1 of the hood rear end 20B is changed to the natural frequency F2 as the weight increases due to the provision of the airbag 40 (see FIGS. 2 and 3) on the hood rear end 20B. By decreasing and approaching the vehicle unsprung resonance frequency F3, a phenomenon may occur in which the vehicle resonates during traveling and swings greatly in the vehicle vertical direction.

  As a deformation mode at that time, the vehicle body displacement (body displacement) at the time of traveling is used as the excitation source, and rotational displacement is performed around the hinge pin 55 that rotatably connects the rear end portion 54A of the hinge arm 54. As shown by the imaginary line (dashed line), the rear end portion 20B of the hood vibrates in the vehicle vertical direction. Note that FIG. 11 illustrates the vibration of the rear end portion 20B of the hood in the vehicle vertical direction in an easy-to-understand manner, and does not actually vibrate in this way.

  On the other hand, in the present embodiment, the closed hood rear end 20 </ b> B is locked by the hinge lock mechanism 60. Therefore, even if the natural frequency F1 of the hood rear end 20B decreases to the natural frequency F2 and approaches the vehicle unsprung resonance frequency F3 as the weight increases due to the provision of the airbag 40 at the hood rear end 20B. The vibration of the hood rear end 20B as shown in FIG. 11 is suppressed.

  A hinge arm 54 is rotatably connected to a rear end portion 52A (projecting portion 52C) of the hinge base 52 in the vehicle front-rear direction, and the hinge arm 54 is locked to a front end portion 52B of the hinge base 52 in the vehicle front-rear direction. . Thus, since the position away from the rotation fulcrum in the vehicle front-rear direction is locked, rotational displacement about the rear end portion 54A of the hinge arm 54 due to resonance during traveling is effectively suppressed. That is, vibration in the vehicle vertical direction of the hood rear end 20B is effectively suppressed.

  Further, since the lock of the hinge lock mechanism 60 of the hood hinge 50 is released in conjunction with the unlocking of the hood front end 20A by pulling the opener lever 86, compared with the case where the two unlocking are not interlocked, The hood 20 can be easily opened and closed.

<Others>
The present invention is not limited to the above embodiment.

  In the above embodiment, the hinge arm 54 is rotatably connected to the rear end portion 52A (projection portion 52C) of the hinge base 52 in the vehicle front-rear direction, and the hinge arm 54 is locked to the front end portion 52B of the hinge base 52 in the vehicle front-rear direction. There was a structure. However, the hinge arm 54 may be rotatably connected to the front end portion 52B of the hinge base 52 in the vehicle front-rear direction, and the hinge arm 54 may be locked to the rear end portion 52A of the hinge base 52 in the vehicle front-rear direction. .

  Furthermore, the present invention can be implemented in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Vehicle hood structure 12 Vehicle 14 Power unit room 20 Hood 20A Hood front end 20B Hood rear end 30 Cowl 40 Air bag 50 Hood hinge 52 Hinge base 54 Hinge arm 60 Hinge lock mechanism 70 Hinge lock release mechanism 80 Hood lock mechanism 82 Hood Unlock mechanism

Claims (1)

A hood that covers the power unit room at the front of the vehicle;
Provided at the hood rear end of the hood so as to cover at least a part of the cowl provided on the rear side in the vehicle front-rear direction of the hood rear end when the vehicle predicts or detects a collision with an object. An inflatable airbag;
A hood lock mechanism for locking the hood front end of the hood to the vehicle body;
A hood lock release mechanism for releasing the lock by the hood lock mechanism;
A hinge base provided on the vehicle body, and a hinge arm provided at the rear end of the hood and rotatably connected to one end side of the hinge base in the vehicle front-rear direction. A hood hinge for connecting the rear end of the hood to the vehicle body;
A hinge locking mechanism that is provided on the hood hinge and locks the other end of the hinge base in the vehicle longitudinal direction to the hinge arm;
A hinge unlock mechanism that unlocks the hinge lock mechanism in conjunction with unlocking the front end of the hood by the hood lock release mechanism;
Vehicle hood structure with