JP2009179266A - Hood flip-up device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hood flip-up device capable of consistently absorbing the dynamic energy of a pedestrian by allowing the plastic deformation of an actuator itself. <P>SOLUTION: The hood flip-up device U is constituted of the actuator 18 arranged below a rear end 10c of a hood panel 10, and raises a rear end 10c of a hood panel 10 while an upper end 34a of a rising piston rod 34 is abutted thereon during the operation. The piston rod 34 is subjected to the bending plastic deformation when the hood panel 10 receives a pedestrian. A receiving seat 47 for allowing an upper end 34a of a rising piston rod 34 to abut thereon is formed on a lower surface side of the hood panel rear end 10c side. The receiving seat 47 has a regulating wall 50 which extends from a front edge side of a receiving face 48 for receiving the upper end 34a of the piston rod to regulate the forward movement of the upper end 34a of the piston rod during the plastic deformation of the piston rod 34. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hood flip-up device used when a pedestrian is received by a hood panel with a rear end lifted when the pedestrian is in contact with a vehicle.

Conventionally, as a hood flip-up device, an actuator that moves upward during operation is arranged below the rear end of the hood panel, and the rear end of the hood panel is pushed up by this actuator to raise the hood panel. (For example, see Patent Document 1). This conventional hood flip-up device is configured to absorb the kinetic energy of the pedestrian by receiving the pedestrian while plastically deforming the rear end of the hood panel that has moved upward.
JP 2002-29367 A

  In the hood flip-up device having such a configuration, it is preferable to plastically deform the actuator itself in addition to the hood panel in order to increase the amount of kinetic energy absorbed when the pedestrian is received. However, in the conventional hood flip-up device, the actuator has a configuration in which the vicinity of the upper end is locked after the upward movement, and thus cannot be applied to a configuration in which the actuator is plastically deformed.

  This invention solves the above-mentioned subject, and it aims at providing the hood flip-up apparatus which can absorb a pedestrian's kinetic energy stably by carrying out plastic deformation of the actuator itself.

In the hood flip-up device according to the present invention, an actuator having a cylinder and a piston rod disposed so as to protrude upward from the cylinder is disposed below the rear end of the hood panel in the vehicle,
During operation, the upper end of the rising piston rod is brought into contact with the lower surface side of the rear end of the hood panel, the rear end of the hood panel is raised, and the hood panel at the time of rising is configured to receive a pedestrian,
The piston rod is a hood flip-up device configured to be able to absorb the kinetic energy of the pedestrian by being bent and plastically deformed with the downward movement of the hood panel at the time of receiving the pedestrian of the hood panel,
A receiving seat is formed on the lower surface side of the rear end side of the hood panel so as to abut the upper end of the piston rod when ascending.
The receiving seat is formed so as to extend downward from the front edge side of the receiving surface that receives the upper end of the piston rod, and includes a regulating wall portion that restricts forward movement of the upper end of the piston rod when the piston rod is plastically deformed. Features.

  In the hood flip-up device of the present invention, if the piston rod of the actuator rises during operation, the upper end of the piston rod comes into contact with the receiving surface of the receiving seat provided on the lower surface side of the rear end of the hood panel, The rear end of the hood panel will be raised. And if the rear end of the raised hood panel receives a pedestrian that moves obliquely rearward and downward from above, the piston rod of the actuator is bent and plastically deformed along with the downward movement of the rear end of the hood panel. The kinetic energy of the pedestrian will be absorbed. At this time, in the hood flip-up device of the present invention, a regulating wall portion provided on the receiving seat is disposed in front of the upper end of the piston rod that is in contact with the receiving surface. It is restricted from moving forward by the restriction wall. That is, in the hood flip-up device of the present invention, the piston rod is bent and plastically deformed so that the upper end moves forward (in other words, moves toward the pedestrian intrusion direction side) by the restriction wall portion provided on the receiving seat. Therefore, the upper end is bent and plastically deformed so as to move to the left or right side or the rear side, which is the direction away from the pedestrian entry direction. Therefore, in the hood flip-up device of the present invention, it is possible to prevent the upper end of the piston rod from moving toward the front side opposite to the moving direction of the pedestrian, so that it is easy without increasing the plastic deformation load value. In addition, the piston rod can be bent and plastically deformed by securing a predetermined bending deformation amount, and the kinetic energy of the pedestrian can be absorbed smoothly by the bending plastic deformation of the piston rod.

  Therefore, in the hood flip-up device of the present invention, the actuator itself can be plastically deformed so that the kinetic energy of the pedestrian can be stably absorbed, and the pedestrian is accurately detected by the rear end of the hood panel that has moved up. I can take it. In particular, in the hood flip-up device of the present invention, the deformation direction at the time of bending plastic deformation of the piston rod of the actuator is restricted, so that the amount of energy absorption can also be stabilized.

  Further, in the hood flip-up device of the present invention, the receiving seat formed on the rear end side of the hood panel has a restriction wall portion disposed on the front side of the upper end of the piston rod of the actuator after the upward movement, and the piston rod Before the bending plastic deformation of the hood, when receiving the pedestrian, the hood panel itself should be accurately plastically deformed by bringing the rear surface of the restriction wall into contact with the upper end of the piston rod and suppressing backward displacement. Can do.

  Further, in the hood flip-up device of the present invention, the receiving seat is formed to extend rearward from the restriction wall portion, covers the left and right sides of the upper end of the piston rod, and when the piston rod is plastically deformed, the upper end of the piston rod is If the guide wall portion that guides it toward the rear side is arranged, the piston rod can be bent and plastically deformed so that the upper end faces the rear side, and the deformation direction of the piston rod is made constant rearward. Therefore, the amount of energy absorption during bending plastic deformation of the piston rod can be stabilized.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this specification, unless otherwise specified, the front-rear and up-down directions are the same as the front-rear and up-down directions of the vehicle V, respectively, and the left-right direction is the left-right direction when the rear side is viewed from the front side of the vehicle V. Matches the direction.

  The hood flip-up device (hereinafter abbreviated as “bounce-up device”) U of the embodiment is disposed on the rear end 10c side of the hood panel 10 in the vehicle V, as shown in FIGS. During operation, a piston rod 34 of an actuator 18 (to be described later) is raised, and the rear end 10c of the hood panel 10 is flipped up. In the case of the embodiment, the front bumper 5 of the vehicle V is provided with a sensor 6 capable of detecting or predicting a collision with a pedestrian as shown in FIG. When a working circuit (not shown) detects or predicts a collision between the vehicle V and a pedestrian based on a signal from the sensor 6, a gas generator 31 (see FIG. 8) is activated.

  As shown in FIGS. 1 and 2, the hood panel 10 is disposed so as to cover the upper part of the engine room ER in the vehicle V, and is a hinge portion 11 disposed in the vicinity of the rear end 10 c on both edges in the left-right direction. Thus, the vehicle V is connected to the body 1 side of the vehicle V so that it can be opened and closed by a front opening. The hood panel 10 is made of sheet metal made of aluminum (aluminum alloy) or the like, and as shown in FIG. 3, an outer panel 10a on the upper surface side, an inner panel 10b that is positioned on the lower surface side and has higher strength than the outer panel 10a, It is composed of The food panel 10 is configured to be plastically deformable so that it can absorb the kinetic energy of the pedestrian when receiving the pedestrian. In the embodiment, when the vehicle V collides with the pedestrian, the actuator 18 is activated, the rear end 10c of the hood panel 10 is pushed upward, the rear end 10c of the hood panel 10, the engine room ER, Since a deformation space can be formed between the two, the amount of plastic deformation during plastic deformation can be increased. Furthermore, in the case of the embodiment, a shaft portion 41a of a support rod 41 (to be described later) in the piston rod 34 that has moved the rear end 10c of the hood panel 10 upwardly moves along with the downward movement of the hood panel 10 when receiving a pedestrian. It will be bent plastically deformed (see FIGS. 6 and 7). Therefore, in the case of the embodiment, even if the kinetic energy of the pedestrian is large, the kinetic energy of the pedestrian is absorbed by the plastic deformation of the hood panel 10 itself and the bending plastic deformation of the shaft portion 41a of the piston rod 34. Can do.

  The hinge portion 11 is disposed on the left edge 10d and the right edge 10e on the rear end 10c side of the hood panel 10 (see FIG. 1), and is attached to the hood ridge rein hose 2 on the body 1 side, respectively. The hinge base 12 is fixed to the hood panel 10 and the hinge arm 14 is fixed to the hood panel 10 (see FIG. 3). As shown in FIG. 3, each hinge arm 14 is configured as a shape in which a sheet metal angle member is bent in a substantially semicircular arc shape so as to protrude downward, and a base end 14 a on the hinge base 12 side is supported. The shaft 13 is pivotally connected to the hinge base 12. Moreover, each hinge arm 14 is set as the structure provided with the connection board part 15 extended along the lower surface of the food | hood panel 10 from the front-end | tip 14b in the front-end | tip 14b side which leaves | separates from the base part end 14a. The panel 10 is joined to the lower surface side of the rear end 10c by welding or the like. In the case of the embodiment, the connecting plate portion 15 is a portion to which a guide member 49 of a receiving seat 47 described later is fixed, and is configured such that the left and right width dimensions are wider than the hinge arm 14 (see FIG. 2). Further, a notch recess 14c is formed in the vicinity of the distal end 14b of the hinge arm 14 so that the lower edge is notched in a substantially circular shape. The area around the notch recess 14c is the operation of the actuator 18. At this time, when the piston rod 34 pushes up the rear end 10c of the hood panel 10, the plastic deformation portion 14d is plastically deformed, and the hood panel 10 is allowed to rise (see FIG. 5).

  The support shafts 13 are arranged so that their axial directions are along the left-right direction of the vehicle V. When the hood panel 10 is opened, as shown by the two-dot chain line from the solid line in FIG. 3, the front end 10 f of the hood panel 10 along with the distal end 14 b side of each hinge arm 14 with the left and right support shafts 13 as the rotation center. If the side (refer FIG. 1) is raised by front opening, the food panel 10 can be opened by front opening. Incidentally, when the rear end 10c of the hood panel 10 is raised, the front end 10f side of the hood panel 10 is connected to the body 1 side by a latch mechanism that locks a hood lock striker (not shown) disposed at the front end 10f for normal closing. There will be no departure.

  As shown in FIGS. 2 and 3, a cowl 7 including a highly rigid cowl panel 7a on the body 1 side and a synthetic resin cowl louver 7b above the cowl panel 7a is disposed behind the hood panel 10. It is installed. The cowl louver 7b is disposed so that the rear end side is connected to the lower portion 3a side of the front windshield 3. Further, as shown in FIGS. 1 and 2, front pillars 4 and 4 are disposed on the left and right sides of the front windshield 3.

  As shown in FIGS. 2 and 3, the flip-up device U is disposed in the vicinity of the left and right hinge portions 11 in the hood panel 10, and is an actuator 18 disposed below the rear end 10 c of the hood panel 10. And a receiving seat 47 that is provided on the lower surface side of the hood panel 10 and abuts a head 41b of a support rod 41, which will be described later, of the actuator 18.

  As shown in FIG. 3, the actuator 18 of the embodiment is held by a mounting bracket 43 having a U-shaped cross section that is bolted 44 to a mounting flange 2 b connected to the hood ridge reinhose 2, and the hood panel 10. On the rear end 10c side, it is disposed below each hinge portion 11 below the left edge 10d and the right edge 10e. As shown in FIG. 8, each actuator 18 includes a cylinder 19, a gas generator 31 for allowing a gas as a working fluid to flow into the cylinder 19, and a piston rod disposed so as to protrude upward from the cylinder 19. 34 and a lock mechanism R for restricting the downward movement of the piston rod 34 after the upward movement. In the case of the embodiment, the lock mechanism R includes a lock pin 39 housed in a later-described piston 35 in the piston rod 34 and a lower surface side of the lock pin 39 protruding after the piston 35 moves upward. It is comprised from the latching surface 23 formed in the side.

  As shown in FIG. 8, the cylinder 19 includes a cylindrical main body 20 and caps 25 and 27 that are respectively fixed to the upper and lower ends of the main body 20. The main body 20 includes a sliding portion 21 that slides the piston 35 of the piston rod 34 during the upward movement, and is recessed on the entire inner circumference of the upper end side of the main body 20 that is above the sliding portion 21 in the circumferential direction. It is set as the structure provided with the recessed part 20c. The recessed portion 20c is formed at the protruding position of the lock pin 39 after the piston 35 is moved upward. In the embodiment, the recessed portion 20c is disposed above the sliding portion 21 and has an inner diameter dimension. Is formed from a large diameter portion 22 having a diameter larger than the inner diameter of the sliding portion 21. In the case of the embodiment, the large-diameter portion 22 is composed of a separate member having an inner diameter larger than that of the member constituting the sliding portion 21 and integrated with the member constituting the sliding portion 21 by welding or the like. It has become. The step surface of the large diameter portion 22 from the sliding portion 21, in other words, the lower surface 20 d of the recess 20 c engages the lower side (downward movement direction side) of the protruding lock pin 39, and the piston 35. The locking surface 23 that restricts the downward movement of the (piston rod 34) is configured (see B in FIG. 9).

  The cap 25 disposed on the upper end side of the main body 20 has a substantially cylindrical shape, and includes an insertion hole 25a through which a shaft portion 41a of a support rod 41 (described later) in the piston rod 34 is inserted, and an outer periphery on the lower end side. The surface is provided with a male screw 25b for screwing a female screw 20a provided on the inner peripheral side of the upper end of the main body 20 of the cylinder 19 (the inner peripheral side of the large diameter portion 22). The cap 25 is attached to the main body 20 with the male screw 25b screwed into the female screw 20a in a state where the shaft portion 41a of the support rod 41 is inserted into the insertion hole 25a.

  The cap 27 disposed on the lower end side of the main body 20 is a substantially disc-shaped base end wall portion 28 disposed so as to close the lower end side of the main body 20, and the upper end from the outer peripheral edge of the base end wall portion 28. And a substantially cylindrical peripheral wall portion 29 extending in the direction. An insertion hole 28 a through which a connector 32 (described later) of the gas generator 31 can be inserted is formed in the base end wall portion 28. The peripheral wall portion 29 is provided with a female screw 29 a that is screwed into a male screw 20 b provided on the outer peripheral side of the lower end of the main body 20 of the cylinder 19 on the inner peripheral surface of the upper end side. The cap 27 is in a state in which the gas generator 31 is attached to the base end wall portion 28 by using the peripheral portion of the insertion hole 28a in the base end wall portion 28 and the lower portion of the peripheral wall portion 29. The female screw 29a is screwed into the male screw 20b and is attached to the main body 20.

  A micro gas generator is used as the gas generator 31, and a connector 32 connected to a lead wire 32 a for inputting an electric signal from a control circuit (not shown) is disposed on the lower end surface of the gas generator 31. (See FIG. 8). When an electric signal from a control circuit (not shown) is input via the lead wire 32a, the gas generator 31 burns the built-in explosive to generate combustion gas, and this gas (combustion gas) G is used for operation. The fluid is supplied to the lower surface 35 a side of the piston 35 in the cylinder 19.

  The piston rod 34 includes a piston 35 slidably housed in the cylinder 19 and a support rod 41 connected to the piston 35.

  The piston 35 has a substantially cylindrical shape having an outer diameter dimension that can slide with respect to the sliding portion 21 of the cylinder 19, and accommodates therein a lock pin 39 that constitutes the lock mechanism R. As shown in FIG. 10, the lock pins 39 are arranged at four locations that are radially centered on the central axis of the piston 35, and are respectively housed in the housing recesses 36 formed in the piston 35. . Each lock pin 39 has a substantially cylindrical shape that is disposed so that its axial direction is along the direction orthogonal to the axis of the piston 35 (horizontal direction). Further, as shown in FIGS. 9 and 10, the piston 35 is formed with an inflow passage portion 37 through which the gas G flowing into the cylinder 19 flows into the storage recess 36 in which the lock pin 39 is stored. In the case of the embodiment, as shown in FIGS. 8 and 9, the inflow passage portion 37 is formed so as to extend upward from the center of the lower surface 35 a of the piston 35, and is configured to have a lower end side opened. 37a and a horizontal flow path portion 37b extending in four directions from the upper end of the vertical flow path portion 37a toward the storage recess 36 side. When the gas G flowing into the lower surface 35 a side of the piston 35 in the cylinder 19 flows into the storage recess 36 in which the lock pin 39 is stored via the inflow path portion 37, each lock pin 39 is connected to the piston 35. It will protrude along the axis orthogonal direction of piston 35 so that it may go to an outer peripheral side (refer B of Drawing 8 and B of Drawing 9).

  In the case of the embodiment, the lock pin 39 receives the pressure of the gas G that has flowed into the storage recess 36 via the inflow passage portion 37 when the piston 35 moves upward and is disposed at the site of the large diameter portion 22. Instantly, it protrudes from the housing recess 36 along the direction orthogonal to the axis of the piston 35 so as to go to the outer peripheral side of the piston 35 (see B in FIG. 8 and B in FIG. 9). At this time, the lock pin 39 brings the front end surface 39c into contact with the inner peripheral surface 22a of the large diameter portion 22 in a state where the base portion 39a side is stored in the storage recess 36. That is, the lock pin 39 is disposed so as to straddle between the locking surface 23 and the storage recess 36, and the distal end portion in a state where the distal end surface 39 c is in contact with the inner peripheral surface 22 a of the large diameter portion 22. The lower surface of 39b is locked to the locking surface 23, and the downward movement of the piston 35 is restricted.

  In the case of the embodiment, the outer peripheral surface near the lower end of the piston 35 below the storage recess 36 (lock pin 39) is pressed against the inner peripheral surface 21 a of the sliding portion 21, and the sliding portion 21. An O-ring 40 that prevents gas leakage from the piston 35 is disposed (see FIGS. 8 and 9).

  The support rod 41 has a round bar-like shaft portion 41a disposed along the axial direction (vertical direction) of the cylinder 19, and is disposed on the upper end side of the shaft portion 41a and has a larger outer diameter than the shaft portion 41a. A substantially columnar head 41b. When the piston rod 34 moves upward, the head portion 41b comes into contact with a receiving surface 48 of a receiving seat 47 provided on the hood panel 10 side and pushes up the rear end 10c of the hood panel 10 upward. Moreover, the support rod 41 is comprised from metal materials, such as steel which makes the site | part of the axial part 41a bendable and plastically deformable, and is comprised integrally with the piston 35 in the case of embodiment.

  As shown in FIGS. 3 to 5, the receiving seat 47 abuts the head 41 b of the support rod 41 that has moved upward, and extends downward from the receiving surface 48 that receives the head 41 b and the periphery of the receiving surface 48. And a guide member 49 that guides the moving direction of the head 41b when the hood panel 10 moves downward. In the case of the embodiment, the receiving surface 48 is composed of a portion 15a disposed above the head 41b in the connecting plate portion 15 of the hinge portion 11 (see FIGS. 2 to 4). As shown in FIG. 4, the guide member 49 has a substantially inverted U shape with the rear side opened when viewed from below, and is formed so as to protrude downward from the periphery of the receiving surface 48. Thus, the piston rod 34 is configured to substantially follow the axial direction of the piston rod 34 when the rear end 10c of the hood panel 10 is moved upward. The guide member 49 is fixed to the portion of the connecting plate portion 15 of the hinge arm 14 at a position around the receiving surface 48 by welding or the like. As shown in FIG. The height dimension h1 is set to be slightly larger than the height dimension h2 of the head portion 41b so that when the head portion 41b comes into contact with the receiving surface 48, the periphery of the head portion 41b can be covered over the entire upper and lower regions. (See FIG. 5). The guide member 49 is configured such that the rear opening width W1 is larger than the outer diameter D1 of the head 41b so that the head 41b can be inserted (see FIG. 4).

  The guide member 49 is configured to cover the front side and the left and right sides of the head portion 41b in contact with the receiving surface 48. Specifically, the guide member 49 is formed to extend downward from the front edge side of the receiving surface 48. The restriction wall 50 that covers the front of the head 41b and the guide that is formed so as to extend rearward from the left and right ends of the restriction wall 50 and covers the left and right sides (the vehicle inner side I and the vehicle outer side O) of the head 41b. The wall portions 51A and 51B are provided. The restriction wall portion 50 covers the front of the head portion 41b and restricts the head portion 41b from moving forward when the shaft portion 41a of the support rod 41 is plastically deformed. The peripheral surface 50a is curved in a substantially semicircular arc shape along the outer peripheral surface of the head portion 41b. Further, the regulation wall portion 50 is formed in a substantially wedge-shaped section with a narrowed bottom so that the wall thickness is reduced toward the lower end side which is the front end side, and the inner peripheral surface 50a is positioned rearward from the lower end side. In such a manner, it is configured to be inclined with respect to the axial direction of the piston rod 34. The guide wall portions 51A and 51B are formed so as to extend rearward from the left and right ends of the restriction wall portion 50, respectively, and the head portion 41b is moved rearward during the bending plastic deformation of the shaft portion 41a of the support rod 41. It is for guiding to turn. Each of the guide wall portions 51A and 51B has a substantially narrow wedge-shaped cross-section that decreases in thickness toward the lower end side that is the front end side, and the inner peripheral surface 51a is used as the inner peripheral surface of the regulating wall portion 50. It is comprised so that it may continue from 50a gently. Specifically, the inner peripheral surfaces 51a of the guide wall portions 51A and 51B are configured to be inclined with respect to the axial direction of the piston rod 34 so as to widen the mutual separation distance toward the lower end side. . In other words, the guide member 49 is configured so that the internal space is narrowed up and down over the receiving surface 48. In the case of the embodiment, the guide wall portions 51A and 51B have different width dimensions in the front-rear direction, and the guide wall portion 51A arranged so as to cover the vehicle interior I of the head portion 41b is the shaft portion 41a. In order to reliably prevent the head 41b from moving toward the vehicle inner side I during bending plastic deformation, the width of the head 41b extends to an area behind the head 41b. The guide wall 51B disposed so as to cover the vehicle outer side O covers the region slightly rearward from the center in the front-rear direction of the head 41b, and does not completely cover the vehicle outer side O of the head 41b. The width is formed so as to expose the end side.

  In the flip-up device U of the embodiment, the gas generator 31 in the actuator 18 is operated when an operation circuit (not shown) detects or predicts a collision with the pedestrian of the vehicle V by a signal from the sensor 6. As shown in FIG. 8, the generated gas G pushes up the piston 35 in the main body 20 of the cylinder 19, and the head 41 b of the support rod 41 constituting the upper end 34 a of the piston rod 34 is moved to the receiving surface of the receiving seat 47. 48, the rear end 10c of the hood panel 10 is raised so as to widen the gap with the lower cowl 7. The lock pin 39 constituting the lock mechanism R housed in the piston 35 corresponds to the locking surface 23 provided on the inner peripheral surface of the cylinder 19, that is, the large diameter portion 22 of the main body 20 of the cylinder 19. If the piston 35 rises until it is disposed at the site, the lock pin 39 is instantaneously protruded from the storage recess 36 and is disposed so as to straddle between the storage recess 36 and the locking surface 23. (See B in FIG. 8 and B in FIG. 9), the piston rod 34 is restricted from moving downward. Thereafter, with the rear end 10c of the raised hood panel 10 supported on the lower surface side by the head 41b of the support rod 41 as shown in FIG. 5, the angle α (see FIG. 6) with respect to the horizontal direction is set to 65 °. As an extent, if a pedestrian moving diagonally rearward and downward from above is received, the rear end 10c of the hood panel 10 is lowered while plastically deforming in response to the kinetic energy F of the pedestrian, and the hood panel 10 With the downward movement, the shaft portion 41a of the support rod 41 with which the head portion 41b is brought into contact with the receiving surface 48 is bent and plastically deformed so as to absorb the kinetic energy F of the pedestrian ( (See FIGS. 6 and 7).

  At this time, in the flip-up device U of the embodiment, the restriction wall portion 50 of the guide member 49 is disposed in front of the upper end 34a (the head 41b of the support rod 41) of the piston rod 34 that is in contact with the receiving surface 48. Therefore, the upper end of the piston rod 34 (the head 41b of the support rod 41) is restricted from moving forward by the restriction wall 50. That is, in the flip-up device U according to the embodiment, the piston rod 34 moves the head 41b on the upper end 34a side forward by the restriction wall portion 50 provided on the receiving seat 47 (in other words, toward the pedestrian intrusion direction side). Bend plastically deformed so as to be moved), and bend plastically deformed so as to move the head 41b to the left or right side or the rear side, which is the direction away from the pedestrian entry direction. Become. Therefore, in the flip-up device U of the embodiment, the head 41b on the upper end 34a side of the piston rod 34 can be prevented from moving to the front side opposite to the moving direction of the pedestrian, thereby increasing the plastic deformation load value. Therefore, the shaft portion 41a of the piston rod 34 can be easily bent and plastically deformed with a predetermined amount of bending deformation, and the kinetic energy of the pedestrian can be reduced by bending plastic deformation of the shaft portion 41a of the piston rod 34. It can be absorbed smoothly.

  Therefore, in the flip-up device U of the embodiment, the kinetic energy of the pedestrian can be stably absorbed by plastically deforming the actuator 18 itself, and the pedestrian is moved by the rear end 10c of the hood panel 10 that has moved up. Can be taken accurately. In particular, in the flip-up device U of the embodiment, the deformation direction at the time of bending plastic deformation of the shaft portion 41a of the piston rod 34 of the actuator 18 is restricted, so that the energy absorption amount can also be stabilized.

  Further, in the flip-up device U of the embodiment, the receiving seat 47 formed on the rear end 10c side of the hood panel 10 has the upper end 34a (the head 41b of the support rod 41) of the piston rod 34 of the actuator 18 after the upward movement. The restriction wall 50 is disposed in front of the hood panel 10 and the hood panel 10 itself receives the pedestrian before the bending plastic deformation of the shaft portion 41a of the piston rod 34. The (rear surface) is brought into contact with the upper end 34a of the piston rod 34 (the head portion 41b of the support rod 41), so that it can be accurately plastically deformed while suppressing backward displacement.

  Furthermore, in the flip-up device U of the embodiment, the receiving seat 47 is formed so as to extend rearward from the restriction wall portion 50, and the left and right sides of the upper end 34a of the piston rod 34 (the head 41b of the support rod 41) are provided. Since the guide wall portions 51A and 51B that guide the head portion 41b so as to face the rear side when the shaft portion 41a of the piston rod 34 is plastically deformed are disposed, the shaft portion 41a of the piston rod 34 is disposed. The head 41b on the upper end 34a side can be bent and plastically deformed so as to face the rear side. Specifically, in the case of the embodiment, the head 41b on the upper end 34a side of the piston rod 34 is kept in contact with the receiving surface 48 (the connecting plate portion 15) during the bending plastic deformation of the shaft portion 41a. Thus, the guide wall portions 51A and 51B are guided in the moving direction so as to protrude rearward from the opening on the rear side of the guide member 49 and move backward while contacting the lower surface of the connecting plate portion 15 ( (See FIG. 7). As a result, in the flip-up device U of the embodiment, the deformation direction of the shaft portion 41a of the piston rod 34 can be made constant rearward, and the amount of energy absorbed during bending plastic deformation of the shaft portion 41a of the piston rod 34 can be reduced. Can be stabilized. Of course, if such a point is not taken into consideration, a guide member having only a regulating wall portion and no guide wall portion may be used.

  In the embodiment, the regulation wall 50 and the guide walls 51A and 51B constituting the guide member 49 are each substantially wedge-shaped in cross section so that the wall thickness decreases toward the lower end side, and the inner peripheral surfaces 50a and 51a. , 51a are inclined with respect to the axial direction of the piston rod 34. In other words, in the embodiment, the guide member 49 has a configuration in which the inner peripheral surfaces 50 a, 51 a, 51 a are inclined so as to widen the opening toward the lower end side, in other words, the inner space is narrowed up toward the receiving surface 48. Thus, at the time of a temporary collision with the pedestrian of the vehicle V, the hood panel 10 is slightly displaced back and forth, and the head 41b of the support rod 41 that has moved up when the actuator 18 is actuated is temporarily restricted by the restriction wall. Even if it hits the inner peripheral surfaces 50a, 51a, 51a of the portion 50 and the guide wall portions 51A, 51B, the upward movement is not prevented, and the head 41b is guided by the inner peripheral surfaces 50a, 51a, 51a. The rear end 10c of the hood panel 10 can be smoothly pushed up by the head 41b of the support rod 41 which can be brought into contact with the receiving surface 48 and brought into contact with the receiving surface 48. It is possible. Of course, if such a point is not taken into consideration, the regulation wall portion and the guide wall portion constituting the guide member may be configured as a flat plate having a constant thickness.

  Furthermore, in the guide member 49 of the embodiment, the front and rear width dimensions of the guide wall portion 51A arranged on the vehicle inner side I of the head portion 41b are increased, and the guide member 49 extends to the rear of the head portion 41b. When the shaft 41a is plastically deformed, the head 41b can be prevented from facing toward the vehicle inner side I when the head 41b is directed to the rear side by the guide walls 51A and 51B. It is possible to reliably prevent the shaft portion 41a from being bent and plastically deformed so as to face the inner side I. In the embodiment, the width dimension before and after the guide wall 51B disposed on the vehicle outer side O of the head 41b is configured to be smaller than the width dimension before and after the guide wall 51A. Of course, as shown by a two-dot chain line in FIG. 4, the front and rear width dimensions of the two guide wall portions may be substantially the same.

  In the embodiment, the receiving surface 48 of the receiving seat 47 that receives the head portion 41 b of the support rod 41 that is the upper end 34 a of the piston rod 34 is constituted by the connecting plate portion 15 that extends from the hinge arm 14 of the hinge portion 11. However, the member constituting the receiving surface is not limited to this, and separately from the hinge arm, a receiving seat using a plate material such as a metal plate constituting the receiving surface is separately provided on the lower surface side of the hood panel. It is good also as a structure provided in.

1 is a perspective view of a vehicle on which a hood flip-up device according to an embodiment of the present invention is mounted. It is a partial enlarged plan view of the vehicle carrying the hood flip-up device of the embodiment. It is a schematic longitudinal cross-sectional view along the front-back direction which shows the hood flip-up apparatus and vehicle hinge part of embodiment, and respond | corresponds to the III-III site | part of FIG. It is a schematic sectional drawing which shows the receiving seat in the hood flip-up apparatus of embodiment, and is the cross-sectional view along the front-back direction corresponding to the IV-IV site | part of FIG. 3, and the longitudinal cross-sectional view along the up-down direction. It is a schematic sectional drawing which shows the time of the action | operation of the hood flip-up apparatus of embodiment. It is the schematic which shows the plastic deformation state of the support rod of an actuator in the hood flip-up apparatus of embodiment. FIG. 7 is a schematic view showing a plastic deformation state of a support rod of an actuator in the hood flip-up device of the embodiment, and is a view showing a state further deformed than FIG. 6. It is a schematic longitudinal cross-sectional view of the actuator in the hood flipping-up apparatus of embodiment, and shows the time before an operation | movement and the time of an operation completion. In the actuator of the hood raising apparatus of embodiment, it is a general | schematic expanded longitudinal cross-sectional view which shows the site | part of a locking mechanism, and shows the time before an action and the time of an action completion. In the actuator of the hood flip-up device of the embodiment, it is a schematic enlarged cross-sectional view showing a part of the lock mechanism, and shows before operation and when operation is completed.

Explanation of symbols

7 ... Cowl,
10 ... Food panel,
10c ... rear end,
11 ... Hinge part,
18 ... Actuator,
19 ... cylinder,
34 ... Piston rod,
35 ... piston,
39 ... Lock pin,
41 ... support rod,
41a ... shaft part,
41b ... head,
47 ...
48 ... Reception,
49 ... Guide member,
50 ... Regulatory wall,
51 (51A, 51B) ... guide wall,
R: Lock mechanism,
V ... Vehicle,
U ... Hood jumping device.

Claims (2)

An actuator having a cylinder and a piston rod disposed so as to protrude upward from the cylinder is disposed below the rear end of the hood panel in the vehicle,
During operation, the upper end of the piston rod that rises is brought into contact with the lower surface side of the rear end of the hood panel, the rear end of the hood panel is raised, and the hood panel at the time of raising is configured to receive a pedestrian. ,
The piston rod is configured to be able to absorb the kinetic energy of the pedestrian by being bent and plastically deformed with the downward movement of the hood panel at the time of receiving the pedestrian of the hood panel. A device,
On the lower surface side of the rear end side of the hood panel, a receiving seat for contacting the upper end of the piston rod at the time of ascent is formed,
The receiving seat is formed to extend downward from the front edge side of the receiving surface that receives the piston rod upper end, and includes a regulating wall portion that regulates forward movement of the piston rod upper end when the piston rod is plastically deformed. A hood jumping device characterized by that. The receiving seat is formed so as to extend rearward from the restriction wall portion, covers the left and right sides of the upper end of the piston rod, and directs the upper end of the piston rod toward the rear side during plastic deformation of the piston rod. The hood flip-up device according to claim 1, further comprising a guide wall portion for guiding.

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