JP4418311B2 - Front hood structure for vehicles - Google Patents

Description

  The present invention relates to a structure of a vehicle front hood, and more particularly to a vehicle front hood structure provided with a hood grill.

  The vehicle front hood is adjacent to the front of the windshield, and both rear ends are supported by the vehicle body by hood hinges, and the engine room is kept sealed by a hood lock device provided at the front center. It is configured.

  However, since the front hood is relatively flat and has a large area, if the rigidity is insufficient, vibration may occur due to the vibration of the vehicle body and the traveling wind accompanying traveling, and sufficient rigidity is required. .

  On the other hand, when an excessive impact load is applied to the front hood from the front, the front hood is pushed backward by this impact load, and the windshield is prevented from being broken by the rear end of the front hood moving backward. Is required.

  As a countermeasure, for example, FIG. 8 shows a plan view of the front hood 101 with the outer panel 102 omitted, and FIG. 9 shows a sectional view taken along the line II-II of FIG. Are provided with a reinforcing structure having a hollow cross-sectional shape formed by joining the peripheral portions and the vicinity of both ends of the rear portion is coupled to the vehicle body main body in front of the windshield via a hood hinge (not shown).

  The inner panel 103 bulges downward along its front edge, both side edges, and rear edge, and cooperates with the outer panel 102 to form a continuous hollow cross-sectional shape. 112, a posterior standing bone 113, a central longitudinal standing bone 114 installed between the central portions of the anterior standing bone 111 and the posterior standing bone 113, and a central portion of the anterior standing bone 111 and the posterior standing bone 113. An oblique bone 115 erected between the end portions is formed to secure the rigidity of the front hood 101.

  On the other hand, the bead portions 112a and 114a that are low-rigidity portions at the respective portions of the side erected bone 112, the central longitudinal erected bone 114, and the oblique erected bone 115 on a line substantially along the vehicle width direction at the center portion in the front-rear direction of the inner panel 103 115a and when an excessive impact load is applied to the front portion of the front hood 101 from the front, the bead portions 112a, 114a, 115a are moved upward as shown by phantom lines in FIG. It is known that the front hood 101 is prevented from retreating by being bent and deformed in a letter shape, and a situation in which the windshield is broken through the rear end of the front hood 101 (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 2-41883

  According to Patent Document 1, a hollow cross-sectional shape is formed by the cooperation of the inner panel 103 and the outer panel 102, and the rigidity of the front hood 101 is improved. However, the front hood 101 to which various impact loads are applied from the front induces a complicated behavior, and the side vertical bone 112 and the central longitudinal vertical bone 114 of the inner panel 103 constituting the front hood 101 having the complicated behavior. In addition, it is extremely difficult to reliably bend and deform the bead portions 112a, 114a, and 115a formed on the oblique bone 115, respectively, and it is also difficult to predict the behavior of the complicated front hood 101 in advance.

  In addition, in a vehicle in which a resin hood grille is attached to an air scoop formed on the outer panel of the front hood, when an excessive impact load is applied to the front hood, the hood is affected by the impact of the deformation of the front hood. The grill may be damaged, and the damaged food grill may be scattered.

  Accordingly, an object of the present invention made in view of such a point is that the windshield is pierced by the front hood by ensuring the reliable deformation of the front hood when an excessive impact load acts on the front hood. It is an object of the present invention to provide a vehicle front hood structure that can reliably prevent the occurrence of damage to the hood grill attached to the front hood and prevent the broken hood grill from scattering.

  The invention of the front hood structure for a vehicle according to claim 1, which achieves the above object, comprises an outer panel and an inner panel stretched on the lower surface of the outer panel, and both rear ends are attached to the vehicle body via hood hinges. In the vehicle front hood structure in which the front end is supported by the vehicle body member by the hood lock device and the hood grille is mounted on the upper surface of the outer panel, the front hood is mounted on the front side of the mounting portion of the hood grille. A front low-rigidity portion extending in the width direction and a rear low-rigidity portion extending in the vehicle width direction behind the mounting portion of the hood grill are provided.

  According to a second aspect of the present invention, in the vehicle front hood structure according to the first aspect, the inner panel is formed to bulge downward along both side edges of the inner panel, and the rear end has a hood hinge. Left and right side standing bones supported by the vehicle body via the front edge, the front side standing bones that are formed to bulge downward along the front edge and are connected to the front ends of the side side standing bones, A front low-rigidity portion that is formed to protrude toward the outer panel along the rear edge of the standing bone, and a rear end is connected to the front-rear direction intermediate portion of the left and right side standing bones, and the front portion is connected to the front portion. Left and right oblique vertebrae formed to bulge downward across the front end located in the vicinity of the center portion in the width direction of the front standing bone across the low-rigidity portion, and the oblique standing bones of the side standing bones The rear part is formed to extend in the vehicle width direction, including the low-rigidity part formed at the rear of the connecting part. And a sex portions, said hood grille, characterized in that attached to the upper surface of the outer panel between the said front low rigidity portion and the rear low-rigidity portion.

  According to a third aspect of the present invention, in the vehicle front hood structure according to the second aspect, the inner panel has a slanted low-rigidity portion that protrudes toward the outer panel along the front edge of the oblique bone, The hood grill is attached to the upper surface of the outer panel between the oblique low rigidity portion and the rear low rigidity portion.

  According to a fourth aspect of the present invention, in the front hood structure for a vehicle according to the second or third aspect, the inner panel is a front central low-rigidity portion formed to project toward the outer panel between the left and right oblique vertebra front ends. And the hood grille is attached to the upper surface of the outer panel between the front central low-rigidity part and the rear low-rigidity part.

  According to a fifth aspect of the present invention, in the front hood structure for a vehicle according to the fourth aspect, the front central low-rigidity portion includes a front concave portion that is formed to protrude toward the outer panel between the front ends of the left and right oblique vertebrae, and It has the back side recessed part which was formed in the back of the front side recessed part and protruded in the outer panel side continuously.

  According to a sixth aspect of the present invention, in the vehicle front hood structure according to any one of the first to fifth aspects, a hood lock phosphorus hose is provided along the front edge of the front hood between the outer panel and the inner panel. The front low rigidity portion is formed between the phosphorus hose and the hood grill.

  According to the first aspect of the present invention, in the front hood in which both ends of the rear portion are mounted and supported on the vehicle body body via the hood hinge, the front portion extending in the vehicle width direction forward and rearward from the mounting portion of the hood grille, respectively. Since it has a low rigidity part and a rear low rigidity part, when an excessive impact load acts on the front hood from the front, the front hood is bent along the front low rigidity part by the impact load to absorb the impact energy. To do. Furthermore, it is reliably bent along the rear low-rigidity part to absorb the impact energy and further reduce the impact.

  On the other hand, the region between the front low-rigidity portion and the rear low-rigidity portion of the front hood to which the hood grille is attached is prevented from being deformed or greatly suppressed, and the front low-rigidity portion and the rear low-rigidity portion are bent and deformed. In combination with the fact that the impact energy is efficiently absorbed and the impact is mitigated, it is possible to prevent the hood grill from being broken and the hood grill from being scattered.

  The invention of claim 2 is a specific example of the inner panel, and the rear end of the inner panel is connected to the left and right side erected bones supported by the vehicle body body via the hood hinge, and the front ends of the left and right side erected bones. By forming the front standing bone and the left and right oblique standing bones, the rigidity over the entire surface of the front hood can be secured.

  Further, the vehicle width includes a front low rigidity portion projecting to the outer panel side along the rear edge of the front standing bone and a low rigidity portion formed at the rear of the connecting portion of the side standing bone with the oblique bone. It has a rear low rigidity portion formed extending in the direction. As a result, when an excessive impact load acts on the front hood from the front, the impact load absorbs the impact energy by being bent along the front low rigidity portion formed along the rear edge of the front standing bone. Reduce the impact. Further, as the front low rigidity part is bent and deformed, the front end of the front erection and the front end of the erected bone come into contact with each other, and the impact load is transferred from the front erected bone to the side erected bone via the side erected and oblique vertebrae. It is transmitted to the formed low-rigidity part, and is reliably bent and deformed along the rear low-rigidity part including the low-rigidity part formed on the side erected bone, so that the impact energy is absorbed and the impact is alleviated.

  On the other hand, the region between the front low-rigidity part and the rear low-rigidity part of the front hood to which the hood grille is attached is prevented from being deformed or extremely prevented from being deformed, and the hood grille is damaged or the damaged hood grille is scattered. Can be prevented.

  According to the third aspect of the present invention, since the slanted low rigidity portion is formed to protrude toward the outer panel along the front edge of the oblique bone, an excessive impact load is applied to the front hood at a position offset from the front center. As a result, the front low-rigidity part and the oblique low-rigidity part are folded, and absorption of impact energy is obtained. Further, with the deformation of the front low-rigidity part and the oblique low-rigidity part, the central part of the front erected bone and the front end part of the oblique erection come into contact with each other, and the impact load is changed from the front erected bone to the side erected and oblique It is transmitted to the low-rigidity part formed on the side posterior bone via the erected bone, and the rear low-rigidity part including the low-rigidity part formed on the side erected bone is efficiently bent to further absorb the impact energy. Shock is reduced.

  On the other hand, the area between the low-rigidity part and the rear-low-rigidity part of the front hood to which the hood grille is attached is prevented from being deformed or extremely prevented from deforming, preventing damage to the hood grille and scattering of the damaged hood grille. can do.

  According to the invention of claim 4, the front central portion of the front hood is formed between the front ends of the left and right oblique bones so as to protrude toward the outer panel, so that an excessive impact load acts on the front center of the front hood from the front. At this time, the impact energy is absorbed and the impact is alleviated by the deformation of the front center low rigidity portion. Further, the deformation of the front low-rigidity portion is ensured starting from the deformation of the front center low-rigidity portion, and more efficient impact energy absorption can be ensured by the continuous deformation of the front low-rigidity portion.

  According to the invention of claim 5, the front central portion is formed by the front concave portion projecting to the outer panel side and the rear concave portion projecting to the outer panel side continuously in a step shape in the front concave portion. The deformation of the low-rigidity portion becomes more reliable and the deformation of the front low-rigidity portion becomes more reliable, and the rear-side concave portion is deformed continuously after the deformation of the front-side concave portion, so that the impact energy can be absorbed continuously.

  According to the invention of claim 6, by providing the hood lock phosphorus hose along the front edge of the front hood, the rigidity of the front end portion of the front hood is improved and the deformation of the front low-rigidity portion becomes more reliable.

  Embodiments of a vehicle front hood structure according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a front perspective view of a vehicle 1 having a front hood structure according to the present invention. 2 is a windshield, 10 is a front portion of the windshield 2, and the vicinity of both ends of the rear is a hood hinge 51 (see FIG. 7). This is a front hood that is supported by the vehicle body 3 so as to be swingable and covers the engine room so that it can be opened and closed. The front hood 10 is configured so that the front portion is smoothly curved downward, and the engine room is held in a closed state by a hood lock device attached to the center of the front portion.

  2 is a plan view of the front hood 10 as viewed from the direction of arrow A in FIG. 1, FIG. 3 is a perspective view of the front hood 10 as viewed from below, FIG. 4 is a cross-sectional view taken along the line II of FIG. Is an enlarged view of part B in FIG. 4, and FIG. 6 is an enlarged view of part C in FIG. FIG. 2 shows a state in which the left half of the outer panel is missing.

  The front hood 10 has an outer panel 11 that forms an upper surface of the front hood 10 and an inner panel 21 that is stretched on the lower surface of the outer panel 11. An appropriate portion of the outer panel 11 and the inner panel 21 in the central region is bonded with an adhesive. A reinforcing structure having a hollow cross-sectional shape is provided in which the peripheral portions are bonded together by hemming while being bonded.

  The outer panel 11 has a shape that follows the outer shape of the front hood 10 and has a substantially rectangular plate shape whose front portion smoothly curves downward. The bulge 12 is integrally raised at the center in the vehicle width direction of the outer panel 11. is doing. The bulge 12 has a rear edge 12a extending in the vehicle width direction along the rear edge of the front hood 10, curved forward from both ends of the rear edge 12a, and the side edge 12b extending in the front-rear direction. An air scoop 13 is formed which has a letter-shaped outer shape and protrudes at the front end and serves as an air intake for cooling the intercooler. Further, a substantially rectangular hood grille 14 made of resin extending forward from the air scoop 13 along the upper surface of the outer panel 11 is attached.

  On the other hand, the inner panel 21 has an outer shape substantially corresponding to the outer shape of the outer panel 11, and has a substantially cross-sectional hat formed so as to bulge downward along the front edge of the front hood 10 and to bend both ends backward. Shaped front standing bone 23, and side standing bones 24 and 25 having a substantially hat-shaped cross section in which the front end is continuous with each end of the front standing bone 23 and bulges downward along the left and right side edges, respectively. And each end has a rear part standing bone 26 which is continuous with the rear ends of the side standing bones 24 and 25 and bulges downward along the rear edge.

  A plate-shaped hood lock phosphorus hose 22 is disposed along the front edge of the front hood 10 between the front erected bone 23 and the outer panel 11. While ensuring the rigidity of the front part of the front hood 10 along the edge, a hood lock device (not shown) is provided at the center. On the other hand, hood hinge attaching portions 27 and 28 for attaching and supporting the hood hinge 51 are formed at the rear end portions of the side erected bones 24 and 25 connected to the respective end portions of the rear erected bone 26.

  A central lateral bone 30 having a substantially hat-shaped cross section that bulges downward and extends in the vehicle width direction is formed at the center in the front-rear direction. At least the rear edge of the central lateral bone 30 is located behind the air scoop 13 of the bulge 12 formed on the outer panel 11, and is separated from the central lateral bone 30 between the central lateral bone 30 and the rear standing bone 26. Then, the sub erected bones 31a to 31f which are rectangular and bulge downward are arranged in a line. Openings are opened at the tops of the sub-standing bones 31a to 31f, respectively.

  Further, both ends in the vehicle width direction of the central lateral erection 30 are curved backward and close to the sub erected bones 31a and 31f. In this way, by separating the central lateral bone 30 and each of the sub-vertical bones 31a to 31f, a bead-like projection is continuously formed on the outer panel 11 side along the rear edge of the central lateral bone 30 in the vehicle width direction. A continuous portion having a relatively low rigidity is formed.

  A front concave portion 34 that extends upward along the rear edge of the front standing bone 23, that is, extends to the outer panel 11 side, and a rear concave portion 35 that is continuous in a step shape are formed behind the front concave portion 34 at the center in the vehicle width direction. Has been. The vertical vertebrae 36 and 37 having a substantially hat-shaped cross section that bulges from the vicinity of the central part in the front-rear direction of the side erected bones 24 and 25 toward the central part of the front erected bone 23 are formed continuously. The front recess 34 is formed between the front ends of 36 and 37. That is, the central low-rigidity portion 21c is formed by the front concave portion 34 and the rear concave portion 35 protruding toward the outer panel 11 at the rear of the central portion of the front standing bone 23 formed along the front edge of the front hood 10. And the front center portion of the front hood 10 extending from the front center of the front hood 10 to the left and right, and the tilted bones 36, 37 extending obliquely rearward from the vicinity of the center portion of the front portion 23. The standing bones are arranged radially from the rear to the rear.

  Further, between the front standing bone 23 and the oblique standing bone 36, sub-standing bones 38a, 38b, and 38c that are annularly bulged downward in order from the front recessed portion 34 side to the side standing bone 24 side are arranged. Yes. Similarly, between the front erected bone 23 and the oblique erected bone 37, sub erected bones 39a, 39b, and 39c that are annularly bulged downward in order from the front recessed portion 34 side to the side erected bone 25 side are arranged. .

  These sub-standing bones 38a, 38b, 38c and the front standing bone 23 form the inner panel 21, and a bead shape on the outer panel 11 side from the front concave portion 34 to the side standing bone 24 along the rear edge of the front standing bone 23. A portion having a relatively low rigidity is formed continuously. Similarly, the sub erected bones 39a, 39b, 39c and the front erected bone 23 form a bead shape on the inner panel 21 along the rear edge of the front erected bone 23 from the front concave portion 34 to the side erected bone 25 toward the outer panel 11 side. A portion having a relatively low rigidity is formed continuously. Further, the sub erected bones 38a, 38b, 38c and the inclined vertebra 36 continuously project the inner panel 21 along the front edge of the inclined erected bone 36 toward the outer panel 11 in a bead shape and have relatively low rigidity. . Similarly, the sub erected bones 39a, 39b, 39c and the oblique erected bone 37 continuously form a portion having a relatively low rigidity by projecting in a bead shape along the front edge of the front erected bone 23 toward the outer panel 11 side.

  That is, the front portion of the inner panel 21 is formed with a front standing bone 23 that is formed to bulge downward along the front edge and has both ends connected to the front ends of the side standing bones 24 and 25. A front center low-rigidity portion 21c composed of a front concave portion 34 and a rear concave portion 35 is formed at the rear of the central portion of the bone 23, and the front portion is formed to protrude toward the outer panel 11 along the rear edge of the front standing bone 23. The low rigidity portion 23b is continuously formed in the vehicle width direction. Further, left and right oblique vertebrae 24 and 25 having front ends positioned in the vicinity of the center portion in the vehicle width direction of the front erected bone 23 across the front low rigidity portion 21b are formed. Diagonally low-rigidity portions 21d and 21e are formed so as to protrude toward the outer panel 11 along the edge.

  Sub vertical ridges 41a and 41b bulging downward in a rectangular ring shape are arranged between the central lateral erected bone 30 and the rear recess 35, and an opening is opened at the top of each of the sub erected bones 41a and 41b. .

  Furthermore, it is relatively low in rigidity formed between the central lateral bone 30 and the sub-vertical bones 31a to 31f in the vicinity of the connecting portion behind the connecting portion of the side erected bone 24 and the oblique erected bone 36. A bead portion 24a that is a low-rigidity portion that is continuous in the vehicle width direction is formed at the center in the front-rear direction of the side erected bone 24 that is substantially on the extension line of the portion. Similarly, a comparatively rigid structure formed between the central standing bone 30 and each of the sub standing bones 31a to 31f in the vicinity of the connecting portion behind the connecting portion of the side standing bone 25 and the oblique standing bone 37. A bead portion 25a that is a low-rigidity portion that is continuous in the vehicle width direction is formed at the center in the front-rear direction of the side erected bone 25 that is substantially on the extension line of the lower portion.

  The inner panel 21 thus formed has a substantially rectangular shape in which rigidity is secured by the rear regions 24b and 25b, the rear standing bone 26, and the sub standing bones 31a to 31f rather than the bead portions 24a and 25a of the side standing bones 24 and 25. The rear region 21A and the front regions 24c and 25c of the beads 24a and 25a of the lateral erected bones 24 and 25, the central lateral bone 30, the oblique erected bones 36 and 37, the sub erected bones 38a to 38c, and the sub erected bone 39a To 39c, the bead 24a, 25a recessed in the side erected bones 24, 25 and the central lateral bone 30 between the sub erected bones 41a, 41b and the substantially rectangular middle region 21B. A rear low-rigidity portion 21a extending in the vehicle width direction with a relatively low rigidity is formed between the standing bones 31a to 31f. Further, the front concave portion 34 and the front standing bone 23 are provided between the middle portion 21B and the front region 21C in which rigidity is secured along the front edge of the front hood 10 by the front standing bone 23 and the hood lock phosphorus hose 22. And the sub standing bones 38a to 38c and 39a to 39c form a front low-rigidity portion 21b that has a relatively low rigidity and extends in the vehicle width direction.

  Further, the sub erected bones 38a, 38b, and 38c and the inclined erected bone 36 form an oblique low rigidity portion 21d that protrudes toward the outer panel 11 over the side erected bone 24 along the front edge of the inclined erected bone 36. Similarly, the inclined low rigidity portion 21e is formed along the front edge of the inclined bone 37 by the sub standing bones 39a, 39b, 39c and the inclined bone 37.

  The front hood 10 formed by the outer panel 11 and the inner panel 21 is substantially rear in the plan view by the rear low rigidity portion 21a, the front low rigidity portion 21b, and the slant low rigidity portions 21d and 21e formed on the inner panel 21. The low rigidity portion 21a, the front low rigidity portion 21b, the diagonal low rigidity portions 21d and 21e substantially corresponding to the rear low rigidity portion, the front low rigidity portion, and the diagonal low rigidity portion that are continuous in the vehicle width direction. Is formed.

  The hood grille 14 attached to the air scoop 13 of the bulge 12 bulging and formed on the outer panel 11 is annularly covered along the outer periphery of the air scoop 13 and is detachably locked to the air scoop 13 as shown in FIG. The hood grill main body 15 and the front part integrally formed with the hood main body 15 are stretched on the upper surface of the outer panel 11, and the rear end is inserted into the air scoop 13, near the rear edge of the central lateral bone 30 of the inner panel 11. Has a plate-like base 16 that reaches The front end 16 a of the base portion 16, more specifically, the connecting portion 17 between the outer panel 11 and the base portion 16 is behind the rear concave portion 35 formed in the inner panel 21 in a plan view and from the front portions of the oblique bones 24 and 25. Located behind. That is, the hood grill 15 is in a plan view and is located on the upper surface of the outer panel 11 between the rear low-rigidity portion 21a and the front low-rigidity portion 21b of the inner panel 21 and within the range behind the oblique low-rigidity portions 21d and 21e. It is attached.

  Next, the operation of the vehicle front hood structure configured as described above will be described.

  According to the front hood 10 configured as described above, the front panel 10 and the inner panel 21 are provided with a reinforcing structure having a hollow cross-sectional shape in which appropriate portions of the outer panel 11 and the inner panel 21 are bonded with an adhesive, and peripheral portions are integrally coupled by hemming. The front portion of the hood 10 is stiffened by the front standing bone 23 and the hood lock phosphorus hose 22 of the inner panel 21 formed by extending in the vehicle width direction, the rear edge is stiffened by the rear standing bone 26, and The central lateral bone 30 and the oblique vertebrae 36 and 37 that are stiffened by the side erected bones 24 and 25 along both side edges to ensure the surrounding rigidity and extend in the vehicle width direction at a substantially central position in the front-rear direction. Further, the central portion is stiffened by the annular sub-bones 31a to 31f, 38a to 38c, 39a to 39c and 41a and 41b. Rigid front hood 10 over the entire surface by can be ensured. By improving the rigidity of the front hood 10 over the entire surface, it is possible to prevent the front hood 10 from being shaken by the vibration of the vehicle body and the traveling wind accompanying the traveling.

  On the other hand, as shown in FIG. 2, when an excessive impact load P1 is applied from the front to the front center of the front hood 10, that is, the center of the front edge, the impact load P1 is mainly stiffened by the hood lock phosphorus hose 22. It is distributed and transmitted from the front erected bone 23 to the front part of the left and right side erected bones 24, 25, and is formed at the rear ends of the side erected bones 24, 25 via the left and right side erected bones 24, 25. It is transmitted to the hood hinge attaching portions 27 and 28, and is received by the vehicle body via the left and right hood hinges 51 attached to the hood hinge attaching portions 27 and 28, and the front center is retracted.

  As the front center retracts, the front hood 10 whose rear portion is received by the vehicle body via the hood hinge 51 is deformed and deformed at the center of the front end of the outer panel 11, and the front standing bone 23 of the inner panel 21 and The hood locklin hose 22 is pushed rearward, and the rear end edge side of the front standing bone 23 and the hood locklin hose 22 is pushed up.

  As the front erection 23 and the hood rock phosphorus hose 22 are retracted in the center in the vehicle width direction and pushed up on the rear edge side of the front erection 23, the continuous side along the rear edge central part of the front erection 23. A relatively low-rigidity front concave portion 34 that becomes the front central low-rigidity portion 21c of the formed inner panel 21 is bent and deformed into a U-shape protruding upward. Continuing from the deformation of the front concave portion 34, the rear concave portion 35 is bent upward in a U-shape. Due to the deformation of the continuous front recess 34 and rear recess 35, the impact energy is absorbed to reduce the impact, and the front standing bone 23 comes into contact with the front ends of the inclined standing bones 36 and 37.

  Between the front standing bone 23 and the sub standing bones 38a to 38c continuously formed in the front concave portion 34 starting from the bending deformation of the front concave portion 34 and the rear concave portion 35 forming the front central low-rigidity portion 21c, The front low rigidity portion 21b formed between the front standing bone 23 and the sub standing bones 39a to 39c continuously in the vehicle width direction is continuously directed from the front concave portion 34 toward the side standing bones 24 and 25. The inner panel 21 is sequentially bent and deformed, and the inner panel 21 is bent upwardly along the front low-rigidity portion 21b in a dogleg shape. Along with the bending of the front low rigidity portion 21b of the inner panel 21 starting from the front center low rigidity portion 21c, the front low rigidity portion starting from the portion facing the front center low rigidity portion 21c also in the outer panel 11 The part facing 21b is bent continuously successively.

  Impact energy is continuously absorbed by the bending deformation of the inner panel 21 and the outer panel 11. The front hood 10 whose rear end is supported by the vehicle body via the hood hinge 51 and whose front end is locked to the vehicle body via the hood lock device is changed from the normal state of FIG. 7A to FIG. 7B. As shown in the figure, it is pushed up along the front low-rigidity portion 21b and bent into a dogleg shape protruding upward.

  In the deformation of the front hood 10, the range of the outer panel 11 between the rear low-rigidity portion 21a and the front low-rigidity portion 21b to which the hood grille 15 is attached is prevented from being deformed or greatly suppressed, and the inner panel 21 and Combined with the fact that the impact energy is efficiently absorbed by the continuous bending deformation of the outer panel 11 and the impact is mitigated, the breakage of the hood grill 15 is effectively avoided.

  When an excessive impact load P1 is applied, the impact load P1 is stiffened by the hood locklin hose 22 as the front standing bone 23 and the hood locklin hose 22 are retracted in the center in the vehicle width direction. Further, it is transmitted from the both ends of the front erected bone 23 to the respective bead portions 24a and 25a formed on the side erected bones 24 and 25 through the front regions 24c and 25c of the left and right side erected bones 24 and 25. . Further, the side erected bones are interposed via left and right oblique vertebrae 36 and 37 whose front ends are in contact with the front erected bone 23 by bending deformation of the front side concave portion 34 and the rear side front concave portion 35 from the central portion of the front erected bone 23. The bead portions 24a and 25a of the bones 24 and 25 are transmitted to the front portions of the bead portions 24a and 25a, and are effectively transmitted to the bead portions 24a and 25b. It can be bent into a letter shape.

  A rear low-rigidity portion 21a whose rigidity is set relatively low between the central lateral bone 30 and the sub-vertical bones 31a to 31f in accordance with the bending deformation of the bead portions 24a and 25a of the side vertical bones 24 and 25. Are pushed up sequentially and bent into a dogleg shape, and the inner panel 21 is bent into a dogleg shape along the rear low-rigidity portion 21a over its entire width.

  As the rear low-rigidity portion 21a of the inner panel 21 is bent, a portion of the outer panel 11 that faces the rear low-rigidity portion 21a is sequentially bent. While the impact energy is continuously absorbed by the bending deformation of the inner panel 21 and the outer panel 11, the front hood 10 protrudes upward along the front low-rigidity portion 21b as shown in FIG. From the state of being bent into a U-shape, it is bent into a U-shape protruding upward along the rear low-rigidity portion 21a as shown in FIG.

  In the deformation of the front hood 10, the range of the outer panel 11 between the rear low-rigidity portion 21a and the front low-rigidity portion 21b to which the base 16 of the hood grille 15 is attached is prevented from being deformed or greatly suppressed, and can be attached and detached. The hood grill main body 15 that freely engages with the air scoop 13 of the bulge 12 is released from the air scoop 13 to release the restraint, and the impact energy is obtained in advance by bending deformation of the front low-rigidity portion 21b portion of the front hood 10. In combination with the fact that the shock acting on the hood grill 14 is absorbed and the impact acting on the hood grill 14 is mitigated, damage to the hood grill 15 can be avoided. Further, the impact energy is continuously absorbed by the bending deformation of the rear low-rigidity portion 10a of the continuous front hood 10, and the impact can be reduced.

  Furthermore, the front low-rigidity portion 21b and the rear low-rigidity portion 21a of the inner panel 21 of the front hood 10 and the corresponding lower panel 11 can be bent and deformed by the impact load P1. Occurrence of a situation in which the windshield 2 is pierced by the rear end of the supported front hood 10 can be prevented.

  Further, if an excessive impact load P2 is applied to the front hood 10 from the front center, for example, as shown in FIG. The front low-rigid portion 21b formed between the rear edge of the front standing bone 23 and the sub standing bones 28a to 28c and the front edge of the oblique standing bone 36 and the sub standing bone while being input to the standing bone 24 21d of slanting low-rigidity parts formed between 28a-28c are bend | folded in the shape of a dog-shape which protrudes upwards.

  As the front low-rigidity portion 21b and the oblique low-rigidity portion 21d are deformed, a portion of the outer panel 11 facing the front low-rigidity portion 21b and the oblique low-rigidity portion 21d is bent to absorb impact energy. Further, the front concave portion 34 and the rear concave portion 35 are bent in conjunction with the deformation of the front low-rigidity portion 21b and the oblique low-rigidity portion 21d, and the center portion of the front standing bone 23 and the front end of the inclined vertical bone 37 are in contact with each other. From the central part of the front erection 23 to the right side vertebra 25 via the oblique erection 37, the posterior side bones 24, 25 are posteriorly transmitted. It is transmitted to the hood hinge mounting portions 27 and 28 formed at the ends, and is received by the vehicle body main body via the left and right hood hinges 51.

  In the deformation of the front hood 10, the deformation of the portion of the outer panel 11 behind the slanted low rigidity portion 21d to which the hood grille 15 is attached is avoided or greatly suppressed, and the front low rigidity portion 21b of the inner panel 21 and the slanted portion are inclined. Combined with the fact that the impact energy is efficiently absorbed by the bending deformation of the corresponding portions of the low-rigidity portion 21d and the outer panel 11, damage to the hood grille 15 is effectively avoided.

  Further, when an excessive impact load P2 is applied, it is transmitted from the front region 24c of the side erected bone 24 to the bead portion 24a, and with the retraction of the front erected bone 23, It is transmitted to the bead portion 25a formed on the side erected bone 25 via the oblique erected bone 27 whose front end abuts on the center in the vehicle width direction, and the bead portions 24a and 25a formed with relatively low rigidity move upward. It can be folded into the shape of

  Along with the bending deformation of the bead portions 24a and 25a of the side erected bones 24 and 25, the rear low-rigidity portion 21a between the central lateral erected bone 30 and the sub erected bones 31a to 31f is successively shaped like a dogleg. Can be folded. As the rear low-rigidity portion 21a of the inner panel 21 is bent, a portion of the outer panel 11 that is opposed to the rear low-rigidity portion 21a is also successively bent, and a dogleg protruding upward along the rear low-rigidity portion 21a. Folded into a shape.

  In the deformation of the front hood 10, the deformation of the range of the outer panel 11 between the oblique low rigidity portions 21d and 21e to which the base portion 16 of the hood grill 15 is attached and the rear low rigidity portion 21a is avoided or greatly suppressed. The hood grill main body 15 that is detachably engaged with the air scoop 13 of the bulge 12 is released from the air scoop 13 to release the restraint, and the oblique low rigidity portion 10d and the front low rigidity portion 10b of the front hood 10 are preliminarily released. Combined with the fact that the impact energy is absorbed by the bending deformation and the impact acting on the hood grill 14 is reduced, the breakage of the hood grill 15 is effectively avoided.

  Further, the front panel low rigidity portion 21b, the slant low rigidity portions 21d and 21e and the rear low rigidity portion 21a of the inner panel 21 due to the impact load P2 and the corresponding deformation of the outer panel 11 can be secured, and the hood hinge 51 can be secured. Thus, it is possible to prevent the windshield 2 from being broken by the rear end of the front hood 10 supported by the vehicle body.

  Therefore, the impact load is distributed and transmitted to the left and right hood hinges 51 with respect to an excessive impact load acting from the front on the front center of the front hood 10 and the position offset from the front center, and the front hood is set in advance. The bending deformation in the ten low-rigidity parts is ensured. In addition, the impact energy is effectively absorbed by the continuous bending deformation in each low-rigidity part, and the impact can be efficiently mitigated, and the front hood 10 is received by the hood hinge 51 and the vehicle body body. The situation of breaking through the glass 2 is reliably prevented and safety can be ensured.

  In addition, since the low-rigidity portion where the front hood 10 is bent and deformed when an excessive impact load is applied is set forward and rearward from the joint portion between the hood grill 14 and the outer panel 21, the outer panel 11 to which the hood grill 15 is attached. In this range, the deformation is avoided or the deformation is extremely suppressed, and the situation where the hood grill 15 is damaged and the damaged hood grill 15 is scattered can be avoided.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the low rigidity part formed in the side erected bones 24 and 25 can be formed by drilling holes instead of the bead parts 24a and 25a.

1 is a front perspective view of a vehicle showing an embodiment of a vehicle front hood structure according to the present invention. It is a top view of the front hood seen from the arrow A direction in FIG. It is the perspective view which looked at the front hood from the lower part. It is the II sectional view taken on the line of FIG. It is the A section enlarged view of FIG. It is the B section enlarged view of FIG. It is operation | movement explanatory drawing of a front hood. It is a top view of the front hood which abbreviate | omitted the outer panel which shows the outline | summary of the conventional front hood structure for vehicles. It is the II-II sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Windshield 3 Car body main body 10 Front hood 11 Outer panel 12 Bulge 13 Air scoop 14 Hood grill 15 Hood grill main body 16 Base 21 Inner panel 21a Rear low-rigidity part 21b Front low-rigidity part 21c Front center low-rigidity part 22 Hood Rocklin hose 23 Front standing bone 24, 25 Side standing bone 24a, 25a Bead part (low rigidity part)
24b, 25b Rear range 24c, 25c Front range 26 Rear standing bone 27, 28 Hood hinge attachment portion 30 Central lateral bone 31a-31f Sub standing bone 34 Front recessed portion 35 Rear recessed portion 36, 37 Oblique standing bone 38a-38c Sub Standing bone 39a-39c Sub standing bone 41a, 41b Sub standing bone

Claims (6)

The outer panel and an inner panel stretched on the lower surface of the outer panel, both rear ends are mounted and supported on the vehicle body via hood hinges, and the front end is held on the vehicle body member by the hood lock device. In the vehicle front hood structure with a hood grill attached to the top surface,
The front hood includes a front low-rigidity portion extending in the vehicle width direction forward of the hood grille attachment portion and a rear low-rigidity portion extending rearward of the hood grille attachment portion in the vehicle width direction. A front hood structure for a vehicle characterized by comprising: The inner panel is
Left and right side standing bones formed to bulge downward along the both side edges of the inner panel, with the rear end supported by the vehicle body via a hood hinge;
An anterior eruption formed by bulging downward along the anterior edge and having both ends connected to the anterior end of each side erection,
A front low-rigidity portion that is formed to protrude toward the outer panel along the rear edge of the front standing bone;
The rear end is connected to the front-rear direction intermediate portion of the left and right side erected bones, and extends across the front end located in the vicinity of the center portion in the width direction of the front erected vehicle separating the front low rigidity portion from the connecting portion. Left and right oblique bones bulging downward,
A rear low-rigidity portion formed to extend in the vehicle width direction including a low-rigidity portion formed on the rear side of the connecting portion with each of the side erected bones and the oblique bone;
2. The front hood structure for a vehicle according to claim 1, wherein the hood grill is attached to an upper surface of the outer panel between the front low rigidity portion and the rear low rigidity portion. The inner panel has a slanted low rigidity portion that is formed to protrude toward the outer panel along the front edge of the oblique bone,
3. The vehicle front hood structure according to claim 2, wherein the hood grill is attached to the upper surface of the outer panel between the oblique low rigidity portion and the rear low rigidity portion. The inner panel has a front center low-rigidity portion that is formed to protrude toward the outer panel between the left and right oblique bone front ends,
4. The vehicle front hood structure according to claim 2, wherein the hood grill is attached to an upper surface of the outer panel between the front center low-rigidity portion and the rear low-rigidity portion.   The front center low-rigidity part includes a front recess formed to protrude toward the outer panel between the front ends of the left and right oblique vertebrae, and a rear side formed to protrude to the outer panel continuously in a step shape behind the front recess. The vehicle front hood structure according to claim 4, further comprising a recess. A hood lock phosphorus hose is provided between the outer panel and the inner panel along the front edge of the front hood, and the front low-rigidity portion is formed between the phosphorus hose and the hood grill. The vehicle front hood structure according to any one of claims 1 to 5.

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