JP4422749B2 - Front body structure - Google Patents

Description

  The present invention relates to a front vehicle body structure including a large dashboard upper portion extending forward from an upper end of a dashboard lower partitioning an engine room and a vehicle compartment.

  Patent Document 1 describes a front vehicle body structure in which a dashboard upper that separates an engine room and a vehicle compartment is formed, and left and right damper housings are formed in which left and right dampers are accommodated. This front body structure has one end of the dashboard upper connected to the left damper housing, the other end of the dashboard upper connected to the right damper housing, and parallel to the longitudinal direction of the dashboard upper and perpendicular to the longitudinal direction. By forming a drainage channel with a concave cross section before and after the dashboard upper, the strength of the dashboard upper is increased, and consequently the strength of the left and right damper housings is increased.

Japanese Patent Laying-Open No. 2006-213291 (paragraphs 0024-0025, FIGS. 1 and 3)

  As the performance of automobiles has improved in recent years, the number of devices that should be installed in the engine room has increased. For example, in a hybrid vehicle, in addition to the conventional engine, many motor-related electrical components are installed in the engine room. It is requested. Therefore, it is desired to effectively use the space below the dashboard upper.

However, conventionally, parts have not been suspended and fixed below the dashboard upper. Moreover, although the dashboard upper described in Patent Document 1 has enhanced rigidity (section modulus) by the drainage channel having a concave cross section, the weight that can be suspended below the dashboard upper is not so large. It is desired to further strengthen the rigidity of the dashboard upper.
In addition, a large dashboard upper may emit low-frequency noise called drumming noise due to resonance caused by vibration of the automobile, and suppression thereof is desired.

  The present invention has been made in view of such circumstances, and has a front vehicle body structure that can reduce noise and suspend and fix components installed in an engine room below a dashboard upper. The issue is to provide.

In the front vehicle body structure, the dashboard upper extends from the upper end of the dashboard lower toward the front, and the left and right ends of the dashboard upper are respectively joined to the damper housings arranged on the left and right of the engine room. A stiffener that extends to the left and right is fixed to an upper portion of the dashboard upper, and the stiffener includes a first horizontal bone that joins the upper portions of the damper housing and a second horizontal bone that extends to the left and right behind the first horizontal bone. And a plurality of longitudinal bones connecting the first transverse bone and the second transverse bone, and a drainage groove is formed along the left-right direction at the rear edge of the dashboard upper The second transverse bone is formed to form a closed section with the drainage groove .

According to this structure, the rigidity in the left-right direction of the dashboard upper is increased by the first horizontal bone and the second horizontal bone, and the rigidity in the front-rear direction of the dashboard upper is increased by the plurality of vertical bones. Therefore, since the rigidity of the dashboard upper is improved as a whole, it is possible to fix a heavy part that would be deformed by the conventional dashboard upper below the dashboard upper.
Further, since the rigidity and strength of the dashboard upper are increased, it becomes difficult to resonate with respect to low-frequency vibration, and drumming noise is reduced.
Moreover, according to this structure, since the closed cross section is formed by covering the upper part of the drainage groove with the second lateral bone, the rigidity is improved as compared with the case of the drainage groove alone (in the case of the open section). Therefore, the amount of deformation when a component to be installed in the engine room is suspended below the dashboard upper is reduced, and a heavier component than conventional can be suspended.

  Moreover, it is preferable that a flange is formed at the front end of the first transverse bone.

  According to this structure, bending rigidity can be easily imparted to the first transverse bone by the flange formed at the front end of the first transverse bone.

  Further, the front vehicle body structure according to the present invention has a structure in which components installed in the engine room are suspended and fixed from at least one of the dashboard upper and the stiffener from below the dashboard upper. Is preferred.

According to this structure, the space below the dashboard upper, which has conventionally been a dead space, can be used effectively. In addition, since a component to be installed in the engine room is fixed to at least one of the dashboard upper and the stiffener, the weight of the dashboard upper increases. Therefore, it becomes difficult to resonate with low-frequency vibration, and drumming noise can be reduced.
In addition, as a component installed in an engine room, heavy objects, such as an electrical component of a hybrid apparatus, are mentioned, for example.

  Moreover, it is preferable that the lower surface of the stiffener is formed with a concave groove that is recessed upward along the front-rear direction.

  According to such a structure, since the concave groove recessed upward is formed in the lower surface of the stiffener along the front-rear direction, the rainwater that has flowed into the upper surface of the dashboard upper is passed back and forth through the concave groove. Can flow in the direction. Therefore, even when a drainage groove is formed at the rear edge of the dashboard upper, rainwater that has flowed into the vicinity of the front end of the dashboard upper can flow into the drainage groove.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing noise, the front vehicle body structure which made it possible to suspend and fix the components installed in an engine room under a dashboard upper can be provided.

The best mode for carrying out the present invention will be described in detail with reference to the drawings. In the description, the same elements are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is a perspective view showing a front-side body of a vehicle having a front body structure according to the present embodiment. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along line BB in FIG. 4 is a cross-sectional view taken along the line CC of FIG. In the description, directions will be described based on front, rear, left and right and up and down viewed from a person seated in the driver's seat of the vehicle.

  As shown in FIGS. 1 and 2, the vehicle 1 includes upper members 2 and 2 that extend along the front-rear direction of the vehicle 1 on the left and right sides in front of the vehicle. Damper housings 3 and 3 for supporting a damper D (see FIG. 3) are provided near the rear of the upper members 2 and 2, respectively. A dashboard lower 4 (see FIG. 2) that partitions the engine room E and the vehicle compartment R is provided at the rear end of the engine room E of the vehicle 1. A dashboard upper 5 is installed at the upper end of the dashboard lower 4. The dashboard upper 5 extends in a plate shape from the upper end of the dashboard lower 4 toward the front of the vehicle 1, and its left and right ends (both sides) are the upper parts of the damper housings 3, 3 and the upper members 2. 2 is joined. A stiffener 6 for reinforcing the dashboard upper 5 is fixed to the upper portion of the dashboard upper 5. These members are joined to each other by, for example, spot welding or fillet welding.

  Incidentally, front pillars 7 and 7 are joined to the rear ends of the upper members 2 and 2, respectively. Further, front side frames 8 and 8 are respectively disposed along the longitudinal direction of the vehicle 1 obliquely below the upper members 2 and 2. The damper housings 3, 3 have upper ends joined to the upper members 2, 2 and lower ends joined to the front side frames 8, 8. A damper D (see FIG. 3) supported by the damper housings 3 and 3 is a device for attenuating tire vibration. A coil spring (not shown) for absorbing shock is attached to the damper D. An unsprung member (not shown) such as a tire is connected below the damper D and the coil spring. A windshield support 9 (see FIG. 2) is installed above the dashboard upper 5 so as to cover the dashboard upper 5 and the stiffener 6. The windshield support 9 supports the lower end of the windshield W.

As shown in FIG. 2 (see FIG. 1 as appropriate), the dashboard upper 5 is a substantially plate-shaped steel member extending from the upper end of the dashboard lower 4 toward the front of the vehicle. The dashboard upper 5 includes a bottom wall 51 and a peripheral wall 52 surrounding the bottom wall 51.
The bottom wall 51 includes a substantially horizontal horizontal portion 53 formed on the front end side, an inclined portion 54 that extends so as to become lower from the rear end of the horizontal portion 53 toward the rear, and a rear portion of the inclined portion 54. A drainage portion 55 extending rearward from the end. A drainage groove 56 having a concave cross section is formed along the left-right direction at the rear edge of the dashboard upper 5 by the drainage portion 55, the inclined portion 54, and the peripheral wall 52. Through holes 54a and 54a (see FIG. 1) for exposing the heads of the dampers D (see FIG. 3) are formed on the left and right sides of the inclined portion 54, respectively. The dashboard upper 5 is formed by press molding, for example.

  As shown in FIGS. 1 and 2, the stiffener 6 is a steel reinforcing member that extends in the left-right direction and is fixed to the upper portion of the dashboard upper 5. The stiffener 6 includes a first lateral bone 61 that joins the upper portions of the left and right damper housings 3, 3, a second lateral bone 62 that extends in the lateral direction behind the first lateral bone 61, and a first lateral bone A plurality of longitudinal bones 63, 63... Connecting the 61 and the second transverse bone 62. The stiffener 6 is integrally formed, for example, by press-molding a steel plate with a predetermined mold.

  The first transverse bone 61 extends along the left-right direction on the upper surface of the inclined portion 54 of the dashboard upper 5. A flange 61 a is bent at the front end of the first horizontal bone 61 so as to rise substantially perpendicular to the bottom wall 51. By this flange 61a, the bending rigidity in the left-right direction of the first transverse bone 61 is reinforced. The left and right end portions 61 b and 61 c of the first horizontal bone 61 are fixed to the upper portions of the damper housings 3 and 3 via the dashboard upper 5. The left and right ends 61b and 61c of the first horizontal bone 61 are formed in a Y shape in plan view and do not interfere with the head of the damper D and the mounting bolt (see FIG. 3) exposed from the through holes 54a and 54a. It is attached as follows.

  The second horizontal bone 62 extends in the left-right direction so as to cover the upper portion of the drainage portion 55 of the dashboard upper 5. The second horizontal bone 62 inclines away from the dashboard upper 5 toward the rear from the rear end of the vertical bone 63 and is substantially horizontal at the same height as the upper portion of the peripheral wall 52 on the rear side of the dashboard upper 5. It is formed to become. The rear end of the second horizontal bone 62 is fixed in a state of being sandwiched between the upper portion of the rear peripheral wall 52 and the rear end portion of the windshield support 9. That is, a closed cross section is formed by the drainage groove 56 and the second transverse bone 62 formed in a concave cross section. Thereby, the rigidity of the drainage groove 56 is strengthened. A plurality of through holes are formed in the second transverse bone 62 in order to reduce the weight of the member (see FIG. 1).

  A plurality of longitudinal bones 63 are formed along the front-rear direction, continuously from the rear end of the first transverse bone 61 and the front end of the second transverse bone 62. Between the vertical bones 63, a through hole 64 having a substantially rectangular shape in plan view with chamfered corners is formed. A flange 64 a is provided around each through hole 64. Among the flanges 64a, the longitudinal rigidity of the longitudinal bone 63 is reinforced by the flanges 64a along the front-rear direction. The longitudinal bone 63 is coupled to the upper surface of the dashboard upper 5 by spot welding, for example.

As shown in FIG. 2, a relatively heavy component (hereinafter referred to as “heavy object 11”) is attached below the dashboard upper 5, such as an electrical component of a hybrid device. . The heavy object 11 is suspended and fixed to the dashboard upper 5 and the stiffener 6 via the fixing tool 12 and the bracket 13. As the fixing tool 12, for example, a bolt and a nut can be used.
The parts to be suspended and fixed below the dashboard upper 5 are not limited to the electrical parts of the hybrid device, and may be appropriately selected from the parts and devices installed in the engine room E.

  As shown in FIGS. 3 and 4, a plurality of concave grooves 65 that are recessed upward along the front-rear direction are formed on the lower surface of the stiffener 6 at intervals. The concave groove 65 is mainly formed before and after the through hole 64 in the first transverse bone 61 and the second transverse bone 62. The concave grooves 65 formed in each of the first horizontal bone 61 and the second horizontal bone 62 communicate with each other through a through hole 64. That is, a gap communicating in the front-rear direction is formed between the upper surface of the dashboard upper 5 and the lower surface of the stiffener 6 by the concave grooves 65, 65. The gap serves as a flow path for guiding rainwater or the like that has entered the upper surface of the dashboard upper 5 to a drain groove 56 formed at the rear edge of the dashboard upper 5 (see FIG. 4). The concave groove 65 is formed, for example, by bending (press molding) a steel plate constituting the stiffener 6 so that the upper surface is convex and the lower surface is concave.

  Incidentally, as shown in FIG. 3, a damper D is installed inside the damper housing 3. On the top of the damper D, a damper mounting bracket D1 is provided. The damper D is fixed by fastening a nut to a bolt D2 penetrating the damper mounting bracket D1, the damper housing 3, and the dashboard upper 5.

It continues and demonstrates the effect of the front vehicle body structure which concerns on this embodiment.
According to the present embodiment, the rigidity of the dashboard upper 5 in the left-right direction is increased by the first horizontal bone 61 and the second horizontal bone 62, and the rigidity in the front-rear direction of the dashboard upper 5 is increased by the plurality of vertical bones 63. Will be. Therefore, since the rigidity of the dashboard upper 5 is improved as a whole, it is possible to fix a heavy part that is deformed by the conventional dashboard upper below the dashboard upper 5.
In particular, the first horizontal bone 61 is spanned so as to connect the left and right damper housings 3 and 3 and has a flange 61a at the front end, so that it has a beam-like structure, improved rigidity, and a heavy load. 11 can be fixed.
Further, since the closed cross section is formed by the second transverse bone 62 and the drainage groove 56, the rigidity is further improved.

Further, since the stiffness and strength of the dashboard upper 5 are enhanced by the stiffener 6, it becomes difficult to resonate with respect to low-frequency vibration, and drumming noise is reduced. In particular, by forming a plurality of vertical bones 63 and joining to the dashboard upper 5, the rigidity of the dashboard upper 5 in the front-rear direction is improved and noise is reduced.
Further, by fixing the heavy object 11 below the dashboard upper 5, the weight of the support members (dashboard upper 5 and windshield support 9) supporting the lower part of the windshield W increases, so that low-frequency resonance is achieved. Is prevented and drumming noise is reduced.

  In addition, since a concave groove 65 is formed on the lower surface of the stiffener 6, rainwater or the like that enters the upper surface of the dashboard upper 5 Can lead. Further, since the water flow is not blocked, the dashboard upper 5 and the stiffener 6 are not easily rusted. Therefore, rust prevention performance improves.

  The best mode for carrying out the present invention has been described in detail with reference to the drawings. However, the present invention is not limited to the embodiment, and may be appropriately changed without departing from the gist of the present invention. Is possible.

  For example, in the present embodiment, the left and right ends of the dashboard upper 5 are directly coupled to the upper surfaces of the damper housings 3 and 3, but the coupling members such as gussets (not shown) are not directly coupled to the upper surfaces of the damper housings 3 and 3. ).

  In the present embodiment, the heavy object 11 is suspended and fixed to the dashboard upper 5 and the stiffener 6 from below the dashboard upper 5 using bolts and nuts. For example, the bracket 13 may be fixed to the lower surface of the dashboard upper 5 by welding or the like, and the heavy object 11 may be suspended and fixed via the bracket 13.

  Further, for example, a groove (bead) for collecting rainwater in the concave groove 65 may be formed on the upper surface of the horizontal portion 53.

It is a perspective view which shows the body of the front side of the vehicle which has the front vehicle body structure which concerns on this embodiment. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 3 Damper housing 4 Dashboard lower 5 Dashboard upper 6 Stiffener 11 Heavy article 56 Drainage groove 61 1st horizontal bone 61a Flange 62 2nd horizontal bone 63 Vertical bone 65 Concave groove

Claims (4)

In the front vehicle body structure in which the dashboard upper extends from the upper end of the dashboard lower toward the front, and the left and right ends of the dashboard upper are respectively joined to the damper housings arranged on the left and right of the engine room,
Stiffeners extending left and right are fixed to the upper part of the dashboard upper,
The stiffener couples a first transverse bone that joins the upper parts of the damper housing, a second transverse bone that extends laterally behind the first transverse bone, and the first transverse bone and the second transverse bone. Is formed integrally with a plurality of longitudinal bones ,
A drainage groove is formed along the left-right direction at the rear edge of the dashboard upper,
The front vehicle body structure characterized in that the second transverse bone forms a closed cross section with the drainage groove . The front vehicle body structure according to claim 1, wherein a flange is formed at a front end of the first transverse bone. Wherein in at least one of the upper dashboard member and the stiffener, the parts to be installed in the engine room, according to claim 1 or claim 2, characterized in that said hanging fixed from below the dashboard upper Front body structure. The front vehicle body structure according to any one of claims 1 to 3 , wherein a concave groove that is recessed upward is formed in a lower surface of the stiffener along a front-rear direction. .

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