JP2019034601A - Vehicle front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle front structure for suppressing a retreat amount of a front pillar at the time of a minute lap collision. SOLUTION: A cowl top panel 10, a cowl top side panel 12, a bulkhead 16 (front pillar 14), and a door belt line reinforce 18 arranged in a straight line when viewed from the outside in the vehicle width direction are used for minute laps. The collision load of the front pillar 14 is efficiently transmitted to the rear side of the vehicle. In particular, since the bulkhead 16 arranged in the closed cross section of the front pillar 14 and the cowl top side panel 12 are directly joined, the load can be transmitted more efficiently. Therefore, it is possible to suppress the cross-sectional collapse of the front pillar at the time of a minute lap collision and suppress the amount of retreat of the front pillar 14 to the rear of the vehicle. [Selection diagram] Fig. 1

Description

  The present invention relates to a vehicle front structure.

  Conventionally, from the viewpoint of preventing the front pillar from collapsing in the frontal collision of the vehicle, the upper member rein hose located on the front side of the front pillar, the bulkhead disposed in the front pillar closed cross section, and the beltline rein hose The thing arrange | positioned so that it may mutually oppose is proposed (refer patent document 1). In particular, the front end portion of the ridge line formed by the vertical wall portion of the rein hose and the flange portion is disposed close to the vehicle outer ridge line of the upper member, and the rear end portion is disposed so as to face the step portion of the bulkhead. It is said that the load transmitted outside the vehicle is efficiently transmitted from the upper member to the door belt line rein hose through the rein hose and the stepped portion of the bulkhead.

JP 2011-162103 A

  When the vehicle having the vehicle front structure described in Patent Document 1 has a minute lap collision (front collision only on the outer side in the vehicle width direction of the front side member), the outer side of the upper member is deformed, and the bulkhead of the front pillar is efficiently There was a risk that the load could not be transmitted. Thereby, there is a possibility that the amount of retreat of the front pillar due to the collapse of the cross section of the front pillar cannot be effectively suppressed. That is, there is room for improvement in terms of suppressing the amount of retraction of the front pillar at the time of a minute lap collision.

  An object of the present invention is to provide a vehicle front structure that suppresses the retraction amount of the front pillar at the time of a minute lap collision in consideration of the above fact.

  The vehicle front portion structure according to claim 1 is coupled to the cowl top panel at a vehicle width direction both ends of the cowl top panel extending in the vehicle width direction along the lower end portion of the windshield glass. The closed cowl top side panel, a front pillar having a closed cross-sectional structure that is located on the vehicle rear side of the cowl top side panel and extends in the vehicle vertical direction, and the closed cross section is partitioned within the closed cross section of the front pillar. A bulkhead coupled to the cowl top side panel, and a door belt line reinforcement disposed in the vehicle front-rear direction along the belt line of the front side door, the cowl top The panel, the cowl top side panel, the bulkhead, and the door belt line reinforcement It is disposed on a straight line when viewed from the direction outside.

  In the vehicle front structure according to the first aspect, when the vehicle collides minutely, a collision load is input to the cowl top side panel from the outside in the vehicle width direction of the cowl top panel. A part of this collision load is transmitted to the bulk head directly coupled to the cowl top side panel, and is transmitted from the park head (front pillar) to the door belt line reinforcement located on the vehicle rear side.

  Here, the cowl top panel, the cowl top side panel, the bulkhead, and the door belt line reinforcement are arranged in a straight line when viewed from the outside in the vehicle width direction, so the cowl top panel, the cowl top side panel, the bulkhead, and the door. The collision load at the time of minute lap is efficiently transmitted to the vehicle rear side of the front pillar through the beltline reinforcement path.

  Here, “on a straight line” means that the upper surface of the cowl top panel is located between the upper and lower ends of the cowl top side panel, the bulkhead, and the door belt line reinforcement as viewed from the outside in the vehicle width direction. .

  In addition, since the bulkhead disposed in the closed cross section of the front pillar and the cowl top side panel are directly coupled, the bulkhead that has high strength in the front pillar is able to apply the collision load transmitted to the cowl top side panel. To be transmitted efficiently.

  In this way, during a small lap collision, the collision load transmitted from the cowl top panel to the cowl top side panel is efficiently transmitted to the door belt line reinforcement via the bulkhead where the cowl top side panel is directly joined. The

  Therefore, the front pillar is prevented from being broken in cross section, and the retreat amount of the front pillar is suppressed.

  According to the first aspect of the present invention, the amount of retraction of the front pillar can be effectively suppressed during a minute lap collision.

It is the side view seen from the vehicle width direction outside which shows the vehicle front part structure concerning this embodiment. It is a principal part enlarged view of FIG. It is the sectional view on the AA line of FIG. It is a graph which shows the relationship between the load and stroke which are input into the front pillar which concerns on a comparative example and an Example.

  A vehicle front structure according to an embodiment will be described with reference to FIGS. In each figure, the arrow FR indicates the front of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow OUT indicates the outer side in the vehicle width direction. In FIG. 1 and FIG. 2, the front pillar outer panel is not shown for convenience of explanation. Moreover, the x mark in FIG. 3 shows a welding hit point.

(Constitution)
As shown in FIG. 1, the vehicle front structure includes a cowl top panel 10 extending in the vehicle width direction along the lower end of the windshield glass, and a cowl top that supports both ends of the cowl top panel 10 in the vehicle width direction. Side panel 12, front pillar 14 positioned on the vehicle rear side of cowl top side panel 12, bulkhead 16 set inside the cross section of front pillar 14, and door belt set inside a front side door (not shown) Line reinforcement 18.

  The cowl top panel 10 is joined to the cowl top side panel 12 at the vehicle rear end side at both ends in the vehicle width direction.

  Further, the upper surface 20 of the cowl top panel 10 extends from the front end of the vehicle to the rear of the vehicle, and is an inclined surface 20A that is inclined upward toward the upper surface 21 of the cowl top side panel 12 on the rear side of the vehicle. Yes.

  The cowl top side panel 12 is formed so as to extend in the vehicle vertical direction, and is joined to the rear ends of both ends of the cowl top panel 10 in the vehicle width direction. A rear extension 22 that is joined to the bulkhead 16 extends toward the upper rear side of the vehicle at the upper end of the cowl top side panel 12. The upper surface 21 of the cowl top side panel 12 is also inclined upward in the vehicle toward the vehicle rear side toward the upper end of the bulkhead 16.

  As shown in FIG. 3, the front pillar 14 includes a front pillar outer panel 24, a front pillar inner panel 26, a front pillar reinforcement 28, and a bulkhead 16.

  As shown in FIG. 3, the front pillar outer panel 24 has a hat shape in cross section, a top wall 30 that extends in the vehicle front-rear direction, and a side wall that extends inward in the vehicle width direction from the vehicle front-rear direction end of the top wall 30. 32, 34 and flange portions 36, 38 extending from the vehicle width direction inner side end portions of the side walls 32, 34 to the vehicle front side and the vehicle rear side, respectively.

  As shown in FIG. 3, the front pillar inner panel 26 has a substantially hat-shaped cross section, and has a top wall 40 extending in the vehicle front-rear direction and a cross-sectional hat shape at the vehicle front side end portion of the top wall 40 in the vehicle width direction. A bulging portion 42 that protrudes inward, a flange portion 44 that extends forward from the vehicle front side end portion of the bulging portion 42, and a vehicle rear side end portion of the top wall 40 that extends outward in the vehicle width direction. The side wall 46 which exists, and the flange part 48 extended from the vehicle width direction outer side edge part of the side wall 46 to the vehicle rear are provided.

  Therefore, the flange portions 36 and 38 and the flange portions 44 and 48 of the front pillar inner panel 26 are joined to the front pillar outer panel 24 to form a substantially rectangular closed cross section.

  Within this closed cross section, a front pillar reinforcement 28 is disposed along the front pillar outer panel 24 in the vehicle vertical direction. As shown in FIG. 3, the front pillar reinforcement 28 has a hat shape in cross section, and extends from the vehicle front side end portion of the top wall 50 in an inward direction in the vehicle width direction. An inclined wall 52, a flange portion 54 extending inward in the vehicle width direction from the inner end portion in the vehicle width direction of the inclined wall 52, and a side wall extending inward in the vehicle width direction from the vehicle rear side end portion of the top wall 50. 56 and a flange portion 58 extending rearward from the inner end of the side wall 56 in the vehicle width direction.

  The flange portion 54 is joined to the side wall 32 of the front pillar outer panel 24. Further, the flange portion 58 is laminated and joined to the flange portion 38 of the front pillar outer panel 24 and the flange portion 48 of the front pillar inner panel 26. Thus, the front pillar reinforcement 28 is disposed along the front pillar outer panel 24 within the closed cross section.

  As shown in FIGS. 2 and 3, the front pillar reinforcement 28 is formed with a rectangular hole 60 on the vehicle front side in the vicinity of the vehicle upper side end.

  A bulkhead 16 is set on the inner side in the vehicle width direction of the front pillar reinforcement 28 in the closed cross section of the front pillar 14. The bulkhead 16 is formed in a cross-sectional hat shape that protrudes inward in the vehicle width direction when viewed from the front of the vehicle. As shown in FIG. 2 (see the broken line portion), the bulkhead 16 includes a top wall 62 that extends in the vehicle vertical direction, Side walls 64 and 66 extending outward in the vehicle width direction from the upper and lower ends of the wall 62, and flange portions 68 and 70 extending from the outer end in the vehicle width direction of the side walls 64 and 66 to the upper and lower sides of the vehicle, respectively. Have The top wall 62 is joined to the top wall 40 of the front pillar inner panel 26. Further, the flange portions 68 and 70 are joined to the top wall 50 of the front pillar reinforcement 28. Thereby, the bulkhead 16 partitions the closed cross section of the front pillar 14.

  As shown in FIG. 3, the flange portion 68 includes a first bulging portion 72 that protrudes outward in the vehicle width direction on the front side of the vehicle, and an outer side in the vehicle width direction on the vehicle rear side of the first bulging portion 72. A projectingly formed second bulging portion 74. The first bulging portion 72 includes a top wall 76 that extends in the vehicle front-rear direction, an inclined wall 78 that is inclined from the vehicle front side end portion of the top wall 76 to the vehicle front inner side, and a vehicle having a top wall 76. And an inclined wall 80 formed to incline from the rear side end portion toward the vehicle rear inner side.

  The second bulging portion 74 is also configured to have a top wall 82 and inclined walls 84, 86 in substantially the same manner as the first bulging portion 72, but the top wall 82 is located on the inner side in the vehicle width direction than the top wall 76. To do. That is, the second bulging portion 74 has a smaller amount of protrusion outward in the vehicle width direction than the first bulging portion 72.

  Therefore, as shown in FIG. 3, by joining the top wall 82 of the second bulge portion 74 to the top wall 50 of the front pillar reinforcement 28, the first bulge portion 72 is removed from the hole 60 of the front pillar reinforcement 28. It protrudes outward in the vehicle width direction, and the top wall 76 abuts against the top wall 30 of the front pillar outer panel 24 from the inner side in the vehicle width direction.

  As shown in FIG. 3, a flange portion 88 (see FIG. 2) formed on the vehicle rear end side of the rear extension portion 22 of the cowl top side panel 12 is provided outside the top wall 30 in the vehicle width direction. Abutted.

  That is, the top wall 76 of the bulkhead 16, the top wall 30 of the front pillar outer panel 24, and the flange portion 88 of the cowl top side panel 12 are laminated and joined.

  Next, on the vehicle rear side of the bulkhead 16 of the front pillar 14, as shown in FIG. 1, a door belt line reinforcement 18 installed on the belt line of the front side door extends in the vehicle front-rear direction. . As shown in FIG. 1, the door belt line reinforcement 18 is disposed substantially in line with the bulkhead 16.

  That is, the upper surface 20 of the cowl top panel 10, the upper surface 21 of the cowl top side panel 12, the bulkhead 16, and the upper ends of the door belt line reinforcement 18 are arranged at substantially the same height.

  In other words, the cowl top panel 10, the cowl top side panel 12, the bulkhead 16, and the door belt line reinforcement 18 are arranged on a straight line when viewed from the outside in the vehicle width direction.

  Here, “on a straight line” means that the upper surface 20 of the cowl top panel 10 is located between the upper and lower ends of the cowl top side panel 12, the bulkhead 16, and the door belt line reinforcement 18 when viewed from the outside in the vehicle width direction. It means doing.

  In addition, when an excessive load is input to the door belt line reinforcement 18 from the front of the vehicle, the door belt line reinforcement 18 is set to be folded outward in the vehicle width direction.

(Function)
Next, the operation of the vehicle front structure thus formed will be described.

  At the time of a minute lap collision of the vehicle (front collision of the front side member only in the vehicle width direction outer side), the collision load is transmitted from the outer end portion in the vehicle width direction of the cowl top panel 10 to the cowl top side panel 12.

  Since the cowl top side panel 12 is joined to the front pillar 14, a collision load is transmitted to the front pillar 14.

  At this time, since the flange portion 88 of the rear extension 22 of the cowl top side panel 12 is directly joined to the top wall 76 of the bulkhead 16 of the front pillar 14, the collision load is transferred from the cowl top side panel 12 to the bulkhead. 16 is quickly transmitted to the door belt line reinforcement 18 disposed on the vehicle rear side of the bulkhead 16.

  Here, in the vehicle front part structure of the present embodiment, the hole 60 is provided in the top wall of the front pillar reinforcement 28 in the front pillar 14, and the first bulging part 72 of the bulkhead 16 extends from the hole 60 to the vehicle width. Since it protrudes outward in the direction, a three-layer structure including the bulkhead 16, the front pillar outer panel 24, and the cowl top side panel 12 from which the front pillar reinforcement 28 is removed is made possible. That is, the bulkhead 16, the front pillar outer panel 24, and the cowl top side panel 12 can be joined by a welding gun.

  Thereby, the collision load is directly transmitted from the cowl top side panel 12 to the bulkhead 16. In particular, since the collision load is directly transmitted from the cowl top side panel 12 to the bulkhead 16 having high strength in the front pillar 14, the cross-sectional deformation of the front pillar 14 due to the input of the collision load is suppressed.

  As shown in FIG. 4, the front pillar reinforcement 28 does not have a hole 60, and the bulkhead 16 and the cowl top side panel 12 are not directly joined to each other. About the vehicle front part structure (Example) which concerns, the relationship between the load amount which acts on the front pillar 14 at the time of a micro lap collision, and the reverse | retreat amount (stroke) was confirmed.

  As compared with the comparative example in which the amount of retraction of the front pillar 14 increases as the load is increased, in the example, it was confirmed that when the load exceeds a predetermined load, the increase in the amount of retraction with respect to the load change is suppressed. .

  Further, since the cowl top panel 10, the cowl top side panel 12, the bulkhead 16, and the door belt line reinforcement 18 are arranged in a straight line, the cowl top panel 10 is transmitted to the cowl top side panel 12 at the time of a minute lap collision. The collision load is transmitted to the bulkhead 16 and the door belt line reinforcement 18 more efficiently.

  As described above, in the vehicle front structure according to the present embodiment, the collision load is directly transmitted from the cowl top side panel 12 to the bulkhead 16 having high strength in the front pillar 14, and the door belt line reinforcement 18 positioned at the rear of the vehicle. The collision load is efficiently transmitted to the.

  As a result, the collapse of the cross section of the front pillar 14 due to the minute lap collision is suppressed, and the amount of backward movement of the front pillar 14 to the rear of the vehicle is effectively suppressed.

  Furthermore, even when an excessive load is input to the door belt line reinforcement 18 via the bulkhead 16 at the time of a minute wrap collision, the door belt line reinforcement 18 is set to be bent and deformed outward in the vehicle width direction. Therefore, the opening of the front side door is secured.

(Other)
In the vehicle front structure according to this embodiment, the bulkhead 16 and the cowl top side panel 12 are directly joined, but the present invention is not limited to this. As long as both are directly coupled, fastening or the like may be used.

  Further, in the present embodiment, the front pillar reinforcement 28 is provided with the hole 60, and the bulkhead 16 and the cowl top side panel 12 are joined by projecting the first bulging portion 72 of the bulkhead 16 outward in the vehicle width direction. However, it may be directly joined by other methods.

10 cowl top panel 12 cowl top side panel 14 front pillar 16 bulkhead 18 door belt line reinforcement

Claims (1)

A cowl top panel extending in the vehicle width direction along the lower end of the windshield glass;
A cowl top side panel coupled to the cowl top panel at both ends in the vehicle width direction of the cowl top panel;
A front pillar having a closed cross-sectional structure located on the vehicle rear side of the cowl top side panel and extending in the vehicle vertical direction;
A bulkhead disposed to partition the closed cross section within the closed cross section of the front pillar and coupled to the cowl top side panel;
Door belt line reinforcement disposed in the vehicle longitudinal direction along the belt line of the front side door;
The cowl top panel, the cowl top side panel, the bulkhead, and the door belt line reinforcement are arranged in a straight line when viewed from the outside in the vehicle width direction.