JP2013112133A - Vehicle door structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle door structure in which a side door can be opened even under a large collision load.SOLUTION: At an outdoor side of an upper end of a door inner panel 42 of a front side door 24, a belt line reinforcement 48 is disposed along a belt line. The belt line reinforcement 48 is molded by hot stamping and a rear end 60 and a front end are formed to have lower strength and lower rigidity than a body 56. At a front collision, if the rear end 60 of the belt line reinforcement 48 receives a reaction force from a center pillar 14 to a vehicle front side, the rear end 60 is deformed plastically, thereby increasing the area of an abutment surface with the center pillar 14 via the door inner panel 42.

Description

  The present invention relates to a vehicle door structure.

  Patent Document 1 below discloses a belt line reinforcement disposed along a belt line in a front side door. In this belt line reinforcement, the shape of the front end portion is formed in an arc shape when viewed from the side of the vehicle. In this way, the magnitude of the input load per unit area is reduced by extending the contact surface with the front pillar to be deformed into an arcuate shape at the time of a frontal collision over the entire upper and lower portions of the front end portion.

JP 2009-120011 A

  However, according to the above prior art, the belt line reinforcement is firmly constituted by the reinforcing inner panel and the reinforcing outer panel. For this reason, when the collision load is large, it is conceivable that the front and rear ends of the beltline reinforcement bite into the front pillar and the center pillar, and the front side door is difficult to open.

  An object of the present invention is to obtain a vehicle door structure that allows the side door to be opened even when the collision load is large in consideration of the above facts.

  According to a first aspect of the present invention, there is provided a door structure for a vehicle according to the present invention, wherein a door main body portion is disposed between a front pillar and a center pillar, and includes a door outer panel and a door inner panel, and a belt line in the door main body portion. The belt inner reinforcement is disposed along the belt line reinforcement and the rear end of the belt line reinforcement is plastically deformed by receiving a load from the front pillar toward the rear side of the vehicle. And a rear deformation portion that increases an area of a contact surface with the center pillar via the panel.

  A vehicle door structure according to a second aspect of the present invention is the vehicle door structure according to the first aspect of the present invention, wherein the vehicle door structure is further set at a front end of the beltline reinforcement and receives a load from the front pillar toward the vehicle rear side. The front side deformation | transformation part which plastically deforms and increases the area of the contact surface with the front pillar via the said door inner panel is provided.

  The vehicle door structure according to a third aspect of the present invention is the vehicle door structure according to the first or second aspect, wherein the vertical width of the rear end portion of the beltline reinforcement is the vertical width of the main body portion of the beltline reinforcement. In addition to the upper edge flange portion provided on the upper edge side and the lower edge flange portion provided on the lower edge side, the belt line reinforcement is also attached to the door inner panel at the rear end portion. Spot welded.

  According to the first aspect of the present invention, the collision load at the time of frontal collision is transmitted to the front pillar via the front part of the vehicle body. For this reason, the front pillar is pushed toward the rear side of the vehicle, and the door main body is pushed against the center pillar. Thereby, the collision load at the time of frontal collision is transmitted from the front pillar to the center pillar via the belt line reinforcement of the door main body, and further transmitted from the center pillar to the rear side of the vehicle body.

  By the way, when the door main body comes into contact with the center pillar, a collision reaction force from the center pillar is input to the door main body. For this reason, the rear-end part of beltline reinforcement is pressed to the vehicle front side via a door inner panel. Here, in the present invention, since the rear deformation portion is set at the rear end portion of the beltline reinforcement, a load from the front pillar to the vehicle rear side is input, and the vehicle is applied to the rear end portion of the beltline reinforcement. When the collision reaction force to the front side is input, the rear side deformation portion provided at the rear end portion is plastically deformed. Thereby, the energy at the initial stage of the collision is absorbed. Furthermore, when the rear deformation portion is plastically deformed by the collision reaction force from the center pillar, the rear deformation portion is plastically deformed so that the area of the contact surface with the center pillar via the door inner panel is increased. . For this reason, the collision load input to the center pillar is dispersed by the increase in the area of the contact surface, and local deformation of the center pillar is suppressed. As a result, it is solved that the rear end portion of the beltline reinforcement bites into the center pillar and the opening operation of the vehicle door becomes impossible.

  According to this invention of Claim 2, the front side deformation | transformation part of the structure similar to a rear side deformation | transformation part is provided in the front-end part of the beltline reinforcement. For this reason, the effect | action similar to a rear-end part side is acquired also at the front-end part side with a beltline reinforcement. That is, when the door main body is sandwiched between the front pillar and the center pillar, the front deformation portion provided at the front end portion of the beltline reinforcement is plastically deformed to absorb energy at the beginning of the collision. In addition, the area of the contact surface with the front pillar at the front end portion of the beltline reinforcement via the door inner panel increases due to plastic deformation of the front deformation portion. Therefore, local deformation of the front pillar due to the front end portion of the beltline reinforcement biting into the front pillar is suppressed or prevented.

  According to the third aspect of the present invention, the vertical width of the rear end portion of the belt line reinforcement is set wider than the vertical width of the main body portion of the belt line reinforcement. It becomes possible to use. In the present invention, the beltline reinforcement is spot-welded to the door inner panel at the rear end portion in addition to the upper edge flange portion provided on the upper edge side and the lower edge flange portion provided on the lower edge side. The For this reason, compared with the structure which does not weld a rear-end part to a door inner panel, the joint strength with respect to the door inner panel of the rear-end part of beltline reinforcement can be raised.

  As described above, the vehicle door structure according to the first aspect of the present invention has an excellent effect of enabling the side door to be opened even when the collision load is large.

  The vehicle door structure according to the second aspect of the present invention has an excellent effect that not only local deformation of the center pillar but also local deformation of the front pillar can be suppressed.

  The vehicle door structure according to the third aspect of the present invention has an excellent effect that the rear end portion of the beltline reinforcement can be firmly fixed to the door inner panel.

It is a longitudinal cross-sectional view along the 1-1 line | wire of FIG. 4 which shows the principal part of the vehicle door structure which concerns on this embodiment. It is a cross-sectional view along the 2-2 line of FIG. 4 which shows the principal part of the vehicle door structure which concerns on this embodiment. (A) is an enlarged perspective view showing the beltline reinforcement shown in FIG. 1 as a single unit, and (B) to (D) are longitudinal sectional views showing sectional shapes when cut along each sectional line. . It is a side view which shows the periphery structure of the front side door of the vehicle to which the vehicle door structure which concerns on this embodiment was applied. 1 is a schematic side view of a vehicle to which a vehicle door structure according to an embodiment is applied. It is explanatory drawing which shows the state before shaping | molding of the beltline reinforcement shown by FIG. (A) is a principal enlarged plane sectional view showing a state of deformation at the time of frontal collision in the case of comparison, and (B) is a principally enlarged plane showing a state of deformation at the time of frontal collision in the present embodiment. It is sectional drawing. It is a perspective view corresponding to Drawing 3 (A) showing beltline reinforcement concerning the 1st modification. It is a perspective view corresponding to Drawing 3 (A) showing beltline reinforcement concerning the 2nd modification.

  Hereinafter, an embodiment of a vehicle door structure according to the present invention will be described with reference to FIGS. Note that an arrow FR appropriately shown in each figure indicates the vehicle front side, and an arrow UP indicates the vehicle upper side. Furthermore, the arrow IN indicates the inner side in the vehicle width direction.

  FIG. 5 shows a schematic side view of a four-door sedan vehicle. FIG. 4 is a schematic side view of the vehicle body side portion with the side door of the vehicle removed. As shown in these drawings, a front pillar 12, a center pillar 14, and a rear pillar 16 are erected on the vehicle side portion 10 in this order from the vehicle front side. The front pillar 12, the center pillar 14, and the rear pillar 16 are columnar vehicle body skeleton members that are erected substantially along the vehicle vertical direction.

  As shown in FIG. 4, the upper ends of the front pillar 12 and the center pillar 14 are coupled to roof side rails 18 that are disposed along the vehicle front-rear direction on both sides of the vehicle roof portion in the vehicle width direction. . The lower ends of the front pillar 12 and the center pillar 14 are coupled to rockers 20 disposed along the vehicle front-rear direction on both sides of the vehicle floor in the vehicle width direction. Accordingly, a substantially rectangular front door opening 22 surrounded by the front pillar 12, the center pillar 14, the roof side rail 18, and the rocker 20 is formed on the front side of the center of the vehicle side portion 10. The door opening 22 is opened and closed by the front side door 24. Similarly, a substantially rectangular rear door opening 26 surrounded by the center pillar 14, the rear pillar 16, the roof side rail 18 and the rocker 20 is formed on the rear side of the central portion of the vehicle side portion 10. The rear door opening 26 is opened and closed by a rear side door 28 (see FIG. 5).

  As shown in FIG. 2, the front pillar 12 includes a front pillar inner panel 30 and a front pillar outer panel 32 each having a flat cross-sectional shape. And each front side flange part and back side flange parts are overlapped and joined, and it is comprised in the closed cross-section structure. Similarly, the center pillar 14 includes a center pillar inner panel 34 and a center pillar outer panel 36 each having a flat cross-sectional shape that is a hat shape. And each front side flange part and back side flange parts are overlapped and joined, and it is comprised in the closed cross-section structure.

  A front side door 24 as a vehicle door is disposed between the front pillar 12 and the center pillar 14 described above. As shown in FIGS. 1 and 2, the front side door 24 includes a door outer panel 40 that is disposed outside the vehicle compartment and forms a door outer plate, and a door inner that is disposed on the vehicle interior side and forms a door inner plate. And a door main body portion 44 including the panel 42. The terminal portion of the door outer panel 40 is folded back to the terminal portion of the door inner panel 42 by a hemming process, whereby both are integrated to form a bag-like door main body 44. A door glass 70 (see FIG. 5) is accommodated in the door main body 44. The door glass 70 moves up and down along a door frame 46 (see FIG. 5) having a lower end attached to the door main body 44.

  Here, a long belt line reinforcement 48 extends along the belt line 50 (see FIG. 4) in the door main body 44 described above, more specifically, on the outer side of the passenger compartment at the upper end of the door inner panel 42. Arranged. As shown in an enlarged view in FIG. 3A, the beltline reinforcement 48 is formed of a long steel plate having a longitudinal cross-sectional shape formed in a substantially wave shape. From a structural point of view, the beltline reinforcement 48 includes an upper edge flange portion 48A and a lower edge flange portion 48B, and convex portions and concave portions alternately between the upper edge flange portion 48A and the lower edge flange portion 48B. It is comprised by the uneven | corrugated shaped part 48C as a main-body part formed continuously. The belt line reinforcement 48 is joined to the door inner panel 42 by spot welding the upper edge flange portion 48A and the lower edge flange portion 48B to the door inner panel 42. Supplementally, the spot welding mounting seat is set on the door inner panel 42 side. As a result, in a state where the beltline reinforcement 48 is joined to the door inner panel 42, the uneven portion 48 </ b> C is separated from the door inner panel 42 by a predetermined distance. Further, the belt line reinforcement 48 is spot-welded to the door inner panel 42 at a front end portion 58 and a rear end portion 60 which will be described later, even at an uneven portion 48C.

  Further, boundary portions 52 and 54 having a predetermined width are set in the vicinity of both ends in the longitudinal direction of the beltline reinforcement 48, respectively. In FIG. 3A, the boundary portions 52 and 54 are illustrated by dots. As shown in FIGS. 3B, 3 </ b> C, and 3 </ b> D, the shelf width B <b> 1 of the main body portion 56 located between the boundary portions 52 and 54 is positioned outside the boundary portions 52 and 54. The front end 58 and the rear end 60 are set wider than the shelf width B2. Thereby, the rigidity of the main body part 56 is set higher than the rigidity of the front end part 58 and the rear end part 60, and the reinforcing patch is not required. The shelf width B is set such that the shelf width B1 for the main body portion 56, the shelf width B2 for the front end portion 58 and the rear end portion 60, and the boundary portions 52 and 54 are gradually changing sections as in this embodiment. However, the present invention is not limited to this, and the main body 56 may be set so that the shelf width gradually changes as a whole along the vehicle longitudinal direction.

  Further, the vertical width W2 of the top portion 58A of the front end portion 58 and the top portion 60A of the rear end portion 60 is set wider than the vertical width W1 of the top portion 56A of the main body portion 56. As described above, the belt line reinforcement 48 is not limited to the door inner panel 42 at the top 60A of the rear end 60 (and the top 58A of the front end 58) in addition to the upper edge flange 48A and the lower edge flange 48B. Spot welded.

  The beltline reinforcement 48 is manufactured by hot stamping. As shown in FIG. 6, two electrodes 64 and 66 are arranged at two locations in the vicinity of both ends in the longitudinal direction of the raw material 62 before being molded, which is cut into a rectangular flat plate shape, and heated by energization. The main body 56 positioned between the two electrodes 64 and 66 is a heating area and is heated to about 800 ° C. by energization to be hot stamped (high strength). On the other hand, the front end portion 58 and the rear end portion 60 are non-heated areas and become about 300 ° C. to 400 ° C. due to heat conduction, but are not hot stamped (high strength). In addition, the boundary parts 52 and 54 are made into the gradual change area | region where intensity | strength changes gradually.

  In this way, the belt line reinforcement 48 has the main body portion 56 positioned between the front and rear boundary portions 52 and 54 set to have high strength and high rigidity, and the front end portion positioned outside the boundary portions 52 and 54. 58 and the rear end portion 60 are set to have low strength and low rigidity. The front end portion 58 set to have low strength and low rigidity corresponds to the “front deformation portion” in the present invention, and the rear end portion 60 corresponds to the “rear deformation portion” in the present invention.

  In addition, supplementally, the upper part of the rear end portion 60 of the beltline reinforcement 48 is cut out in a rectangular shape, and a door for guiding the raising and lowering of the door glass 70 is provided in the cutout portion 68 (see FIG. 3A). The lower end of the rear end portion 46A of the frame 46 is inserted.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  The collision load at the time of a frontal collision is transmitted to the front pillar 12 via a front body (not shown). For this reason, the front pillar 12 is pushed to the vehicle rear side, and the door main body portion 44 of the front side door 24 is pushed against the center pillar 14. Thereby, the collision load at the time of the frontal collision is transmitted from the front pillar 12 to the center pillar 14 via the beltline reinforcement 48 which is a strength member disposed along the beltline 50 of the door main body 44, and the centerpillar. 14 is further transmitted to the rear side of the vehicle body.

  Here, as shown in FIGS. 2 and 7B, a load from the front pillar 12 to the vehicle rear side is input, and the rear end portion 44A of the door main body portion 44 is connected to the center pillar 14 (center pillar outer panel 36). When abutting against the front end portion 14 </ b> A, a collision reaction force from the front end portion 14 </ b> A of the center pillar 14 toward the vehicle front side is input to the rear end portion 44 </ b> A of the door main body portion 44. For this reason, the rear end portion 60 of the beltline reinforcement 48 is pressed toward the vehicle front side via the door inner panel 42. As a result, as shown in FIG. 7A, in the case of the front side door 74 to which the vehicle door structure according to this embodiment is not applied, the rear end portion 78 of the beltline reinforcement 76 is the center pillar 14. It is conceivable to bite into the front end portion 14A.

  On the other hand, in the present embodiment, the rear end portion 60 of the beltline reinforcement 48 is a rear deformation portion having lower strength and rigidity than the main body portion 56, so that the vehicle is connected to the rear end portion 60 of the beltline reinforcement 48. When the collision reaction force to the front side is input, the rear end portion 60 is plastically deformed as shown in FIG. Thereby, the energy at the initial stage of the collision is absorbed. Further, when the rear end portion 60 which is the rear deformable portion is plastically deformed by the collision reaction force from the front end portion 14A of the center pillar 14, the contact with the front end portion 14A of the center pillar 14 via the door inner panel 42 is achieved. The rear end portion 60 is plastically deformed so that the surface area increases. For this reason, the collision load input to the front end portion 14A of the center pillar 14 is dispersed by the increase in the area of the contact surface, and local deformation of the front end portion 14A of the center pillar 14 is suppressed. As a result, it is solved that the rear end portion 60 of the beltline reinforcement 48 bites into the front end portion 14A of the center pillar 14 and the opening operation of the front side door 24 becomes impossible. Therefore, according to the present embodiment, it is possible to open the front side door 24 even when the collision load is large. In other words, even when the collision load is large, the front side door 24 can be opened relatively easily.

  In the present embodiment, the front end portion 58 of the beltline reinforcement 48 is also set to have low strength and low rigidity, similarly to the rear end portion 60, so that the rear end portion is also on the front end portion 58 side of the beltline reinforcement 48. The same effect as that on the 60 side can be obtained. That is, when the door main body 44 is sandwiched between the front pillar 12 and the center pillar 14, the front end portion 58 of the beltline reinforcement 48 is plastically deformed to absorb energy at the beginning of the collision. Not only that, but the plastic deformation of the front end portion 58, which is the front deformation portion, increases the area of the contact surface of the front end portion 58 of the beltline reinforcement 48 with the rear end portion 12A of the front pillar 12 via the door inner panel 42. Therefore, local deformation of the front pillar 12 due to the front end 58 of the belt line reinforcement 48 biting into the rear end 12A of the front pillar 12 is suppressed or prevented. As a result, according to the present embodiment, not only local deformation of the center pillar 14 but also local deformation of the front pillar 12 can be suppressed.

  Furthermore, in the present embodiment, the vertical width W2 of the top portion 60A of the rear end portion 60 of the belt line reinforcement 48 is set wider than the vertical width W1 of the top portion 56A of the main body portion 56 of the belt line reinforcement 48. The belt line reinforcement 48 is spot welded to the door inner panel 42 not only at the upper edge flange portion 48A and the lower edge flange portion 48B but also at the top portion 60A of the rear end portion 60. Therefore, compared with a structure in which the rear end portion 60 is not spot welded to the door inner panel 42, the bonding strength of the rear end portion 60 of the beltline reinforcement 48 to the door inner panel can be increased. As a result, particularly the rear end portion 60 of the beltline reinforcement 48 can be firmly fixed to the door inner panel 42.

[Supplementary explanation of the above embodiment]
First, two modifications of beltline reinforcement will be described. In the description, the same components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the belt line reinforcement 80 shown in FIG. 8, the front end of the front end portion 58 is bent outward (perpendicularly) in the vehicle width direction. Similarly, the front end of the rear end portion 60 is bent outward (perpendicularly) in the vehicle width direction. By forming the front flange portion 82 and the rear flange portion 84 formed by such bending, the area of the contact surface that contacts the front end portion 14A of the center pillar 14 through the door inner panel 42 at the time of a frontal collision further increases. . Therefore, a load distribution effect can be further obtained than in the embodiment described above.

  Further, in the belt line reinforcement 90 shown in FIG. 9, the above-described belt line reinforcement is that the uneven portion 90 </ b> C as the main body is formed between the upper edge flange portion 90 </ b> A and the lower edge flange portion 90 </ b> B. 48. However, the belt line reinforcement 90 is characterized in that the shape of the front end portion 92 of the convex portion and the rear end portion 94 of the convex portion of the concavo-convex shape portion 90C is a trumpet shape in a side view of the vehicle. The trumpet shape referred to here is a flared shape in which the vertical width of the convex portion (gradually) increases toward the front end in the vehicle front-rear direction in the case of the front end portion 92 of the convex portion. Further, the rear end portion 94 of the convex portion is a hem-expanding shape in which the vertical width of the convex portion increases gradually as it goes toward the rear end in the vehicle front-rear direction. According to the above configuration, when the rear end portion 60 of the beltline reinforcement 90 abuts the front end portion 14A of the center pillar 14 via the door inner panel 42 at the time of a frontal collision, the upper and lower portions of the rear end portion 94 of the convex portion The load can be dispersed and transmitted to the front end portion 14A by an amount corresponding to the increased width. At the same time, when a collision reaction force is received from the front end portion 14A of the center pillar 14, a larger load can be received as much as the vertical width of the rear end portion 94 of the convex portion increases, and the deformation amount (energy absorption) Amount) also increases.

  Furthermore, in the above-described embodiment, not only the rear end portion 60 of the beltline reinforcement 48 but also the front end portion 58 is set to have low strength and low rigidity. However, the present invention is not limited to this, and at least the rear end portion 60 has low strength. And what is necessary is just to set to low rigidity. This also applies to the beltline reinforcement 80 shown in FIG. 8 and the beltline reinforcement 90 shown in FIG.

  In the above-described embodiment, the vehicle door structure according to the present invention is applied to the front side door 24, which is most effective. However, the present invention is not limited to this, and the rear side door is not limited to the front side door. Similarly, the vehicle door structure according to the present invention may be applied.

  In the embodiment described above, the rear end portion 60 of the beltline reinforcement 48 is depicted as being plastically deformed in a Λ shape as shown in FIG. This is a schematic depiction of plastic deformation. Therefore, it may be a plastic deformation in which the rear end portion of the beltline reinforcement is crushed in the longitudinal direction of the vehicle, which is the longitudinal direction of the beltline reinforcement. In short, as a result of plastic deformation, a contact surface with the front end portion 14A of the center pillar 14 via the door inner panel 42 (in other words, a pressing surface that presses the front end portion 14A of the center pillar 14 toward the vehicle rear side, or Any modification may be employed as long as the area of the reaction force receiving surface receiving the reaction force from the front end portion 14A of the center pillar 14 increases. In the case of FIG. 7B, the contact surface is S.

10 Front side door (vehicle door)
12 Front Pillar 14 Center Pillar 40 Door Outer Panel 42 Door Inner Panel 44 Door Main Body 48 Belt Line Reinforcement 48A Upper Edge Flange 48B Lower Edge Flange 48C Uneven Shape (Main Body)
50 Belt line 58 Front end (front deformation)
60 Rear end (rear deformation)
80 Belt Line Reinforcement 90 Belt Line Reinforcement 90A Upper Edge Flange 90B Lower Edge Flange 90C Uneven Shape (Main Body)

Claims (3)

A door main body portion that is arranged between the front pillar and the center pillar and includes a door outer panel and a door inner panel;
An elongated belt line reinforcement disposed along the belt line in the door body, and
After being set at the rear end of the beltline reinforcement and plastically deforming by receiving a load from the front pillar to the vehicle rear side to increase the area of the contact surface with the center pillar via the door inner panel Side deformation part,
A vehicle door structure. Furthermore, it is set at the front end of the beltline reinforcement, and plastically deforms by receiving a load from the front pillar to the vehicle rear side, thereby increasing the area of the contact surface with the front pillar via the door inner panel. It has a front deformation part,
The vehicle door structure according to claim 1. The vertical width of the rear end portion of the beltline reinforcement is set wider than the vertical width of the main body portion of the beltline reinforcement,
In addition to the upper edge flange portion provided on the upper edge side and the lower edge flange portion provided on the lower edge side, the belt line reinforcement is also spot welded to the door inner panel at the rear end portion.
The vehicle door structure according to claim 1 or 2.

Images