JP6157875B2 - Front door structure of center pillarless vehicle - Google Patents

Description

  The present invention relates to a front door structure for a center pillar-less vehicle that does not include a center pillar.

  As a front door structure of a vehicle without a center pillar, conventionally, a pillarless reinforcing member extending from a substantially upper end to a lower end of the door is disposed in the rear end portion of the front door, and the vertical direction is defined by the reinforcing member and the door inner panel. (For example, refer to Patent Document 1), or a belt belt reinforcing member disposed on a door belt line portion (for example, refer to Patent Document 2).

Japanese Patent No. 4113733 Japanese Patent No. 4154996

  By the way, in the case of a vehicle equipped with a center pillar, at the time of a frontal collision of the vehicle, the collision load is transmitted to the center pillar by abutting the beltline reinforcing member against the center pillar, and further transmitted to the rear of the vehicle. However, in the case of a vehicle without a center pillar, it is necessary to dispose a pillarless reinforcing member extending in the vertical direction at the rear end portion of the front door so as to transmit the collision load to the pillarless reinforcing member and to distribute it upward and downward. Conceivable.

Although Patent Documents 1 and 2 disclose that the pillarless reinforcing member is disposed or the beltline reinforcing member is disposed, the joint relationship between the beltline reinforcing member and the pillarless reinforcing member is unknown. Therefore, it is unclear whether or not the effect of dispersing the collision load vertically can be obtained.

The present invention has been made in view of the above-described conventional situation. The collision load at the time of a frontal collision of a vehicle can be transmitted to the pillarless reinforcing member and can be distributed upward and downward, and the collision load at the time of a side collision. It is an object of the present invention to provide a front door structure for a center pillar-less vehicle that can be dispersed in the vertical direction and optimized in terms of cost and weight.

According to the first aspect of the present invention, a pillarless reinforcing member extending to the vicinity of the upper and lower ends of the door is disposed in the rear end portion of the front door, and a closed cross section extending in the vertical direction is formed by the pillarless reinforcing member and the door inner panel. In the front door structure of the center pillarless vehicle in which the beltline reinforcing member is arranged in the beltline part,
At least a portion near the belt line portion of the pillarless reinforcing member is bent inward in the vehicle width direction following a base surface facing outward in the vehicle width direction and a front edge of the base surface in a cross-sectional plan view. A front vertical wall facing the front of the vehicle, and an extension portion is provided at a rear end portion of the belt line reinforcement member, and the extension portion reinforces the pillarless reinforcement with a load from the belt line reinforcement member. It has a transmission part that transmits to the member, and an upper extension part and a lower extension part that extend upward and downward following the transmission part and are fixed to the pillarless reinforcing member, and are generally T-shaped in a side view. The transmission portion has a rear vertical wall surface that abuts on the front vertical wall surface of the pillarless reinforcing member, and the upper extension portion is longer than the lower extension portion .

  According to the front door structure of the center pillarless vehicle according to claim 1, the front vertical wall surface is formed on the pillarless reinforcing member, and the rear vertical wall surface is formed on the transmission portion of the extending portion of the beltline reinforcing member. Can be reliably transmitted from the beltline reinforcement member to the pillarless reinforcement member via the wide contact area of the vertical wall surface, and further to the transmission portion of the extension portion. The upper and lower extensions can be reliably dispersed upward and downward.

By the way, the pillarless reinforcing member may be configured in a cross-sectional shape in which the section modulus changes greatly in the vicinity of the belt line facing portion, and the portion in which the section modulus changes becomes a break point in rigidity with respect to a side collision load. There is. In the present invention, since the extending portion is fixed so as to cover the belt line facing portion of the pillarless reinforcing member, the belt line facing portion of the pillarless reinforcing member is reinforced. Therefore, it is possible to avoid the problem that the belt line facing portion of the pillarless reinforcing member becomes a rigidity break point with respect to the side collision load.

  As described above, according to the present invention, the collision load at the time of a frontal collision can be transmitted to the pillarless reinforcing member and distributed upward and downward by a simple structure, and the load at the time of a side collision can also be transmitted to the pillarless reinforcing member. It can be dispersed and is advantageous in terms of cost and weight because it does not require special parts for side impact loads.

Further, according to the present invention, since the upper extension portion is made longer than the lower extension portion, specifically, the section modulus of the pillarless reinforcing member is changed in the vicinity of the belt line opposing portion, specifically, the upper portion is higher than the opposing portion. It is possible to more reliably avoid the problem that becomes a break point in rigidity with respect to a side collision load when the section modulus is configured to be smaller than the lower side without increasing cost and weight.

It is the side view seen from the vehicle outer side of the front door provided with the front door structure of the center pillarless vehicle by Example 1 of the present invention. It is a side view of the principal part of the front door structure. FIG. 3 is a cross-sectional plan view (a cross-sectional view taken along line III-III in FIG. 1) of the pillarless reinforcing member having the front door structure. FIG. 4 is a cross-sectional plan view (a cross-sectional view taken along line IV-IV in FIG. 1) of a connection portion between the pillarless reinforcing member and the belt line reinforcing member of the front door structure. FIG. 5 is a cross-sectional plan view (cross-sectional view taken along the line V-V in FIG. 1) of the pillarless reinforcing member having the front door structure. FIG. 6 is a cross-sectional plan view (cross-sectional view taken along line VI-VI in FIG. 1) of the pillarless reinforcing member having the front door structure. FIG. 7 is a cross-sectional plan view (cross-sectional view taken along line VII-VII in FIG. 1) of the pillarless reinforcing member having the front door structure. It is a side view of the center pillarless vehicle.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 8 are views for explaining a front door structure of a center pillarless vehicle according to a first embodiment of the present invention. In this embodiment, front, rear, left, and right mean front, rear, left, and right when the vehicle front is viewed from the vehicle interior side.

In the figure, reference numeral 1 denotes a center pillar-less vehicle. A large door opening 2a extending from the front pillar 2b to the rear pillar 2c is formed on the side surface of the vehicle body 2 of the vehicle 1, and the door opening 2a is centered on the center. Does not have pillars. A front door 3 is disposed at the front portion of the door opening 2a so as to be rotatable in the vehicle width direction by a hinge at the front end portion, and a rear door 4 is disposed at the rear portion so as to be slidable back and forth by a slide mechanism. Yes.

The front door 3 is configured such that the outer panel 3a and the inner panel 3b are joined to each other by hemming at their peripheral portions so as to form a hollow shape. The lower half of the front door 3 is a door body 3c that accommodates door parts such as a door glass raising / lowering mechanism, and the upper half is a door sash 3d that guides the door glass 5 to be movable up and down. .

A pillarless reinforcing member 6 is disposed in the rear end portion 3e of the front door 3 so as to be positioned between the outer panel 3a and the inner panel 3b. The pillarless reinforcing member 6 extends from the vicinity of the lower end of the rear end portion 3e to the vicinity of the upper end, and the upper reinforcing member 7 is fixed to the upper end portion of the pillarless reinforcing member 6 and the lower reinforcing member 8 is fixed to the lower end portion thereof. Has been. These reinforcing members 6, 7, and 8 are coupled to the door inner panel 3b, and the pillarless reinforcing member 6, and the closed cross section that extends in the vertical direction between the upper and lower reinforcing members 7 and 8 and the door inner panel 3b. A is formed.

A rear end portion 11a of the door impact beam 11 is fixed by welding to the lower reinforcing member 8 portion of the door inner panel 3b. This door impact beam 11 is for receiving a collision load at the time of a vehicle side collision, and is arranged along the inner surface of the door outer panel 3a, and its front end portion 11b is welded and fixed to the front edge portion of the door inner panel 3b. Yes.

The upper edge 3f of the door body 3c of the front door 3 is a door belt line portion, and a belt line reinforcing member 9 is disposed in the door belt line portion. This belt line reinforcing member 9 is made of a steel round pipe, its front end 9a is fixed to the front end of the door body 3c via a bracket 9b, and its rear end 9c is an extension plate (extension part) 10. It is connected to the pillarless reinforcing member 6 via.

The pillarless reinforcing member 6 has a base surface 6a facing outward in the vehicle width direction and a front side facing the front of the vehicle after being bent inward in the vehicle width direction following the front edge of the base surface 6a. And a vertical wall surface 6b.

Here, the pillarless reinforcing member 6 is formed in a cross-sectional shape in which the section modulus is greatly different between an upper portion and a lower portion from a portion where the beltline reinforcing member 9 is opposed to and connected thereto. The upper portion is bent forward from the front vertical wall surface 6b and is welded and fixed to the door inner panel 3b. The rear vertical wall surface 6d is bent inward from the rear edge of the base surface 6a. Further, it has a cross-sectional hat shape having a rear flange portion 6e bent rearward from the rear side vertical wall surface 6d and welded and fixed to the vertical wall surface 3b 'facing the vehicle rear side of the door inner panel 3b (FIG. 3). FIG. 4).

On the other hand, the lower portion has the base surface 6a, the front vertical wall surface 6b, the front flange portion 6c, and the rear flange portion 6c, but has a rear vertical wall portion bent inward from the rear edge of the base surface 6a. do not do. However, the height in the vehicle width direction of the front vertical wall surface 6b of the lower portion is set to a shape that is approximately twice that of the front vertical wall surface 6b of the upper portion (see FIGS. 5 and 6). Thus, since the height of the front vertical wall surface 6b of the lower part is higher than that of the upper part, the sectional modulus of the pillarless reinforcing member is larger in the lower part and smaller in the upper part.

Further, as shown in FIG. 7, the lower reinforcing member 8 has a base surface 8a, a front vertical wall surface 8b, a front flange portion 8c, and a rear flange portion 8e similar to the lower end portion of the pillarless reinforcing member 6, The height in the vehicle width direction of the wall surface 8 b is set to be higher than the front vertical wall surface 6 b at the lower end of the pillarless reinforcing member 6. The front flange portion 8c is fixed by welding to the door inner panel 3b, while the rear flange portion 8e is disposed opposite to the vertical wall surface 3b 'facing the vehicle rear side of the door inner panel 3b. It is not welded to 3b '.

The extension plate 10 is connected to the rear end portion 9c of the beltline reinforcing member 9, and transmits a collision load from the beltline reinforcing member 9 to the pillarless reinforcing member 6, and the transmitting portion. An upper extension 10b extending upward and a lower extension 10b extending downward following the rear end of 10a have a generally T shape in side view. The upper extension portion 10b is longer than the lower extension portion 10c, specifically, is set to be approximately twice as long.

The transmission portion 10a has a rear vertical wall surface 10d bent outward in the vehicle width direction following the rear end portion thereof, and the upper extension portion 10b and the lower extension portion 10c have the same vertical wall surfaces 10b 'and 10c. '. These vertical wall surfaces 10 d, 10 b ′, 10 c ′ are in contact with the front vertical wall surface 6 b of the pillar reinforcing member 6. The upper extension portion 10b has a front flange portion 10e that is bent to the front side following the vertical wall portion 10b '.

The transmission portion 10a is welded and fixed to the door inner panel 3b of the belt line portion, and the upper extension portion 10b and the lower extension portion 10b are welded and fixed to the base surface 6a of the pillar reinforcing member 6, and the upper extension portion The front flange portion 10e of 10b is fixed to the front flange portion 6c of the pillar reinforcing member 6 by welding.

  According to this embodiment, the front-side vertical wall surface 6b is formed on the pillarless reinforcing member 6, the rear-side vertical wall surface 10d is formed on the transmission portion 10a of the beltline reinforcing member 9, and both the vertical wall surfaces 6b and 10d are brought into contact with each other. Therefore, the collision load at the time of a vehicle frontal collision can be reliably transmitted from the beltline reinforcing member 9 to the pillarless reinforcing member 6 through the wide contact area of the vertical wall surfaces 6b and 10d, and the upper extension portion 10b and the lower extension portion. By 10c, it can be reliably dispersed upward and downward.

  Further, since the front vertical wall surfaces 10b 'and 10c' are also formed on the upper and lower extension portions 10b and 10c and are brought into contact with the front vertical wall surface 6b of the pillarless reinforcing member 6, the collision load is also considered from this point. Can be reliably transmitted to the pillarless reinforcing member 6 and can be dispersed in the vertical direction.

In this embodiment, the pillar-less reinforcing member 6 is configured to have a cross-sectional shape in which the section modulus is smaller at the upper portion than the beltline reinforcing member 6 facing portion and larger at the lower portion, and therefore the section modulus changes. In the present embodiment, the opposing portion of the pillarless reinforcing member 6 is reinforced by the extension plate 10, so that the vicinity of the opposing portion is a point of rigidity against the side impact load. It is possible to avoid the problem that becomes the break point.

  Further, since the connecting portion between the pillarless reinforcing member 6 and the beltline reinforcing member 9 is reinforced by the extension plate 10, the rigidity of the front door 3 itself can be increased, and the door installation accuracy and thus the door opening / closing performance can be improved. .

As described above, in this embodiment, with a simple structure, a collision load at the time of a frontal collision can be reliably transmitted from the beltline reinforcing member 9 to the pillarless reinforcing member 6 and can be dispersed upward and downward, and at the time of a side collision. This load can be transmitted and distributed to the pillarless reinforcing member 6, which is advantageous in terms of cost and weight because it does not require a side collision load dedicated component.

In addition, the pillarless reinforcing member 6 is configured such that the section modulus above the opposite portion of the belt line reinforcing member 9 is smaller than the lower side, and the upper extension portion 10b is formed longer than the lower extension portion 10c. The problem that becomes the point of rigidity against the side collision load can be avoided more reliably without increasing the cost and weight.

  In the above embodiment, the case where the extension plate 10 is separate from the beltline reinforcing member 9 has been described. However, for example, the beltline reinforcing member is made of sheet metal, and the extension plate is formed integrally with the beltline reinforcing member. May be.

3 Front door 3b Door inner panel 3f Door belt line part 6 Pillarless reinforcement member 6a Base surface 6b Front side vertical wall surface 9 Belt line reinforcement member 10 Extension plate (extension part)
10a Transmission part 10b, 10c Upper extension part, Lower extension part 10d Rear side vertical wall surface A Closed section

Claims (1)

A pillarless reinforcing member extending to the vicinity of the upper and lower ends of the door is disposed in the rear end portion of the front door, and a closed section extending in the vertical direction is formed by the pillarless reinforcing member and the door inner panel. In the front door structure of the center pillarless vehicle in which the members are arranged,
At least a portion near the belt line portion of the pillarless reinforcing member is bent inward in the vehicle width direction following a base surface facing outward in the vehicle width direction and a front edge of the base surface in a cross-sectional plan view. A front vertical wall facing the front of the vehicle,
An extension portion is provided at a rear end portion of the beltline reinforcing member,
The extension portion includes a transmission portion that transmits a load from the beltline reinforcement member to the pillarless reinforcement member, and an upper extension portion that extends upward and downward following the transmission portion and is fixed to the pillarless reinforcement member. And a lower extension, and is generally T-shaped in side view,
The transmission unit is configured to have a side longitudinal wall surface after abutting the front vertical wall surface, the front door of the center pillar-less vehicle wherein the extension, characterized in longer <br/> that from the lower extension of the Piraresu reinforcing member Construction.

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