INTERNAL REINFORCEMENT STRUCTURE FOR AUTOMOTIVE VEHICLE DOOR PANELS
A vehicle door assembly structural reinforcement is disclosed. Glass supporting channels are disposed between inner and outer door panel assemblies. A belt reinforcement member is part of the outer door panel assembly. Connector brackets connect the belt reinforcement member to the inner door panel assembly to reduce the effective span between end supports for the belt reinforcement member, thereby enhancing the stiffness of the belt reinforcement member and the door assembly.
1 . A door assembly for an automotive vehicle comprising:
a door outer panel extending from a forward edge portion of a vehicle door opening to a rearward vehicle door opening edge portion;
a door inner structural panel assembly;
a belt reinforcement member between the outer panel and the inner structural panel assembly and extending from the forward edge portion to the rearward edge portion;
first and second window glass supporting channels between the belt reinforcement member and the door inner structural panel assembly, the glass supporting channels being fixed to the door inner panel assembly; and
at least one connecting bracket mechanically connecting the belt reinforcement member to the inner structural panel assembly whereby the door assembly stiffness is enhanced.
2 . A door assembly for an automotive vehicle comprising:
a door outer panel extending from a forward edge portion of a vehicle door opening to a rearward vehicle door opening edge portion;
a door inner structural panel assembly;
a belt reinforcement member between the outer panel and the inner structural panel assembly and extending from the forward edge portion to the rearward edge portion;
first and second window glass supporting channels between the belt reinforcement member and the door inner structural panel assembly, the glass supporting channels being fixed to the door inner structural panel assembly;
a first connecting bracket mechanically connecting the belt reinforcement member and the inner structural panel assembly within a glass window glass projection area in proximity to a forward edge of a window glass in the glass supporting channels;
a second connecting bracket mechanically connecting the belt reinforcement member and the inner structural panel assembly within a window glass projection area in proximity to a rearward edge of a window glass in the glass supporting channel.
3 . The door assembly set forth in claim 1 wherein the connecting bracket comprises a first portion secured to the belt reinforcement member at a securement location within the projection area of a window glass and a second portion secured to the first window glass supporting channel at a location forward of the securement location.
4 . The door assembly set forth in claim 3 wherein a second connecting bracket mechanically connects the belt reinforcement member and the inner structural panel assembled within the glass projection area in proximity to a rearward edge of a window glass in the glass supporting channels.
5 . The door assembly set forth in claim 1 wherein the door inner structural panel assembly comprises first inner panel and a second inner panel, the second inner panel being disposed between the first inner panel and the glass channels, the connecting bracket being mechanically connected to the second inner panel.
6 . The door assembly set forth in claim 2 wherein the door inner structural panel assembly comprises a first inner panel and a second inner panel, the second inner panel being disposed between the first inner panel and the glass channels, the first and second each being mechanically connected to the second inner panel.
7 . The door assembly set forth in claim 5 wherein the inner door panels of the inner structural panel assembly are secured together at respective forward and rearward panel margins, the belt reinforcement member extending between the forward and rearward panel margins;
a span between the forward and rearward margins being greater than a span between the mechanical connections between the belt reinforcement member and the first and second connecting brackets whereby the structural stiffness of the door assembly is enhanced.
8 . The door assembly set forth in claim 5 , including a door outer panel, the belt reinforcement member being disposed between the second inner panel and the door outer panel, the belt reinforcement member and the outer panel forming a door outer structural panel assembly.
9 . The door assembly set forth in claim 7 wherein a functional relationship between the span between the mechanical connection and deflection due to a force applied to the belt reinforcement is expressed as
δ=Fl 3 [X]EI, where
δ=deflection to be minimized,
F=force,
l=length of span between end supports,
E=modulus of elasticity,
I=2 nd moment of inertia, and
X=load case factor.
10 . The door assembly set forth in claim 1 wherein the mechanical connection of the belt reinforcement member to the inner structural panel assembly includes a releasable fastener, the inner structural panel assembly including at least one access opening to permit entry of a tool to attach and release the fastener.
11 . The door assembly set forth in claim 2 wherein the mechanical connection of each connection bracket with the inner structural panel assembly comprises a releasable fastener, the inner structural panel assembly having access openings to permit entry of a tool to attach and release the fastener.