Torque box assembly for a vehicle

A torque box assembly for mounting between a vehicle frame side rail and a body side sill for supporting a rear suspension trailing link. The torque box assembly includes two interconnected box members and two mounting flanges, with the trailing link resiliently connected to one of the box members.

FIELD OF THE INVENTION 
This invention relates generally to vehicle frames and body side sills and, 
more particularly, to a torque box assembly therebetween for resiliently 
supporting an end of a rear suspension trailing link. 
BACKGROUND OF THE INVENTION 
A known torque box arrangement is disclosed in Kazyak U.S. Pat. No. 
5,320,403, wherein a pair of such torque boxes provide a connection 
between front and passenger compartment structural subassemblies of a 
vehicle space frame. 
Another known torque box assembly is illustrated in FIGS. 7 and 9, and will 
be described later. 
SUMMARY OF THE INVENTION 
A general object of the invention is to provide an improved torque box 
assembly for use on a vehicle frame. 
Another object of the invention is to provide a rear underbody torque box 
assembly which retains a rear suspension trailing link; provides torsional 
stiffness to the vehicle; provides a hoist point at the rear of the 
vehicle; provides an attachment point for tie-down chains used on rail and 
truck carriers; and which is installed on the vehicle out of the underbody 
air stream, reducing drag. 
A further object of the invention is to provide a torque box assembly 
including first and second interconnected boxes secured among a vehicle 
side rail, floor pan, and body side sill. 
A still further object of the invention is to provide a plate member 
secured to a vehicle side rail and having a center opening with a first 
box secured around the opening, a second box having a bottom wall secured 
to the plate member and side walls secured to a floor pan and body side 
sill, with a resilient end assembly of a rear suspension trailing link 
secured to the first box, such that no distortion occurs in the desired 
width between the frame side rail and the body side sill, to cause 
non-uniform gaps between adjacent body parts. 
These and other objects and advantages will become more apparent when 
reference is made to the following drawings and the accompanying 
description.

BEST MODE FOR CARRYING OUT THE INVENTION 
Referring now to the drawings in greater detail FIGS. 1-6 illustrate a 
vehicle frame 10 having rear underbody torque box assembly 12 mounted 
thereon. 
The torque box assembly 12 includes a plate member 14 having a four-sided 
opening 16 formed in the center portion thereof, and a first four-sided 
box 18 (FIG. 2) mounted on the plate member around the edge of the 
opening. The box 18 includes a rear wall 20, a shorter front wall 22, two 
tapered side walls 24 and 26 interconnecting the front and rear walls, and 
a lateral flange 27 (FIGS. 3 and 6) between the rear wall 20 and rear 
portions of the side walls 26 and 24 interconnected inturned co-planar 
flanges 28 are formed at the top edges of the flange 27 and the three 
walls 22, 24 and 26, forming an opening 29 (FIGS. 2, 3 and 6). An opening 
30 (FIG. 6) is formed in the rear wall 20. 
A second four-sided box 32 includes three equal height walls 34, 36 and 38, 
a fourth higher wall 40 (FIGS. 2 and 5), and a bottom wall 42. An 
outwardly extending flange 44 (FIGS. 2 and 5) is formed on the upper edge 
of the fourth wall 40, and a down-turned edge 46 (FIGS. 2 and 5) is formed 
on the free end of the flange 44. A small oval opening 48 is formed in the 
bottom wall 42, serving as a locking receptacle for a suitable bolt (not 
shown) for securing thereto tie down chains used on rail and truck 
carriers. 
A first mounting bracket 50 (FIGS. 3-5) having a pair of threaded openings 
52 formed therein is mounted on a side rail 54 (FIGS. 1-5) of the frame 
10. A pair of bolts 56 extend through aligned openings 58 and 60 (FIGS. 4 
and 5) in the plate member 14 and the side rail 54, respectively, into the 
threaded openings 52. 
A second mounting bracket 62 (FIGS. 3 and 5) having a pair of threaded 
openings 64 formed therein is mounted on the bottom wall 42. A pair of 
bolts 66 extend through aligned openings 68 and 70 (FIG. 5) in the plate 
member 14 and the bottom wall 42, respectively, into the threaded openings 
64. 
As best seen in FIG. 5, the flange 44 extending from the wall 40 of the box 
32 is secured between a side rail flange 72 and a floor pan 74, such as by 
spot-welding. For the vehicle selected herein, the side rail flange 72 is 
an extension of the side rail 54. As noted in FIG. 3, the wall 36 of the 
box 32 is secured to a body side sill 76 (FIGS. 2 and 3), such as by 
spot-welding. 
A rear suspension trailing link 78 (FIGS. 1, 3 and 6) extends from a wheel 
assembly 80 (FIG. 1) to a resilient end assembly 82 (FIGS. 1, 3 and 6) 
mounted in the opening 30 (FIG. 6) in the rear wall 20 so as to extend 
into the box 18. 
Referring now to FIGS. 7 and 8, there is illustrated the above referenced 
known prior art torque box assembly 84. The assembly 84 includes six 
components 86, 88, 90, 92, 94 and 96 (FIG. 8). As indicated in FIG. 7 by 
rows of x's and asterisks, the six weld stations are required to complete 
the assembly on the vehicle, some for securing one part of the assembly to 
another, with flanges 98a/98b, and 100 being spot-welded to the vehicle 
outer side sill (not shown), and flanges 102 and 104 being spot-welded to 
the vehicle side rail of the frame (not shown). Bolts indicated at 106 in 
FIG. 7, extend upwardly through openings 108 and 110 (FIG. 8) formed in 
the components through openings 108 and 110 (FIG. 8) formed in the 
components 94 and 92, respectively, into threaded holes 112 formed in the 
tap plate component 90. A trailing link 114 (FIG. 7) is confined between 
pivotally mounted cylindrical rubber bushings 116 at the ends thereof, the 
front one being connected to the component 94. A plurality of 
strengthening darts 118 and 120 are formed by pressing in selected points 
along corners of the components 92 and 88, respectively. In contrast, the 
torque box assembly 12 consists of two box members 18 and 34 and two 
mounting brackets 50 and 62, and requires spot-welding at only two 
stations, i.e., between the wall 36 and the body side sill 76 (FIG. 2), 
and through the flange 44 confined between the side rail flange 72 and the 
floor pan 74 (FIG. 5). 
INDUSTRIAL APPLICABILITY 
It should be apparent that the torque box assembly invention provides 
several functions, including serving as a retention means for the rear 
suspension trailing link; providing torsional stiffness to the vehicle; 
providing a hoist point on the rear of the vehicle; and providing an 
attachment location for rear shipping tie-down chains used on rail and 
truck hauling units. It also is mounted out of the underbody air stream, 
thus reducing drag, fitting nicely between the frame side rail and body 
side sill, without causing any distortion in the width therebetween. 
It should also be apparent that the invention provides a compact, 
light-weight, and easily manufactured torque box assembly. 
While but one embodiment of the invention has been shown and described, 
other modifications in individual part shapes and sizes are possible as 
required to suit different vehicle frame requirements.