1993 Acura Legend Coupe Structure

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Overview

To meet both visual and functional quality goals, Legend engineers created a rigid
cabin, thick exterior panels with improved corrosion resistance, and incorporated a host of detail refinements. To help maintain the efficiency for which the Legend is known, while improving its performance and comfort, they employed sophisticated weight-saving techniques throughout the unit-body structure. For 1993, the Legend Coupe has been made quieter and more sophisticated with the addition of sound insulation material and changes in the drivetrain and its mounting system.

Structure

High goals with respect to rigidity, passive safety and corrosion resistance were set for the1993 Legend Coupe body.The engineering staff strove to increase torsional rigidity and improve both handling and ride quality.

To accomplish this, the latest NASTRAN computer-aided structural analysis
and design programs were applied which resulted in a number of detail structural
measures. The cross member at the rear bulkhead and the cross member in the center of the cabin floor were reinforced. This resulted in a tighter cabin and reduced levels of noise and vibration. Additional reinforcement was also added to the front framerails which stiffened the front end and enhanced handling precision.

For 1993, noise insulation has also been improved. This was accomplished
through the use of thicker window glassand sound-deadening material throughoutthe vehicle.The inner and outer door panels are thicker (0.85mmvs.0.75) and therefore more rigid. The thickness of most outer body panels, except the front fender panels, has also been increased from 0.70 or 0.75 to 0.85mm- adding not only a further increment of rigidity but further increasing resistance to minor dents. Thanks to excellent management of impact loads, primarily due to straight front frame members made possible by the longitudinal powertrain, the possibility of longitudinal cabin deformation in frontal impacts is minimized. Four honeycomb panels are bonded to the floor pan just ahead of the front and rear seats. Consisting offormed organic material between steel plates, the light, remarkably strong honeycomb material stems from jet aircraft technology.

Engine Mounting System

To further minimize drivetrain vibration and noise, the Legend Coupe uses a new
layout for the engine mounting system. This consists of one solid mount and two
stopper mounts at the front of the engine, two hydraulic mounts in the middle of the engine/transmission unit, and one solid mount at the rear of the transmission. The three types of mounts are tuned to cancel out the various vibration frequencies created by the drivetrain and prevent them from reaching the cabin.

Corrosion Resistance

All critical body panels are galvanized (zinc-coated). Almost 90% are zinc-coated on both sides in order to provide the highest corrosion resistance possible and ensure long-term durability and high-quality appearance.

FIT AND FINISH

In their quest for quality, the Acura body engineers analyzed all the gaps between body panels, and at points where separate units such as headlights and taillights mount to the body. Over the various areas of the body, all gaps were reduced, and some were eliminated entirely.

A 4-coat, 4-bake, 23-step finishing process enhances corrosion protection bile contributing to the durability and quality appearance of the Legend. Corrosion resistant coats include zinc phosphate, sealant, a chip-resistant lower-body primer and a PVC undercoat. Additionally, waxis injected into areas where moisture might accumulate. The air dam, front fender leading edges, the hood's forward portion and the rocker panels are coated with a layer of flexible plastic prior to painting to help prevent chipping.

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