Theodore and Associates

Chassis

“The combination of a rigid backbone structure connecting front and rear structures; in combination with the front and rear suspensions affixed to the to the front and rear structures; to create a complete, self-supporting chassis, without the need for a separate frame….”

A plug in aluminium design with established front and rear crash dynamics. The Theodore and Associates Uni-Chassis is shown with a Shelby Cobra body.

Uni- Chassis proof-of-concept-1

Because of the heavy use of extrusions and the six castings, tooling costs also are lower than a typical spaceframe, according to Theodore: “Conservatively, we estimate 10% less, although one study indicates more. The real investment savings comes when you apply Uni-Chassis to a family of vehicles. Wheelbase can be increased basically by increasing the length of the backbone extrusion and quill shaft (of course, front and rear structures need to be designed to handle the platform bandwidth), spreading investment costs among multiple vehicles.”

Front, rear, and offset impact loads are handled in much the same manner as conventional structures, with crush beams attached to the front and rear of the Uni-Chassis. And because most of the vehicle mass is carried by the Uni-Chassis in front and rear impacts, body impact loads are minimized—much like body-on-frame construction.

“One potential advantage is that Uni-Chassis decouples chassis and body crashworthiness requirements, such that the decel pulse can be ‘tuned’ by both the Uni-Chassis and the interaction of the body to the Uni-Chassis,” Theodore explained. “On the other hand, the body structure must still be designed for side impact, rollover, and restraint system loads, much like a pickup cab.”

Finite-element modeling indicates that torsional stiffness is equal to or greater than competitive supercar chassis. Bending stiffness is claimed to be much higher.

“The combination of a rigid backbone structure connecting front and rear structures; in combination with the front and rear suspensions affixed to the to the front and rear structures; to create a complete, self-supporting chassis, without the need for a separate frame….”

Other advantages include:

¤ Weight, cost and investment savings

¤ Battery Box on Plug-in Hybrid and BEVs doubles as the backbone

¤ Adapt different bodies to the same Uni-Chassis™

¤ Uni-Chassis™ is scaleable to different size vehicles by varying backbone length

¤ Uni-Chassis™ is modular, allowing different powertrains within the same architecture

¤ Creates a “rolling chassis” before installation of the body

¤ De-couple chassis loads from body loads

¤ Decouples chassis and body crashworthiness requirements

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s