Unitized B-I-W

Body-Frame Construction

• Separate body and frame
• The frame carries all the structural load

Integral Construction

• Chassis and body are separately built
• Chassis and body are welded together to form a single unit
• Historically, a step towards unitized body

Chassiless Construction

• Chassis and body can not be discerned from one another, a.k.a Unitized body
• The body design is more complex
• The body provides structural support

• Spot welding is extensively used in unitized body
• Bolts can be used in low stress areas
• Advantages of the unitized body:
  • Higher strength and stiffness
    • due to deeper panels and more flanges
  • Higher torsional stress
    • due to the higher enclosed area

Front End Spider

1- Long rail outer

6- Torque box - rear

11- Upper tie bar extension

Engine Compartment

1- Engine compartment side panel sub-assembly

4- Plenum sub-assembly

Plenum

1- Plenum panel

3- Cowl bar

Front Compartment Pan

1- Front compartment pan

2- Front seat anchor cross member

Rear End Spider

1- Rear long rail

4- Rear torque box - lower

Rear Compartment Pan

1- Rear compartment pan

2- Rear end spider sub-assembly

Front & Rear Compartment Pans

1- Front compartment pan sub-assembly

5- Rear torque box upper

Body Side Frame (Sedan)

1- Engine compartment rail outer upper

10- Rear quarter outer panel to rear end panel filler

Rear End Cross Body Parts

1- Rear seat back panel

5- Rear end panel

Cross Car Parts at Roof

1- Windshield header

4- Roof outer panel

• TEC452 Home
• Body Engineering Index
• Body Components
• Body Design Factors
• Unitized B-I-W
• Hydroforming
• Vibration and Noise
• High-Strength Steel Design Guidelines
• Glass Design
• Neon B-I-W Case Study