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What are the differences between unibody and body-on-frame structures?

1 Answers

LaJayden

07/30/25 2:42am

The differences between unibody and body-on-frame structures lie in their distinct body constructions: unibody employs a separated load-bearing frame structure, while body-on-frame uses an integrated body structure. Body structure refers to the arrangement of various components forming the vehicle body and their assembly methods. Based on load-bearing methods, body structures can be categorized into: body-on-frame, unibody, and semi-unibody. Body-on-frame vehicles feature a rigid frame (also called chassis frame), where the frame and body are flexibly connected via springs or rubber cushions. Components like the engine, part of the transmission system, and body assemblies are mounted on the frame using suspension systems. Unibody structures integrate components such as the front end, side panels, rear section, floor pan, engine, front/rear suspensions, and part of the transmission system directly onto the body, with body loads transmitted to wheels through suspension systems.

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