What is the difference between monocoque and body-on-frame vehicle structures?

[VonNolan]

The differences between monocoque and body-on-frame vehicle structures are as follows: 1. The core component of a body-on-frame structure is called the chassis frame. The frame is typically composed of two longitudinal beams and several cross beams that run through the entire body, providing high strength and torsional resistance. (1) Advantages: The frame absorbs some engine vibrations and road shocks, reducing interior noise and protecting the vehicle body. (2) Disadvantages: The frame is heavy and positioned high, raising the vehicle's center of gravity, which decreases stability at high speeds. The substantial weight of the frame increases the vehicle's overall weight, leading to higher fuel consumption. 2. The monocoque body structure features an integrated design without a separate frame. (1) Advantages: Vehicles with monocoque structures are lighter, have a lower center of gravity, offer smoother driving, and better fuel efficiency. (2) Disadvantages: Without a frame, when driving on rough roads with uneven wheel forces, the body is more prone to deformation.