Vehicle Seat Cushion Side Frame Rupture Prevention
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Solution Overview
Problem
Conventional vehicle seats are prone to rupture at the specific fixed portion during rear-end collisions, and attempts to mitigate this often result in increased weight due to larger through-holes or thicker materials.
Innovation Solution
The vehicle seat design features a through-hole in the cushion side frame with a flare outer diameter rod that allows the frame to rotate freely, distributing the load and preventing concentration, thereby reducing rupture risk while maintaining a lightweight structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smaller through-hole is provided in the cushion side frame to increase width from the lower end to the through-hole, then rupture of the cushion side frame is reduced, but the weight of the vehicle seat increases
Solution Approach 1:
The cushion side frame is designed to rotate freely about the rod rather than being fixed, allowing dynamic movement during rear-end collisions. This rotation capability enables the contact area to bear loads broadly without creating stress concentration points, thereby preventing rupture while maintaining a lightweight structure with standard through-hole dimensions
Solution Approach 2:
The invention changes the functional parameter of the rod from a fixed support to a rotational axis by providing a flare outer diameter that prevents the cushion side frame from falling off while allowing free rotation. This parameter change enables the system to achieve both lightweight construction and rupture resistance without modifying the through-hole size
Data Source
AI summary
A vehicle seat comprises a seat cushion, seatback, a cushion side frame, a rod, a seat supporting member, and a coupling bracket. A portion of the cushion side frame and a portion of the coupling bracket are overlapped such that the cushion side frame is located outside the coupling bracket. The cushion side frame and the coupling bracket comprise a through-hole that extends along a seat-width axis through the overlapped portion of the cushion side frame and the coupling bracket. The rod is inserted into the through-hole and has a flare outer diameter outside the cushion side frame that is larger than the diameter of the through-hole in the cushion side frame.